1描述问题 我在做一个简单的练习项目，要学习掌握socket的基本用法。 我的问题出现在demo（客户端）的java文件里，虽然我按照老师的讲解写了代码， //socket("IP地址"，端口号); Socket s=new Socket("192.168.43.224",8888); 但是程序出现了异常 2贴上相关代码 ``` public static void main(String[] args) throws Exception { Socket s=new Socket("192.168.43.224",8888); while (true){ System.out.println("请选择操作"); System.out.println("1增加2删除3更改4查询5退出"); Scanner sc=new Scanner(System.in); int choose=sc.nextInt(); switch (choose){ case 1: add(s); break; case 2:break; case 3:break; case 4:break; case 5:s.close();return; } } } ``` 3报错信息 Exception in thread "main" java.net.ConnectException: Connection refused: connect at java.base/java.net.PlainSocketImpl.connect0(Native Method) at java.base/java.net.PlainSocketImpl.socketConnect(PlainSocketImpl.java:101) at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399) at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:242) at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:224) at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:403) at java.base/java.net.Socket.connect(Socket.java:591) at java.base/java.net.Socket.connect(Socket.java:540) at java.base/java.net.Socket.<init>(Socket.java:436) at java.base/java.net.Socket.<init>(Socket.java:213) at homework.itheima.client.Demo.main(Demo.java:11) 4尝试过的方法 搜索了“java.net.ConnectException: Connection refused: connect”，但是 还是无从下手 5相关截图   

昨天遇到了这个错，到现在没解决，求大佬帮助 1.服务器安装了一个8082的项目，网页访问服务器ip:8082没有任何问题 2.本地装了个node，启动了一个前端项目 localhost:3000,后端接口配的就是http://服务器ip:8082 然后本地掉服务器接口就一直报 java.net.ConnectException: Connection refused: connect， 3.前端是通过jsonp掉的接口 之前都是好的，请问怎么解决啊 spring boot 项目 服务器windows的，防火墙是关闭的，端口也没占用 错误信息 ``` java.net.ConnectException: Connection refused: connect at java.net.DualStackPlainSocketImpl.connect0(Native Method) at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at java.net.Socket.connect(Socket.java:538) at sun.net.NetworkClient.doConnect(NetworkClient.java:180) at sun.net.www.http.HttpClient.openServer(HttpClient.java:432) at sun.net.www.http.HttpClient.openServer(HttpClient.java:527) at sun.net.www.http.HttpClient.<init>(HttpClient.java:211) at sun.net.www.http.HttpClient.New(HttpClient.java:308) at sun.net.www.http.HttpClient.New(HttpClient.java:326) at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1167) at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1103) at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:997) at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:931) at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1281) at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1256) at com.sunline.utils.HttpUtil.httpRequest(HttpUtil.java:62) at com.sunline.utils.HttpUtil.httpRequest(HttpUtil.java:30) at com.sunline.web.controller.XlrLoginController.oauthLogin(XlrLoginController.java:134) at sun.reflect.GeneratedMethodAccessor66.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:877) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:783) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866) at javax.servlet.http.HttpServlet.service(HttpServlet.java:687) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:158) at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:126) at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:111) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:90) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:209) at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178) at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:357) at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:270) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:613) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745) ```

org.apache.commons.httpclient.HttpClient请求页面，在windows上是好的，但是在linux上始终报错误:java.net.ConnectException: Connection refused。 而且，在linux上，用java原生的Http Connection可以请求到数据，用curl也可以请求到数据。 问题新进展： 之前，是通过new HttpClient(new HttpClientParams(), new MultiThreadedHttpConnectionManager());构造HttpClient的；现在改为new HttpClient(new HttpClientParams());就没问题了。MultiThreadedHttpConnectionManager为什么会导致Connection refused呢?

javase初学者一名，在看到head first java的网络联机这一节中遇到了问题。 用eclipse测试该语句时报错： java.net.ConnectException: Connection refused: connect ``` Socket s=new Socket("127.0.0.1",5000); ``` 搜索了一些处理 java.net.ConnectException: Connection refused: connect的方法，大多都是说Tomcat的问题，刚刚接触java不久对这些javaweb的东西一无所知，看了一部分帖子后，我猜测可能是我没有Tomcat的原因，我尝试了下在eclipse上装了server，并且载入了Tomcat，但是启动服务器失败了。 所以我想问这里的 ``` Socket s=new Socket("127.0.0.1",5000); ``` 到底是什么原因导致了connection refused。是否是因为与网络相关就必须要载入服务器，还是别的原因。《head frist java》并没有说需要载入服务器，Tomcat什么的操作。 以下是错误提示  程序代码 ``` import java.io.*; import java.net.*; public class DailyAdviceClient { public void go () { try { Socket s=new Socket("127.0.0.1",5000); InputStreamReader streamReader=new InputStreamReader(s.getInputStream()); BufferedReader reader=new BufferedReader(streamReader); String advice=reader.readLine(); System.out.println("Today you should "+advice); }catch(IOException ex) { ex.printStackTrace(); } } public static void main(String[] args) { DailyAdviceClient client =new DailyAdviceClient(); client.go(); } } ```

[code="java"] String name = "Compute"; HelloWorldCompute engine = new HelloWorldEngine(); HelloWorldCompute stub = (HelloWorldCompute) UnicastRemoteObject.exportObject(engine, 8888); Registry registry = LocateRegistry.getRegistry(); registry.rebind(name, stub);[/code] 执行最后一句，抛出异常 java.rmi.ConnectException: Connection refused to host: 10.200.1.184; nested exception is: java.net.ConnectException: Connection refused: connect 什么原因啊

## 这个服务昨晚还可以运行的，今早启动后， 一开始提示：could not be registered. A bean with that name has already been 根据网友的说法，我设置了：_allow-bean-definition-overriding: true _ ## 然后就开始报这个错了，现在把上面这个配置注释掉也不行。。。 请大神指教！ +++  +++ ``` com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused: connect at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:187) ~[jersey-apache-client4-1.19.1.jar:1.19.1] at com.sun.jersey.api.client.filter.GZIPContentEncodingFilter.handle(GZIPContentEncodingFilter.java:123) ~[jersey-client-1.19.1.jar:1.19.1] at com.netflix.discovery.EurekaIdentityHeaderFilter.handle(EurekaIdentityHeaderFilter.java:27) ~[eureka-client-1.9.13.jar:1.9.13] at com.sun.jersey.api.client.Client.handle(Client.java:652) ~[jersey-client-1.19.1.jar:1.19.1] at com.sun.jersey.api.client.WebResource.handle(WebResource.java:682) ~[jersey-client-1.19.1.jar:1.19.1] at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74) ~[jersey-client-1.19.1.jar:1.19.1] at com.sun.jersey.api.client.WebResource$Builder.get(WebResource.java:509) ~[jersey-client-1.19.1.jar:1.19.1] at com.netflix.discovery.shared.transport.jersey.AbstractJerseyEurekaHttpClient.getApplicationsInternal(AbstractJerseyEurekaHttpClient.java:194) ~[eureka-client-1.9.13.jar:1.9.13] at com.netflix.discovery.shared.transport.jersey.AbstractJerseyEurekaHttpClient.getApplications(AbstractJerseyEurekaHttpClient.java:165) ~[eureka-client-1.9.13.jar:1.9.13] at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) [eureka-client-1.9.13.jar:1.9.13] at com.netflix.discovery.shared.transport.decorator.MetricsCollectingEurekaHttpClient.execute(MetricsCollectingEurekaHttpClient.java:73) ~[eureka-client-1.9.13.jar:1.9.13] at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) [eureka-client-1.9.13.jar:1.9.13] at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) [eureka-client-1.9.13.jar:1.9.13] at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.executeOnNewServer(RedirectingEurekaHttpClient.java:118) ~[eureka-client-1.9.13.jar:1.9.13] at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.execute(RedirectingEurekaHttpClient.java:79) ~[eureka-client-1.9.13.jar:1.9.13] at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) [eureka-client-1.9.13.jar:1.9.13] at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) [eureka-client-1.9.13.jar:1.9.13] at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:120) [eureka-client-1.9.13.jar:1.9.13] at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) [eureka-client-1.9.13.jar:1.9.13] at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) [eureka-client-1.9.13.jar:1.9.13] at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) [eureka-client-1.9.13.jar:1.9.13] at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) [eureka-client-1.9.13.jar:1.9.13] at com.netflix.discovery.DiscoveryClient.getAndStoreFullRegistry(DiscoveryClient.java:1069) [eureka-client-1.9.13.jar:1.9.13] at com.netflix.discovery.DiscoveryClient.fetchRegistry(DiscoveryClient.java:983) [eureka-client-1.9.13.jar:1.9.13] at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:430) [eureka-client-1.9.13.jar:1.9.13] at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:276) [eureka-client-1.9.13.jar:1.9.13] at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:272) [eureka-client-1.9.13.jar:1.9.13] at org.springframework.cloud.netflix.eureka.CloudEurekaClient.<init>(CloudEurekaClient.java:67) [spring-cloud-netflix-eureka-client-2.1.4.RELEASE.jar:2.1.4.RELEASE] at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration.eurekaClient(EurekaClientAutoConfiguration.java:322) [spring-cloud-netflix-eureka-client-2.1.4.RELEASE.jar:2.1.4.RELEASE] at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration$$EnhancerBySpringCGLIB$$fdd1bb83.CGLIB$eurekaClient$2(<generated>) [spring-cloud-netflix-eureka-client-2.1.4.RELEASE.jar:2.1.4.RELEASE] at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration$$EnhancerBySpringCGLIB$$fdd1bb83$$FastClassBySpringCGLIB$$45c98188.invoke(<generated>) [spring-cloud-netflix-eureka-client-2.1.4.RELEASE.jar:2.1.4.RELEASE] at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244) [spring-core-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363) [spring-context-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration$$EnhancerBySpringCGLIB$$fdd1bb83.eurekaClient(<generated>) [spring-cloud-netflix-eureka-client-2.1.4.RELEASE.jar:2.1.4.RELEASE] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181] at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_181] at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) [spring-beans-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:622) [spring-beans-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:607) [spring-beans-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1321) [spring-beans-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1160) [spring-beans-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) [spring-beans-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) [spring-beans-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$1(AbstractBeanFactory.java:356) [spring-beans-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.cloud.context.scope.GenericScope$BeanLifecycleWrapper.getBean(GenericScope.java:389) ~[spring-cloud-context-2.1.4.RELEASE.jar:2.1.4.RELEASE] at org.springframework.cloud.context.scope.GenericScope.get(GenericScope.java:186) ~[spring-cloud-context-2.1.4.RELEASE.jar:2.1.4.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:353) [spring-beans-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) [spring-beans-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.aop.target.SimpleBeanTargetSource.getTarget(SimpleBeanTargetSource.java:35) ~[spring-aop-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaRegistration.getTargetObject(EurekaRegistration.java:129) ~[spring-cloud-netflix-eureka-client-2.1.4.RELEASE.jar:2.1.4.RELEASE] at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaRegistration.getEurekaClient(EurekaRegistration.java:117) ~[spring-cloud-netflix-eureka-client-2.1.4.RELEASE.jar:2.1.4.RELEASE] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181] at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_181] at org.springframework.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:282) ~[spring-core-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.cloud.context.scope.GenericScope$LockedScopedProxyFactoryBean.invoke(GenericScope.java:499) ~[spring-cloud-context-2.1.4.RELEASE.jar:2.1.4.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689) ~[spring-aop-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaRegistration$$EnhancerBySpringCGLIB$$ea0a2add.getEurekaClient(<generated>) ~[spring-cloud-netflix-eureka-client-2.1.4.RELEASE.jar:2.1.4.RELEASE] at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaServiceRegistry.maybeInitializeClient(EurekaServiceRegistry.java:57) ~[spring-cloud-netflix-eureka-client-2.1.4.RELEASE.jar:2.1.4.RELEASE] at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaServiceRegistry.register(EurekaServiceRegistry.java:38) ~[spring-cloud-netflix-eureka-client-2.1.4.RELEASE.jar:2.1.4.RELEASE] at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaAutoServiceRegistration.start(EurekaAutoServiceRegistration.java:83) ~[spring-cloud-netflix-eureka-client-2.1.4.RELEASE.jar:2.1.4.RELEASE] at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:182) ~[spring-context-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:53) ~[spring-context-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:360) ~[spring-context-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:158) ~[spring-context-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:122) ~[spring-context-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:893) ~[spring-context-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:162) ~[spring-boot-2.1.10.RELEASE.jar:2.1.10.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:552) ~[spring-context-5.1.11.RELEASE.jar:5.1.11.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.1.10.RELEASE.jar:2.1.10.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:744) ~[spring-boot-2.1.10.RELEASE.jar:2.1.10.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:391) ~[spring-boot-2.1.10.RELEASE.jar:2.1.10.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:312) ~[spring-boot-2.1.10.RELEASE.jar:2.1.10.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) ~[spring-boot-2.1.10.RELEASE.jar:2.1.10.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1204) ~[spring-boot-2.1.10.RELEASE.jar:2.1.10.RELEASE] at com.myfeign.MyFeignConsumer_8888.main(MyFeignConsumer_8888.java:14) ~[classes/:na] Caused by: java.net.ConnectException: Connection refused: connect at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_181] at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) ~[na:1.8.0_181] at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_181] at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_181] at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_181] at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_181] at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_181] at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_181] at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:117) ~[httpclient-4.5.1.jar:4.5.1] at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:177) ~[httpclient-4.5.1.jar:4.5.1] at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:144) ~[httpclient-4.5.1.jar:4.5.1] at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:131) ~[httpclient-4.5.1.jar:4.5.1] at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:611) ~[httpclient-4.5.1.jar:4.5.1] at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:446) ~[httpclient-4.5.1.jar:4.5.1] at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:882) ~[httpclient-4.5.1.jar:4.5.1] at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:117) ~[httpclient-4.5.1.jar:4.5.1] at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:55) ~[httpclient-4.5.1.jar:4.5.1] at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:173) ~[jersey-apache-client4-1.19.1.jar:1.19.1] ... 79 common frames omitted ```

<div class="iteye-blog-content-contain" style="font-size: 14px;"> <p>java  网络编程</p> <p> </p> <p>我执行一个非常简单的socket程序都出错！要崩溃了！我关闭了防火墙也不行，试了Ping 127.0.0.1是可以的，而且我查了这个端口也没有被占用，怎么解决？</p> <p>java.net.ConnectException: Connection refused: connect</p> <p>at java.net.DualStackPlainSocketImpl.connect0(Native Method)</p> <p>at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)</p> <p>at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)</p> <p>at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)</p> <p>at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)</p> <p>at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)</p> <p>at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)</p> <p>at java.net.Socket.connect(Socket.java:579)</p> <p>at java.net.Socket.connect(Socket.java:528)</p> <p>at java.net.Socket.&lt;init&gt;(Socket.java:425)</p> <p>at java.net.Socket.&lt;init&gt;(Socket.java:208)</p> <p>at com.hxw.socket.SimpleSocketClient.main(SimpleSocketClient.java:22)</p> <p>java.lang.NullPointerException</p> <p>at com.hxw.socket.SimpleSocketClient.main(SimpleSocketClient.java:37)</p> <p> </p> <p><span style="font-size: 24px;">源码在此：</span></p> <pre name="code" class="java">package com.hxw.socket; import java.io.*; import java.net.*; /** * 简单的Socket客户端 功能为：发送字符串“Hello”到服务器端，并打印出服务器端的反馈 */ public class SimpleSocketClient { public static void main(String[] args) { Socket socket = null; InputStream is = null; OutputStream os = null; // 服务器端IP地址 String serverIP = "127.0.0.1"; // 服务器端端口号 int port = 10002; // 发送内容 String data = "Hello"; try { // 建立连接 socket = new Socket(serverIP, port); // 发送数据 os = socket.getOutputStream(); os.write(data.getBytes()); // 接收数据 is = socket.getInputStream(); byte[] b = new byte[1024]; int n = is.read(b); // 输出反馈数据 System.out.println("服务器反馈：" + new String(b, 0, n)); } catch (Exception e) { e.printStackTrace(); // 打印异常信息 } finally { try { // 关闭流和连接 is.close(); os.close(); socket.close(); } catch (Exception e2) { e2.printStackTrace(); } } } } </pre> <p> </p> </div>

求助大佬：Windows的ideamysql8.0以上版本连接测试报错：java.net.ConnectException: Connection timed out: connect. mysql数据库已经启动，用户名密码均正确，时区已经更改为UTC，但是最后测试连接会报错。 报错截图：  数据库端口占用情况：  代码：  求助大佬，请问如何解决？？

报错详细信息： ``` 2019-10-16 17:32:09.395 INFO [cloud-agr-service,,,] 17972 --- [erListUpdater-0] c.netflix.config.ChainedDynamicProperty : Flipping property: gateway-zuul.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647 2019-10-16 17:32:12.545 ERROR [cloud-agr-service,124633d2ab2910a8,ee13ca3fab5a335a,false] 17972 --- [o-auto-1-exec-5] o.s.c.s.i.web.ExceptionLoggingFilter : Uncaught exception thrown org.springframework.web.util.NestedServletException: Request processing failed; nested exception is feign.RetryableException: connect: Address is invalid on local machine, or port is not valid on remote machine executing GET http://cloud-landmark/category/findOneAll at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982) ~[spring-webmvc-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866) ~[spring-webmvc-5.0.8.RELEASE.jar:5.0.8.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:687) ~[javax.servlet-api-3.1.0.jar:3.1.0] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851) ~[spring-webmvc-5.0.8.RELEASE.jar:5.0.8.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) ~[javax.servlet-api-3.1.0.jar:3.1.0] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.32.jar:8.5.32] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:90) ~[spring-boot-actuator-2.0.4.RELEASE.jar:2.0.4.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilterInternal(BasicAuthenticationFilter.java:158) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationProcessingFilter.doFilter(OAuth2AuthenticationProcessingFilter.java:176) ~[spring-security-oauth2-2.2.1.RELEASE.jar:na] at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:66) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178) ~[spring-security-web-5.0.7.RELEASE.jar:5.0.7.RELEASE] at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:357) ~[spring-web-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:270) ~[spring-web-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) ~[spring-web-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.springframework.cloud.sleuth.instrument.web.ExceptionLoggingFilter.doFilter(ExceptionLoggingFilter.java:48) ~[spring-cloud-sleuth-core-2.0.0.RELEASE.jar:2.0.0.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.32.jar:8.5.32] at brave.servlet.TracingFilter.doFilter(TracingFilter.java:86) [brave-instrumentation-servlet-5.1.0.jar:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:155) [spring-boot-actuator-2.0.4.RELEASE.jar:2.0.4.RELEASE] at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:123) [spring-boot-actuator-2.0.4.RELEASE.jar:2.0.4.RELEASE] at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:108) [spring-boot-actuator-2.0.4.RELEASE.jar:2.0.4.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) [spring-web-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:800) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1471) [tomcat-embed-core-8.5.32.jar:8.5.32] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.32.jar:8.5.32] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_131] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.32.jar:8.5.32] at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131] Caused by: feign.RetryableException: connect: Address is invalid on local machine, or port is not valid on remote machine executing GET http://cloud-landmark/category/findOneAll at feign.FeignException.errorExecuting(FeignException.java:67) ~[feign-core-9.5.1.jar:na] at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:104) ~[feign-core-9.5.1.jar:na] at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:76) ~[feign-core-9.5.1.jar:na] at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:103) ~[feign-core-9.5.1.jar:na] at com.sun.proxy.$Proxy201.findOneAll(Unknown Source) ~[na:na] at com.cloud.agr.service.controller.LandmarkController.findOneAll(LandmarkController.java:944) ~[classes/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_131] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_131] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_131] at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_131] at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209) ~[spring-web-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) ~[spring-web-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) ~[spring-webmvc-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:877) ~[spring-webmvc-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:783) ~[spring-webmvc-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991) ~[spring-webmvc-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925) ~[spring-webmvc-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974) ~[spring-webmvc-5.0.8.RELEASE.jar:5.0.8.RELEASE] ... 88 common frames omitted Caused by: java.net.ConnectException: connect: Address is invalid on local machine, or port is not valid on remote machine at java.net.DualStackPlainSocketImpl.connect0(Native Method) ~[na:1.8.0_131] at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:83) ~[na:1.8.0_131] at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_131] at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_131] at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_131] at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_131] at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_131] at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_131] at sun.net.NetworkClient.doConnect(NetworkClient.java:175) ~[na:1.8.0_131] at sun.net.www.http.HttpClient.openServer(HttpClient.java:463) ~[na:1.8.0_131] at sun.net.www.http.HttpClient.openServer(HttpClient.java:558) ~[na:1.8.0_131] at sun.net.www.http.HttpClient.<init>(HttpClient.java:242) ~[na:1.8.0_131] at sun.net.www.http.HttpClient.New(HttpClient.java:339) ~[na:1.8.0_131] at sun.net.www.http.HttpClient.New(HttpClient.java:357) ~[na:1.8.0_131] at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1202) ~[na:1.8.0_131] at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1138) ~[na:1.8.0_131] at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1032) ~[na:1.8.0_131] at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:966) ~[na:1.8.0_131] at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1546) ~[na:1.8.0_131] at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474) ~[na:1.8.0_131] at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480) ~[na:1.8.0_131] at feign.Client$Default.convertResponse(Client.java:152) ~[feign-core-9.5.1.jar:na] at feign.Client$Default.execute(Client.java:74) ~[feign-core-9.5.1.jar:na] at org.springframework.cloud.sleuth.instrument.web.client.feign.TracingFeignClient.execute(TracingFeignClient.java:91) ~[spring-cloud-sleuth-core-2.0.0.RELEASE.jar:2.0.0.RELEASE] at org.springframework.cloud.sleuth.instrument.web.client.feign.LazyTracingFeignClient.execute(LazyTracingFeignClient.java:55) ~[spring-cloud-sleuth-core-2.0.0.RELEASE.jar:2.0.0.RELEASE] at org.springframework.cloud.openfeign.ribbon.RetryableFeignLoadBalancer$1.doWithRetry(RetryableFeignLoadBalancer.java:103) ~[spring-cloud-openfeign-core-2.0.0.RELEASE.jar:2.0.0.RELEASE] at org.springframework.cloud.openfeign.ribbon.RetryableFeignLoadBalancer$1.doWithRetry(RetryableFeignLoadBalancer.java:88) ~[spring-cloud-openfeign-core-2.0.0.RELEASE.jar:2.0.0.RELEASE] at org.springframework.retry.support.RetryTemplate.doExecute(RetryTemplate.java:287) ~[spring-retry-1.2.2.RELEASE.jar:na] at org.springframework.retry.support.RetryTemplate.execute(RetryTemplate.java:180) ~[spring-retry-1.2.2.RELEASE.jar:na] at org.springframework.cloud.openfeign.ribbon.RetryableFeignLoadBalancer.execute(RetryableFeignLoadBalancer.java:88) ~[spring-cloud-openfeign-core-2.0.0.RELEASE.jar:2.0.0.RELEASE] at org.springframework.cloud.openfeign.ribbon.RetryableFeignLoadBalancer.execute(RetryableFeignLoadBalancer.java:54) ~[spring-cloud-openfeign-core-2.0.0.RELEASE.jar:2.0.0.RELEASE] at com.netflix.client.AbstractLoadBalancerAwareClient$1.call(AbstractLoadBalancerAwareClient.java:104) ~[ribbon-loadbalancer-2.2.5.jar:2.2.5] at com.netflix.loadbalancer.reactive.LoadBalancerCommand$3$1.call(LoadBalancerCommand.java:303) ~[ribbon-loadbalancer-2.2.5.jar:2.2.5] at com.netflix.loadbalancer.reactive.LoadBalancerCommand$3$1.call(LoadBalancerCommand.java:287) ~[ribbon-loadbalancer-2.2.5.jar:2.2.5] at rx.internal.util.ScalarSynchronousObservable$3.call(ScalarSynchronousObservable.java:231) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.util.ScalarSynchronousObservable$3.call(ScalarSynchronousObservable.java:228) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeConcatMap$ConcatMapSubscriber.drain(OnSubscribeConcatMap.java:286) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeConcatMap$ConcatMapSubscriber.onNext(OnSubscribeConcatMap.java:144) ~[rxjava-1.3.8.jar:1.3.8] at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:185) ~[ribbon-loadbalancer-2.2.5.jar:2.2.5] at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:180) ~[ribbon-loadbalancer-2.2.5.jar:2.2.5] at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:94) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:42) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber$1.call(OperatorRetryWithPredicate.java:127) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.enqueue(TrampolineScheduler.java:73) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.schedule(TrampolineScheduler.java:52) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:79) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:45) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.util.ScalarSynchronousObservable$WeakSingleProducer.request(ScalarSynchronousObservable.java:276) ~[rxjava-1.3.8.jar:1.3.8] at rx.Subscriber.setProducer(Subscriber.java:209) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:138) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:129) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.3.8.jar:1.3.8] at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.subscribe(Observable.java:10423) ~[rxjava-1.3.8.jar:1.3.8] at rx.Observable.subscribe(Observable.java:10390) ~[rxjava-1.3.8.jar:1.3.8] at rx.observables.BlockingObservable.blockForSingle(BlockingObservable.java:443) ~[rxjava-1.3.8.jar:1.3.8] at rx.observables.BlockingObservable.single(BlockingObservable.java:340) ~[rxjava-1.3.8.jar:1.3.8] at com.netflix.client.AbstractLoadBalancerAwareClient.executeWithLoadBalancer(AbstractLoadBalancerAwareClient.java:112) ~[ribbon-loadbalancer-2.2.5.jar:2.2.5] at org.springframework.cloud.openfeign.ribbon.LoadBalancerFeignClient.execute(LoadBalancerFeignClient.java:63) ~[spring-cloud-openfeign-core-2.0.0.RELEASE.jar:2.0.0.RELEASE] at org.springframework.cloud.sleuth.instrument.web.client.feign.TraceLoadBalancerFeignClient.execute(TraceLoadBalancerFeignClient.java:67) ~[spring-cloud-sleuth-core-2.0.0.RELEASE.jar:2.0.0.RELEASE] at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:97) ~[feign-core-9.5.1.jar:na] ... 105 common frames omitted ```

错误代码 java.net.SocketException: Connection reset at java.net.SocketInputStream.read(SocketInputStream.java:210) at java.net.SocketInputStream.read(SocketInputStream.java:141) at java.io.BufferedInputStream.fill(BufferedInputStream.java:246) at java.io.BufferedInputStream.read(BufferedInputStream.java:265) at org.apache.commons.httpclient.HttpParser.readRawLine(HttpParser.java:78) at org.apache.commons.httpclient.HttpParser.readLine(HttpParser.java:106) at org.apache.commons.httpclient.HttpConnection.readLine(HttpConnection.java:1116) at org.apache.commons.httpclient.HttpMethodBase.readStatusLine(HttpMethodBase.java:1973) at org.apache.commons.httpclient.HttpMethodBase.readResponse(HttpMethodBase.java:1735) at org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:1098) at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:398) at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171) at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397) at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323) at com.example.madame.service.JokeService.jokeGet(JokeService.java:86) at com.example.madame.controller.OneSentencePerDayController.test35(OneSentencePerDayController.java:105) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:892) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1039) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908) at javax.servlet.http.HttpServlet.service(HttpServlet.java:660) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:748) 我的代码 public String joke() { try { // String urlTypeName = java.net.URLEncoder.encode(city1, "utf-8"); URL url = new URL("xxx"); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(5000); conn.setRequestMethod("GET"); if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) { //结果码=200 InputStream is = conn.getInputStream(); //内存流 ， ByteArrayOutputStream boas = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int len = -1; while (is.available() != 0&&(len = is.read(buffer)) != -1) { boas.write(buffer, 0, len); } System.out.println("GET请求获取的数据:" + boas.toString()); JSONObject jsonObject = JSONObject.fromObject(boas.toString()); String reason = String.valueOf(jsonObject.get("reason")); if ("success".equals(reason)) { Object result = jsonObject.get("result"); JSONArray jsonArray = JSONArray.fromObject(result.toString()); int count = 0; String joke = ""; if (jsonArray.size() > 0) { for (int i = 0; i < jsonArray.size(); i++) { String content = String.valueOf(JSONObject.fromObject(jsonArray.get(i)).get("content")); count += 1; joke += " <tr align=\"center\" style=\"text-indent:2em;\">\n" + " <td >" + count + "." + content + "</td>\n" + " </tr>"; if (count == 3) { break; } } boas.close(); is.close(); return joke; } } } } catch (IOException e) { e.printStackTrace(); } return null; }

微信小程序获取个人标识用如图的参数(https://img-ask.csdn.net/upload/201812/05/1543998324_564696.png) 利用下图的方法 之前不报错 今天突然报错 求大神

java.net.ConnectException: Connection refused: connect.问题，求大神解救，跟着视频打的，但通用的方法运行失败 com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure Last packet sent to the server was 0 ms ago. at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at com.mysql.jdbc.Util.handleNewInstance(Util.java:406) at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074) at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2120) at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:723) at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at com.mysql.jdbc.Util.handleNewInstance(Util.java:406) at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:302) at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:282) at com.jdbc.JDBCtest.getConnection(JDBCtest.java:70) at com.jdbc.JDBCtest.testGetConnection(JDBCtest.java:77) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192) Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure Last packet sent to the server was 0 ms ago. at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at com.mysql.jdbc.Util.handleNewInstance(Util.java:406) at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074) at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:335) at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2043) ... 34 more Caused by: java.net.ConnectException: Connection refused: connect at java.net.DualStackPlainSocketImpl.connect0(Native Method) at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source) at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source) at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source) at java.net.AbstractPlainSocketImpl.connect(Unknown Source) at java.net.PlainSocketImpl.connect(Unknown Source) at java.net.SocksSocketImpl.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.<init>(Unknown Source) at java.net.Socket.<init>(Unknown Source) at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:253) at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:284) ... 35 more 源代码： package com.jdbc; import static org.junit.Assert.*; import java.io.InputStream; import java.sql.Connection; import java.sql.SQLException; import java.util.Properties; import org.junit.Test; import com.mysql.jdbc.Driver; public class JDBCtest { @Test public void testDriver() throws SQLException { //1.创建一个Driver实现类的对象 Driver driver = new com.mysql.jdbc.Driver(); //2.准备连接数据库的基本信息：url，user，password String url = "jdbc:mysql://localhost:3306/test"; //jdbc:子协议：//数据库所在的主机ip：端口号/数据库名 Properties info = new Properties(); info.put("user", "root"); info.put("password", "1230"); //3.调用Driver接口的connection（url，info）获取数据库资源 Connection connection = driver.connect(url, info); System.out.println(connection); } /** * 编写一个通用的方法，在不修改源程序的情况下，可以获取任何数据库的连接 * 解决方案：把数据库驱动Driver实现类的全类名、url、user、password放入一个 * 配置文件中，通过修改配置文件的方式实现和具体数据库解耦。 * @throws Exception */ public Connection getConnection() throws Exception{ String driverClass = null; String jdbcUrl = null; String user = null; String password = null; //读取类路径下的jdbc.properties文件 //输入流 InputStream in = getClass().getClassLoader().getResourceAsStream("jdbc.properties"); Properties properties = new Properties(); properties.load(in); driverClass = properties.getProperty("driver"); jdbcUrl = properties.getProperty("jdbcUrl"); user = properties.getProperty("user"); password = properties.getProperty("password"); Driver driver = (Driver) Class.forName(driverClass).newInstance(); Properties info = new Properties(); info.put("user",user); info.put("password",password); Connection connection = driver.connect(jdbcUrl,info); return connection; } @Test public void testGetConnection() throws Exception{ System.out.println(getConnection()); } } jdbc.properties文件： driver=com.mysql.jdbc.Driver jdbcUrl=jdbc:mysql://localhost:3306/test user=root password=1230

``` org.apache.catalina.core.StandardWrapperValve invoke 严重: Servlet.service() for servlet [dispatcher] in context with path [/platform] threw exception [Filtered request failed.] with root cause java.net.ConnectException: Connection refused: connect at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at redis.clients.jedis.Connection.connect(Connection.java:184) at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:93) at redis.clients.jedis.BinaryJedis.connect(BinaryJedis.java:1767) at redis.clients.jedis.JedisFactory.makeObject(JedisFactory.java:106) at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:868) at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:458) at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:363) at redis.clients.util.Pool.getResource(Pool.java:49) at redis.clients.jedis.JedisPool.getResource(JedisPool.java:226) at redis.clients.jedis.JedisPool.getResource(JedisPool.java:16) at net.oschina.j2cache.redis.RedisPubSubClusterPolicy.publish(RedisPubSubClusterPolicy.java:146) at net.oschina.j2cache.redis.RedisPubSubClusterPolicy.connect(RedisPubSubClusterPolicy.java:102) at net.oschina.j2cache.cluster.ClusterPolicyFactory.redis(ClusterPolicyFactory.java:68) at net.oschina.j2cache.cluster.ClusterPolicyFactory.init(ClusterPolicyFactory.java:43) at net.oschina.j2cache.J2CacheBuilder.initFromConfig(J2CacheBuilder.java:119) at net.oschina.j2cache.J2CacheBuilder.getChannel(J2CacheBuilder.java:62) at net.oschina.j2cache.J2Cache.getChannel(J2Cache.java:44) at com.platform.cache.J2CacheUtils.<clinit>(J2CacheUtils.java:25) at com.platform.shiro.CluterShiroSessionDao.setShiroSession(CluterShiroSessionDao.java:57) at com.platform.shiro.CluterShiroSessionDao.doCreate(CluterShiroSessionDao.java:23) at org.apache.shiro.session.mgt.eis.AbstractSessionDAO.create(AbstractSessionDAO.java:116) at org.apache.shiro.session.mgt.eis.CachingSessionDAO.create(CachingSessionDAO.java:184) at org.apache.shiro.session.mgt.DefaultSessionManager.create(DefaultSessionManager.java:177) at org.apache.shiro.session.mgt.DefaultSessionManager.doCreateSession(DefaultSessionManager.java:158) at org.apache.shiro.session.mgt.AbstractValidatingSessionManager.createSession(AbstractValidatingSessionManager.java:136) at org.apache.shiro.session.mgt.AbstractNativeSessionManager.start(AbstractNativeSessionManager.java:99) at org.apache.shiro.mgt.SessionsSecurityManager.start(SessionsSecurityManager.java:152) at org.apache.shiro.subject.support.DelegatingSubject.getSession(DelegatingSubject.java:336) at org.apache.shiro.subject.support.DelegatingSubject.getSession(DelegatingSubject.java:312) at org.apache.shiro.web.util.WebUtils.saveRequest(WebUtils.java:607) at org.apache.shiro.web.filter.AccessControlFilter.saveRequest(AccessControlFilter.java:208) at org.apache.shiro.web.filter.AccessControlFilter.saveRequestAndRedirectToLogin(AccessControlFilter.java:191) at org.apache.shiro.web.filter.authc.FormAuthenticationFilter.onAccessDenied(FormAuthenticationFilter.java:168) at org.apache.shiro.web.filter.AccessControlFilter.onAccessDenied(AccessControlFilter.java:133) at org.apache.shiro.web.filter.AccessControlFilter.onPreHandle(AccessControlFilter.java:162) at org.apache.shiro.web.filter.PathMatchingFilter.isFilterChainContinued(PathMatchingFilter.java:203) at org.apache.shiro.web.filter.PathMatchingFilter.preHandle(PathMatchingFilter.java:178) at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:131) at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66) at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449) at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365) at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90) at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83) at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383) at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362) at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346) at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:748) org.apache.catalina.core.StandardWrapperValve invoke 严重: Servlet.service() for servlet [dispatcher] in context with path [/platform] threw exception [Filtered request failed.] with root cause java.lang.NoClassDefFoundError: Could not initialize class com.platform.cache.J2CacheUtils at com.platform.shiro.CluterShiroSessionDao.setShiroSession(CluterShiroSessionDao.java:57) at com.platform.shiro.CluterShiroSessionDao.doCreate(CluterShiroSessionDao.java:23) at org.apache.shiro.session.mgt.eis.AbstractSessionDAO.create(AbstractSessionDAO.java:116) at org.apache.shiro.session.mgt.eis.CachingSessionDAO.create(CachingSessionDAO.java:184) at org.apache.shiro.session.mgt.DefaultSessionManager.create(DefaultSessionManager.java:177) at org.apache.shiro.session.mgt.DefaultSessionManager.doCreateSession(DefaultSessionManager.java:158) at org.apache.shiro.session.mgt.AbstractValidatingSessionManager.createSession(AbstractValidatingSessionManager.java:136) at org.apache.shiro.session.mgt.AbstractNativeSessionManager.start(AbstractNativeSessionManager.java:99) at org.apache.shiro.mgt.SessionsSecurityManager.start(SessionsSecurityManager.java:152) at org.apache.shiro.subject.support.DelegatingSubject.getSession(DelegatingSubject.java:336) at org.apache.shiro.subject.support.DelegatingSubject.getSession(DelegatingSubject.java:312) at org.apache.shiro.web.util.WebUtils.saveRequest(WebUtils.java:607) at org.apache.shiro.web.filter.AccessControlFilter.saveRequest(AccessControlFilter.java:208) at org.apache.shiro.web.filter.AccessControlFilter.saveRequestAndRedirectToLogin(AccessControlFilter.java:191) at org.apache.shiro.web.filter.authc.FormAuthenticationFilter.onAccessDenied(FormAuthenticationFilter.java:168) at org.apache.shiro.web.filter.AccessControlFilter.onAccessDenied(AccessControlFilter.java:133) at org.apache.shiro.web.filter.AccessControlFilter.onPreHandle(AccessControlFilter.java:162) at org.apache.shiro.web.filter.PathMatchingFilter.isFilterChainContinued(PathMatchingFilter.java:203) at org.apache.shiro.web.filter.PathMatchingFilter.preHandle(PathMatchingFilter.java:178) at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:131) at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66) at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449) at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365) at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90) at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83) at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383) at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362) at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346) at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:748) ```

我的tomcat.startup.bat后，客户端同时启动1000个以上线程去请求它时，开始运行会有 java.net.ConnectException: Connection refused: connect at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.PlainSocketImpl.doConnect(Unknown Source) at java.net.PlainSocketImpl.connectToAddress(Unknown Source) at java.net.PlainSocketImpl.connect(Unknown Source) at java.net.SocksSocketImpl.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.<init>(Unknown Source) at java.net.Socket.<init>(Unknown Source) 抛出，大家帮分析下是什么原因呢？ 我的server.xml中设置maxThreads="500" acceptCount="500"

我的调用方法： public static void main(String[] args) throws Exception { String client_id = "HeYiApp"; String orderNum = "2"; List numberList = new ArrayList(); numberList.add("120719"); numberList.add("120746"); numberList.add("113095"); String webUrl = "https://10.218.132.26/api/openapi/employee/getBatchEmpInfoList.json";// 服务端url地址 String webMethod = "getBatchEmpInfoList";// 调用方法名称 Service service = new Service(); // 建服务 Call call; try { call = (Call) service.createCall(); try { call.setTargetEndpointAddress(new URL(webUrl)); } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); }// 设置访问地址 call.setOperationName(webMethod);// 设置访问方法 call.addParameter("arg0", XMLType.XSD_STRING, javax.xml.rpc.ParameterMode.IN);// 定义参数 call.addParameter("arg1", XMLType.XSD_STRING, javax.xml.rpc.ParameterMode.IN);// 定义参数 call.addParameter("arg2", XMLType.XSD_STRING, javax.xml.rpc.ParameterMode.IN);// 定义参数 call.setReturnType(XMLType.XSD_STRING);// 定义返回值格式 //List<Map<String, Object>> workersInfo= (List<Map<String, Object>>) call.invoke(new Object[] { client_id, numberList, orderNum }); //for(Map m:workersInfo){ // System.out.println(m.get("name")); //} JSONArray jsonObject = (JSONArray) call.invoke(new Object[] { client_id, numberList, orderNum }); System.out.println(jsonObject.toString()); } catch (ServiceException e) { // TODO Auto-generated catch block e.printStackTrace(); } // 建对话 } 报错： Exception in thread "main" AxisFault faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server.userException faultSubcode: faultString: java.net.ConnectException: Connection refused: connect faultActor: faultNode: faultDetail: {http://xml.apache.org/axis/}stackTrace:java.net.ConnectException: Connection refused: connect at java.net.DualStackPlainSocketImpl.connect0(Native Method) at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:668) at sun.security.ssl.SSLSocketImpl.&lt;init&gt;(SSLSocketImpl.java:427) at sun.security.ssl.SSLSocketFactoryImpl.createSocket(SSLSocketFactoryImpl.java:88) at org.apache.axis.components.net.JSSESocketFactory.create(JSSESocketFactory.java:92) at org.apache.axis.transport.http.HTTPSender.getSocket(HTTPSender.java:191) at org.apache.axis.transport.http.HTTPSender.writeToSocket(HTTPSender.java:404) at org.apache.axis.transport.http.HTTPSender.invoke(HTTPSender.java:138) at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32) at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118) at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83) at org.apache.axis.client.AxisClient.invoke(AxisClient.java:165) at org.apache.axis.client.Call.invokeEngine(Call.java:2784) at org.apache.axis.client.Call.invoke(Call.java:2767) at org.apache.axis.client.Call.invoke(Call.java:2443) at org.apache.axis.client.Call.invoke(Call.java:2366) at org.apache.axis.client.Call.invoke(Call.java:1812) at webservice.Test.main(Test.java:52) {http://xml.apache.org/axis/}hostname:zhangxl java.net.ConnectException: Connection refused: connect at org.apache.axis.AxisFault.makeFault(AxisFault.java:101) at org.apache.axis.transport.http.HTTPSender.invoke(HTTPSender.java:154) at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32) at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118) at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83) at org.apache.axis.client.AxisClient.invoke(AxisClient.java:165) at org.apache.axis.client.Call.invokeEngine(Call.java:2784) at org.apache.axis.client.Call.invoke(Call.java:2767) at org.apache.axis.client.Call.invoke(Call.java:2443) at org.apache.axis.client.Call.invoke(Call.java:2366) at org.apache.axis.client.Call.invoke(Call.java:1812) at webservice.Test.main(Test.java:52) Caused by: java.net.ConnectException: Connection refused: connect at java.net.DualStackPlainSocketImpl.connect0(Native Method) at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:668) at sun.security.ssl.SSLSocketImpl.<init>(SSLSocketImpl.java:427) at sun.security.ssl.SSLSocketFactoryImpl.createSocket(SSLSocketFactoryImpl.java:88) at org.apache.axis.components.net.JSSESocketFactory.create(JSSESocketFactory.java:92) at org.apache.axis.transport.http.HTTPSender.getSocket(HTTPSender.java:191) at org.apache.axis.transport.http.HTTPSender.writeToSocket(HTTPSender.java:404) at org.apache.axis.transport.http.HTTPSender.invoke(HTTPSender.java:138) ... 10 more

CDH 集群安装kafka和spark2后重启后报错如下： 020-05-12 18:33:55,318 ERROR ParcelUpdateService:com.cloudera.parcel.components.ParcelDownloaderImpl: Unable to retrieve remote parcel repository manifest java.util.concurrent.ExecutionException: java.net.ConnectException: Connection refused to https://archive.cloudera.com/cdh5/parcels/5.16/manifest.json at com.ning.http.client.providers.netty.NettyResponseFuture.abort(NettyResponseFuture.java:297) at com.ning.http.client.providers.netty.NettyConnectListener.operationComplete(NettyConnectListener.java:104) at org.jboss.netty.channel.DefaultChannelFuture.notifyListener(DefaultChannelFuture.java:399) at org.jboss.netty.channel.DefaultChannelFuture.notifyListeners(DefaultChannelFuture.java:390) at org.jboss.netty.channel.DefaultChannelFuture.setFailure(DefaultChannelFuture.java:352) at org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.connect(NioClientSocketPipelineSink.java:409) at org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.processSelectedKeys(NioClientSocketPipelineSink.java:366) at org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.run(NioClientSocketPipelineSink.java:282) at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:102) at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Caused by: java.net.ConnectException: Connection refused to https://archive.cloudera.com/cdh5/parcels/5.16/manifest.json at com.ning.http.client.providers.netty.NettyConnectListener.operationComplete(NettyConnectListener.java:100) ... 11 more Caused by: java.net.ConnectException: Connection refused at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) at org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.connect(NioClientSocketPipelineSink.java:404) at org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.processSelectedKeys(NioClientSocketPipelineSink.java:366) at org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.run(NioClientSocketPipelineSink.java:282) ... 3 more 求大神指点

2009-10-21 15:31:04 org.apache.commons.httpclient.HttpMethodDirector executeWithRetry 信息: I/O exception (java.net.ConnectException) caught when processing request: Connection timed out: connect 2009-10-21 15:31:04 org.apache.commons.httpclient.HttpMethodDirector executeWithRetry 信息: Retrying request Exception in thread "main" java.net.ConnectException: Connection timed out: connect at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.PlainSocketImpl.doConnect(Unknown Source) at java.net.PlainSocketImpl.connectToAddress(Unknown Source) at java.net.PlainSocketImpl.connect(Unknown Source) at java.net.SocksSocketImpl.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.<init>(Unknown Source) at java.net.Socket.<init>(Unknown Source) at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:79) at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:121) at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:706) at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:386) at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:170) at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:396) at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:324) at com.icbc.SSL.SSLSendAndRec.main(SSLSendAndRec.java:57) [b]问题补充：[/b] client.getHostConfiguration().setProxy() 我设置了代理的

在k8s上面部署了fastdfs集群，在本地测试时报错java.net.SocketTimeoutException: connect timed out，因为是在k8s 上面部署的，所以很多解决办法没有用，想问一下大家有没有类似的问题或有没有人知道怎么解决的。 能够成功获取到TrackerServer ，StorageClient，并且配置文件中tracker_server为外网地址 ``` # 报错位置 storageClient.upload_file(byteFile, ext_file, null); ```

## java.net.ConnectException: Connection refused: connect**** at java.net.DualStackPlainSocketImpl.connect0(Native Method) at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at java.net.Socket.connect(Socket.java:538) at java.net.Socket.<init>(Socket.java:434) at java.net.Socket.<init>(Socket.java:211) at org.apache.catalina.startup.Catalina.stopServer(Catalina.java:476) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.catalina.startup.Bootstrap.stopServer(Bootstrap.java:408) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:497) 这个tomcat启动会报连接被拒绝是什么鬼，可是运行还是可以运行。

课程演示环境：Windows10; cuda 10.2; cudnn7.6.5; Python3.7; VisualStudio2019; OpenCV3.4 需要学习ubuntu系统上YOLOv4的同学请前往：《YOLOv4目标检测实战：训练自己的数据集》 课程链接：https://edu.csdn.net/course/detail/28745 YOLOv4来了！速度和精度双提升！ 与 YOLOv3 相比，新版本的 AP (精度)和 FPS （每秒帧率）分别提高了 10% 和 12%。 YOLO系列是基于深度学习的端到端实时目标检测方法。本课程将手把手地教大家使用labelImg标注和使用YOLOv4训练自己的数据集。课程实战分为两个项目：单目标检测（足球目标检测）和多目标检测（足球和梅西同时检测）。 本课程的YOLOv4使用AlexyAB/darknet，在Windows系统上做项目演示。包括：安装软件环境、安装YOLOv4、标注自己的数据集、整理自己的数据集、修改配置文件、训练自己的数据集、测试训练出的网络模型、性能统计(mAP计算)和先验框聚类分析。还将介绍改善YOLOv4目标检测性能的技巧。 除本课程《Windows版YOLOv4目标检测实战：训练自己的数据集》外，本人将推出有关YOLOv4目标检测的系列课程。请持续关注该系列的其它视频课程，包括： 《Windows版YOLOv4目标检测实战：人脸口罩佩戴检测》 《Windows版YOLOv4目标检测实战：中国交通标志识别》 《Windows版YOLOv4目标检测：原理与源码解析》

2019数学建模历年题目及优秀论文 ，好资源与大家分享！！

华为海思数字IC提前批笔试题目，2020届华为海思校园招聘，西南地区。单选和多选题华为海思数字IC提前批笔试题目，2020届华为海思校园招聘，西南地区。单选和多选题

文章目录Java概述何为编程什么是Javajdk1.5之后的三大版本JVM、JRE和JDK的关系什么是跨平台性？原理是什么Java语言有哪些特点什么是字节码？采用字节码的最大好处是什么什么是Java程序的主类？应用程序和小程序的主类有何不同？Java应用程序与小程序之间有那些差别？Java和C++的区别Oracle JDK 和 OpenJDK 的对比基础语法数据类型Java有哪些数据类型switc...

从事大数据与人工智能开发与实践约十年，钱老师亲自见证了大数据行业的发展与人工智能的从冷到热。事实证明，计算机技术的发展，算力突破，海量数据，机器人技术等，开启了第四次工业革命的序章。深度学习图像分类一直是人工智能的经典任务，是智慧零售、安防、无人驾驶等机器视觉应用领域的核心技术之一，掌握图像分类技术是机器视觉学习的重中之重。针对现有线上学习的特点与实际需求，我们开发了人工智能案例实战系列课程。打造：以项目案例实践为驱动的课程学习方式，覆盖了智能零售，智慧交通等常见领域，通过基础学习、项目案例实践、社群答疑，三维立体的方式，打造最好的学习效果。

本课程内容系统、全面、简洁、通俗易懂，通过2个多小时的介绍，让大家对软件测试有个系统的理解和认识，具备基本的软件测试理论基础。 主要内容分为5个部分： 1 软件测试概述，了解测试是什么、测试的对象、原则、流程、方法、模型；&nbsp; 2.常用的黑盒测试用例设计方法及示例演示；&nbsp; 3 常用白盒测试用例设计方法及示例演示；&nbsp; 4.自动化测试优缺点、使用范围及示例‘；&nbsp; 5.测试经验谈。

92讲视频课+16大项目实战+源码+￥800元课程礼包+讲师社群1V1答疑+社群闭门分享会=99元 &nbsp; 为什么学习数据分析？ &nbsp; &nbsp; &nbsp; 人工智能、大数据时代有什么技能是可以运用在各种行业的？数据分析就是。 &nbsp; &nbsp; &nbsp; 从海量数据中获得别人看不见的信息，创业者可以通过数据分析来优化产品，营销人员可以通过数据分析改进营销策略，产品经理可以通过数据分析洞察用户习惯，金融从业者可以通过数据分析规避投资风险，程序员可以通过数据分析进一步挖掘出数据价值，它和编程一样，本质上也是一个工具，通过数据来对现实事物进行分析和识别的能力。不管你从事什么行业，掌握了数据分析能力，往往在其岗位上更有竞争力。 &nbsp;&nbsp; 本课程共包含五大模块： 一、先导篇： 通过分析数据分析师的一天，让学员了解全面了解成为一个数据分析师的所有必修功法，对数据分析师不在迷惑。 &nbsp; 二、基础篇： 围绕Python基础语法介绍、数据预处理、数据可视化以及数据分析与挖掘......这些核心技能模块展开，帮助你快速而全面的掌握和了解成为一个数据分析师的所有必修功法。 &nbsp; 三、数据采集篇： 通过网络爬虫实战解决数据分析的必经之路：数据从何来的问题，讲解常见的爬虫套路并利用三大实战帮助学员扎实数据采集能力，避免没有数据可分析的尴尬。 &nbsp; 四、分析工具篇： 讲解数据分析避不开的科学计算库Numpy、数据分析工具Pandas及常见可视化工具Matplotlib。 &nbsp; 五、算法篇： 算法是数据分析的精华，课程精选10大算法，包括分类、聚类、预测3大类型，每个算法都从原理和案例两个角度学习，让你不仅能用起来，了解原理，还能知道为什么这么做。

本文十天后设置为粉丝可见，喜欢的提前关注 不要白嫖请点赞 不要白嫖请点赞 不要白嫖请点赞 文中提到的书我都有电子版，可以评论邮箱发给你。 文中提到的书我都有电子版，可以评论邮箱发给你。 文中提到的书我都有电子版，可以评论邮箱发给你。 本篇文章应该算是Java后端开发技术栈的，但是大部分是基础知识，所以我觉得对任何方向都是有用的。 1、数据结构 数据结构是计算机存储、...

整理的136道阿里的Java面试题，都来挑战一下，看看自己有多厉害。下面题目都带超详细的解答，详情见底部。 java基础 Arrays.sort实现原理和Collection实现原理 foreach和while的区别(编译之后) 线程池的种类，区别和使用场景 分析线程池的实现原理和线程的调度过程 线程池如何调优 线程池的最大线程数目根据什么确定 动态代理的几种方式 HashMap的并发问题 了解LinkedHashMap的应用吗 反射的原理，反射创建类实例的三种方式是什么？ clon

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2020第三届河北省研究生建模竞赛B题，利用lingo进行求解的代码。lingo在处理这类涉及下标的约束条件是个难点，希望我的代码能够提供一些帮助

怎么建表？ 根据需求建ER图 根据ER图和三范式建表 SQL structured query language 结构化查询语言 数据库执行语句 数据定义语言 (Data Definition Language, DDL) 是SQL语言集中负责数据结构定义与数据库对象定义的语言，由CREATE、ALTER与DROP三个语法所组成 数据控制语言（DCL：Data Control Language）是用来设置或者更改数据库用户或角色权限的语句，这些语句包括GRANT、REVOKE等语句 插入语句

文档位联发科公司的数字IC岗位笔试题，自己回忆版本，跟前一个A卷一起是完整版

课程分为两条主线： 1&nbsp;从Tensorflow的基础知识开始，全面介绍Tensorflow和Keras相关内容。通过大量实战，掌握Tensorflow和Keras经常用到的各种建模方式，参数优化方法，自定义参数和模型的手段，以及对训练结果评估与分析的技巧。 2&nbsp;从机器学习基础算法开始，然后进入到图像分类领域，使用MNIST手写数据集和CIFAR10图像数据集，从简单神经网络到深度神经网络，再到卷积神经网络，最终完成复杂模型：残差网络的搭建。完成这条主线，学员将可以自如地使用机器学习的手段来达到图像分类的目的。

【数据结构与算法】应该是大学计算机专业必修的一门课，为什么这门课会被列入到必修课的行列当中呢？因为对于每一个程序员来说，在以后的工作中不免要面对一些复杂的业务逻辑，同时要写对应的代码来实现这个复杂的业务。当然了，有很多种方式都可以实现同一个业务逻辑，但每种方式的代码运行效率可能不一样，我们接下来通过一个简单的例子感受一下。 例子： 假如你们班级里有一万个人，并且每个人的姓名和身份信息都存储在一个

后端需要知道的关于redis的事，基本都在这里了。 此文后续会改为粉丝可见，所以喜欢的请提前关注。 你的点赞和评论是我创作的最大动力，谢谢。 3、单机实现 3.1、数据库概述 redis服务器将所有数据库都保存在redis/redisServer中，数组db存放所有数据库，每一项是一个redisdb结构。dbnum代表数据库数量。 客户端有一个指针指向当前数据库，可以切换，也就是移动指

中国全国省地县乡村五级地标kmz（很准），我也不知道写啥了，反正挺好用的

本课程旨在帮助学习者快速入门R语言： 课程系统详细地介绍了使用R语言进行数据处理的基本思路和方法。 课程能够帮助初学者快速入门数据处理。 课程通过大量的案例详细地介绍了如何使用R语言进行数据分析和处理 课程操作实际案例教学，通过编写代码演示R语言的基本使用方法和技巧

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作者：JackTian、黄伟呢 公众号：杰哥的IT之旅，后台回复：「运维」可获取本文完整数据 大家好，我是 JackTian。 我经常会收到读者关于一系列咨询运维方面的事情，比如：杰哥，运维到底是做什么的呀？运维的薪资水平/ 待遇怎么样呢？杰哥帮忙看下这个岗位的招聘需要对于小白来说，能否胜任的了呢？等等。 这里，我把之前写的《一篇文章带你解读从初级运维工程师到资深运维专家的学习路线》，本文从初级 / 中级 / 高级运维工程师以及到资深方向逐步展开给大家汇总了一些各阶段所具备的技能，仅供学习路线参考，如有.

2018年数学建模国赛A题matlab代码及注释，自己做题编写，实测有效，可以运行

本套课程的设计完全是为初学者量身打造，课程内容由浅入深，课程讲解通俗易懂，代码实现简洁清晰。通过本课程的学习，学员能够入门微信公众平台开发，能够胜任企业级的订阅号、服务号、企业号的应用开发工作。 通过本课程的学习，学员能够对微信公众平台有一个清晰的、系统性的认识。例如，公众号是什么，它有什么特点，它能做什么，怎么开发公众号。 其次，通过本课程的学习，学员能够掌握微信公众平台开发的方法、技术和应用实现。例如，开发者文档怎么看，开发环境怎么搭建，基本的消息交互如何实现，常用的方法技巧有哪些，真实应用怎么开发。

3折秒杀！ 系统掌握Python核心语法16点，轻松应对工作中80%以上的Python使用场景！ 69元=72讲+源码+社群答疑+讲师社群分享会&nbsp; 【哪些人适合学习这门课程？】 1）大学生，平时只学习了Python理论，并未接触Python实战问题； 2）对Python实用技能掌握薄弱的人，自动化、爬虫、数据分析能让你快速提高工作效率； 3）想学习新技术，如：人工智能、机器学习、深度学习等，这门课程是你的必修课程； 4）想修炼更好的编程内功，优秀的工程师肯定不能只会一门语言，Python语言功能强大、使用高效、简单易学。 【超实用技能】 从零开始 自动生成工作周报 职场升级 豆瓣电影数据爬取 实用案例 奥运冠军数据分析 自动化办公：通过Python自动化分析Excel数据并自动操作Word文档，最终获得一份基于Excel表格的数据分析报告。 豆瓣电影爬虫：通过Python自动爬取豆瓣电影信息并将电影图片保存到本地。 奥运会数据分析实战 简介：通过Python分析120年间奥运会的数据，从不同角度入手分析，从而得出一些有趣的结论。 【超人气老师】 二两 中国人工智能协会高级会员 生成对抗神经网络研究者 《深入浅出生成对抗网络：原理剖析与TensorFlow实现》一书作者 阿里云大学云学院导师 前大型游戏公司后端工程师 【超丰富实用案例】 0）图片背景去除案例 1）自动生成工作周报案例 2）豆瓣电影数据爬取案例 3）奥运会数据分析案例 4）自动处理邮件案例 5）github信息爬取/更新提醒案例 6）B站百大UP信息爬取与分析案例 7）构建自己的论文网站案例

本系列课程将基于RedHat Linux 7.4版本、Hadoop 2.7.3、Spark 2 版本全面介绍大数据的整体内容，让学员深入理解并掌握运行机制和原理，从而进一步掌握大数据的相关内容。

Python+OpenCV计算机视觉系统全面的介绍。

文档为自己回忆 准确度高；2019年2020届笔试题；文档分上下两个章节，

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在linux下利用c语言实现的进程树的打印，主要通过/proc下的目录中的进程文件，获取status中的进程信息内容，然后利用递归实现进程树的打印