spring+springmvc+mybatis问题

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• spring+springmvc+mybatis问题

  5年前
  回答 2 已采纳 用spring+springmvc+mybatis做一个用户角色管理项目,2个实体类，user,role 数据库有3张表, user, role,relate(关联这俩个表的), 需要sql语句添加这俩个实体类的主键ID, 但是不建立relate的实体类, insert into s_relate (user_id,role_id) values(#{user_id,#{role_id}}) 1.是在建立一个.xml文件？还是直接才user 或 role 的.xml文件里写？ 2.我在user.xml文件里加上这个sql语句,启动报错。 3.如果在建立一个relate.xml文件应该放在哪？,还有里面的内容怎么写。 namespace ， resultMap是不是应该写一个user的，写一个role的？ 大神帮帮忙，新手, 无从下手。
• 求：myeclipse10+maven+webservice+springmvc+mybatis

  5年前
  回答 1 已采纳 最近公司要做个项目，要求使用webservice和maven，我们的开发工具是myeclipse， 那么问题来了，如何构建项目？webservice项目如何发布？
• Spring+SpringMVC+Mybatis dubbo整合 bean实例化失败 javamavenspringeclipsetomcat

  8月前
  回答 2 已采纳 1、问题描述： 严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.taotao.service.ItemService': Instantiation of bean failed; nested exception is java.lang.ExceptionInInitializerError 2、代码片段： ``` package com.taotao.service; import com.taotao.pojo.TbItem; public interface ItemService { TbItem getItemById(long id); } package com.taotao.service.impl; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.taotao.mapper.TbItemMapper; import com.taotao.pojo.TbItem; import com.taotao.service.ItemService; //@Service("itemService") @Service("ItemService") public class ItemServiceImpl implements ItemService { @Autowired private TbItemMapper itemMapper; @Override public TbItem getItemById(long id) { // TODO Auto-generated method stub TbItem item = itemMapper.selectByPrimaryKey(id); return item; } } ``` 3、项目预览：  4、异常全信息： ``` 9月 08, 2020 10:34:26 上午 org.apache.coyote.AbstractProtocol init 信息: Initializing ProtocolHandler ["http-bio-8080"] 9月 08, 2020 10:34:26 上午 org.apache.catalina.core.StandardService startInternal 信息: Starting service Tomcat 9月 08, 2020 10:34:26 上午 org.apache.catalina.core.StandardEngine startInternal 信息: Starting Servlet Engine: Apache Tomcat/7.0.47 9月 08, 2020 10:34:29 上午 org.apache.catalina.core.ApplicationContext log 信息: No Spring WebApplicationInitializer types detected on classpath 9月 08, 2020 10:34:29 上午 org.apache.catalina.core.ApplicationContext log 信息: Initializing Spring root WebApplicationContext log4j:WARN No appenders could be found for logger (org.springframework.web.context.ContextLoader). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info. 9月 08, 2020 10:34:30 上午 org.apache.catalina.core.StandardContext listenerStart 严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.taotao.service.ItemService': Instantiation of bean failed; nested exception is java.lang.ExceptionInInitializerError at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1105) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1050) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:446) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:328) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:830) Caused by: java.lang.ExceptionInInitializerError at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500) at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481) at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:147) at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1098) ... 22 more Caused by: java.lang.IllegalStateException: fail to create adaptive instance: java.lang.IllegalStateException: Can not create adaptive extenstion interface com.alibaba.dubbo.rpc.Protocol, cause: java.io.IOException: invalid constant type: 18 at com.alibaba.dubbo.common.extension.ExtensionLoader.getAdaptiveExtension(ExtensionLoader.java:459) at com.alibaba.dubbo.config.ServiceConfig.(ServiceConfig.java:60) ... 30 more Caused by: java.lang.IllegalStateException: Can not create adaptive extenstion interface com.alibaba.dubbo.rpc.Protocol, cause: java.io.IOException: invalid constant type: 18 at com.alibaba.dubbo.common.extension.ExtensionLoader.createAdaptiveExtension(ExtensionLoader.java:723) at com.alibaba.dubbo.common.extension.ExtensionLoader.getAdaptiveExtension(ExtensionLoader.java:455) ... 31 more Caused by: java.lang.RuntimeException: java.io.IOException: invalid constant type: 18 at javassist.CtClassType.getClassFile2(CtClassType.java:204) at javassist.CtClassType.subtypeOf(CtClassType.java:304) at javassist.compiler.MemberResolver.compareSignature(MemberResolver.java:248) at javassist.compiler.MemberResolver.lookupMethod(MemberResolver.java:120) at javassist.compiler.MemberResolver.lookupMethod(MemberResolver.java:97) at javassist.compiler.MemberCodeGen.atMethodCallCore(MemberCodeGen.java:562) at javassist.compiler.MemberCodeGen.atCallExpr(MemberCodeGen.java:524) at javassist.compiler.JvstCodeGen.atCallExpr(JvstCodeGen.java:244) at javassist.compiler.ast.CallExpr.accept(CallExpr.java:46) at javassist.compiler.MemberCodeGen.atCallExpr(MemberCodeGen.java:497) at javassist.compiler.JvstCodeGen.atCallExpr(JvstCodeGen.java:244) at javassist.compiler.ast.CallExpr.accept(CallExpr.java:46) at javassist.compiler.MemberCodeGen.atCallExpr(MemberCodeGen.java:497) at javassist.compiler.JvstCodeGen.atCallExpr(JvstCodeGen.java:244) at javassist.compiler.ast.CallExpr.accept(CallExpr.java:46) at javassist.compiler.MemberCodeGen.atCallExpr(MemberCodeGen.java:497) at javassist.compiler.JvstCodeGen.atCallExpr(JvstCodeGen.java:244) at javassist.compiler.ast.CallExpr.accept(CallExpr.java:46) at javassist.compiler.CodeGen.atBinExpr(CodeGen.java:964) at javassist.compiler.ast.BinExpr.accept(BinExpr.java:41) at javassist.compiler.JvstCodeGen.atMethodArgs(JvstCodeGen.java:358) at javassist.compiler.MemberCodeGen.atMethodCallCore(MemberCodeGen.java:556) at javassist.compiler.MemberCodeGen.atNewExpr(MemberCodeGen.java:302) at javassist.compiler.ast.NewExpr.accept(NewExpr.java:73) at javassist.compiler.CodeGen.compileExpr(CodeGen.java:230) at javassist.compiler.CodeGen.atThrowStmnt(CodeGen.java:628) at javassist.compiler.CodeGen.atStmnt(CodeGen.java:365) at javassist.compiler.ast.Stmnt.accept(Stmnt.java:50) at javassist.compiler.CodeGen.atIfStmnt(CodeGen.java:391) at javassist.compiler.CodeGen.atStmnt(CodeGen.java:355) at javassist.compiler.ast.Stmnt.accept(Stmnt.java:50) at javassist.compiler.CodeGen.atStmnt(CodeGen.java:351) at javassist.compiler.ast.Stmnt.accept(Stmnt.java:50) at javassist.compiler.CodeGen.atMethodBody(CodeGen.java:292) at javassist.compiler.CodeGen.atMethodDecl(CodeGen.java:274) at javassist.compiler.ast.MethodDecl.accept(MethodDecl.java:44) at javassist.compiler.Javac.compileMethod(Javac.java:169) at javassist.compiler.Javac.compile(Javac.java:95) at javassist.CtNewMethod.make(CtNewMethod.java:74) at javassist.CtNewMethod.make(CtNewMethod.java:45) at com.alibaba.dubbo.common.compiler.support.JavassistCompiler.doCompile(JavassistCompiler.java:119) at com.alibaba.dubbo.common.compiler.support.AbstractCompiler.compile(AbstractCompiler.java:59) at com.alibaba.dubbo.common.compiler.support.AdaptiveCompiler.compile(AdaptiveCompiler.java:46) at com.alibaba.dubbo.common.extension.ExtensionLoader.createAdaptiveExtensionClass(ExtensionLoader.java:739) at com.alibaba.dubbo.common.extension.ExtensionLoader.getAdaptiveExtensionClass(ExtensionLoader.java:732) at com.alibaba.dubbo.common.extension.ExtensionLoader.createAdaptiveExtension(ExtensionLoader.java:721) ... 32 more Caused by: java.io.IOException: invalid constant type: 18 at javassist.bytecode.ConstPool.readOne(ConstPool.java:1113) at javassist.bytecode.ConstPool.read(ConstPool.java:1056) at javassist.bytecode.ConstPool.(ConstPool.java:150) at javassist.bytecode.ClassFile.read(ClassFile.java:765) at javassist.bytecode.ClassFile.(ClassFile.java:109) at javassist.CtClassType.getClassFile2(CtClassType.java:191) ... 77 more 9月 08, 2020 10:34:30 上午 org.apache.catalina.core.StandardContext startInternal 严重: Error listenerStart 9月 08, 2020 10:34:31 上午 org.apache.catalina.util.SessionIdGenerator createSecureRandom 信息: Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [511] milliseconds. 9月 08, 2020 10:34:31 上午 org.apache.catalina.core.StandardContext startInternal 严重: Context [] startup failed due to previous errors 9月 08, 2020 10:34:31 上午 org.apache.catalina.core.ApplicationContext log 信息: Closing Spring root WebApplicationContext 9月 08, 2020 10:34:31 上午 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc 严重: The web application [] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered. 9月 08, 2020 10:34:31 上午 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc 严重: The web application [] registered the JDBC driver [com.mysql.fabric.jdbc.FabricMySQLDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered. 9月 08, 2020 10:34:31 上午 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc 严重: The web application [] registered the JDBC driver [com.alibaba.druid.proxy.DruidDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered. 9月 08, 2020 10:34:31 上午 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc 严重: The web application [] registered the JDBC driver [com.alibaba.druid.mock.MockDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered. 9月 08, 2020 10:34:31 上午 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads 严重: The web application [] appears to have started a thread named [Abandoned connection cleanup thread] but has failed to stop it. This is very likely to create a memory leak. WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by org.apache.catalina.loader.WebappClassLoader (file:/E:/JAVA/Maven/MavenHome/Repository/org/apache/tomcat/embed/tomcat-embed-core/7.0.47/tomcat-embed-core-7.0.47.jar) to field java.lang.Thread.threadLocals WARNING: Please consider reporting this to the maintainers of org.apache.catalina.loader.WebappClassLoader WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release 9月 08, 2020 10:34:31 上午 org.apache.coyote.AbstractProtocol start 信息: Starting ProtocolHandler ["http-bio-8080"] ```
• spring+springmvc+mybatis环境搭建报错 spring

  6年前
  回答 3 已采纳 ## # application.xml spring配置文件内容： --> ## # springmvc-servlet.xml 文件内容： --> ## # LoginController.java package com.zj.controller; import javax.servlet.http.HttpServletRequest; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; import com.zj.entity.UserInfo; import com.zj.service.LoginService; @Controller public class LoginController { private LoginService loginService; public LoginService getLoginService() { return loginService; } @Autowired public void setLoginService(LoginService loginService) { this.loginService = loginService; } @RequestMapping("/login") public ModelAndView login(String username,String password, HttpServletRequest request){ return new ModelAndView("login"); } @RequestMapping("/login2") public ModelAndView testLogin2(String username, String password){ UserInfo ui = new UserInfo(); UserInfo result = this.loginService.find(ui); System.out.println("用户名："+result.getUsername()); // request和response不必非要出现在方法中，如果用不上的话可以去掉 // 参数的名称是与页面控件的name相匹配，参数类型会自动被转换 if (result==null) { return new ModelAndView("loginError"); // 手动实例化ModelAndView完成跳转页面（转发），效果等同于上面的方法返回字符串 }else{ return new ModelAndView("loginSuccess"); } // 采用重定向方式跳转页面 // 重定向还有一种简单写法 // return new ModelAndView("redirect:../index.jsp"); } } } ## # LoginDao.java package com.zj.dao; import com.zj.entity.UserInfo; public interface LoginDao { public UserInfo getUserInfo(UserInfo UserInfo); // public void addUserInfo(UserInfo UserInfo); // // public void updateUserInfo(UserInfo UserInfo); // // public void deleteUserInfo(int UserInfoId); } ## # LoginDao.xml SELECT * FROM userinfo WHERE username=#{username} AND password=#{password} # 业务实现类LoginServiceImpl.java package com.zj.service.impl; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.zj.dao.LoginDao; import com.zj.entity.UserInfo; import com.zj.service.LoginService; @Service("loginService") public class LoginServiceImpl implements LoginService{ private LoginDao loginDao; public LoginDao getUserDao() { return loginDao; } @Autowired public void setUserDao(LoginDao userDao) { this.loginDao = userDao; } public UserInfo find(UserInfo userInfo) { return this.loginDao.getUserInfo(userInfo); } } ## # web.xml pro default /js/* /css/* /imgs/* /fonts/* org.springframework.web.context.ContextLoaderListener contextConfigLocation classpath:config/applicationContext.xml springmvc org.springframework.web.servlet.DispatcherServlet contextConfigLocation classpath:config/springmvc-servlet.xml 1 springmvc / encodingFilter org.springframework.web.filter.CharacterEncodingFilter encoding UTF-8 forceEncoding true encodingFilter /* 30 index.html index.htm index.jsp default.html default.htm default.jsp # 最后是错误信息： Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.zj.dao.LoginDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} 用测试类测试的时候没有问题，一启动tomcat就报错，求看看是哪里的问题，谢谢图片说明](https://img-ask.csdn.net/upload/201512/22/1450795014_103343.png)图片说明](https://img-ask.csdn.net/upload/201512/22/1450794997_116981.png)
• 求前辈推荐springmvc和mybatis的书，多谢！ spring

  3年前
  回答 2 已采纳 小弟现在只是个增删改查工，一方面个人希望有所进步，同时因工作需要，接下来的两个月需要提升springmvc和mybatis的水平，之前看的书里感觉headfirst的和think in java讲得比较生动。希望各位前辈给推荐一哈诸位认为这两种技术学起来最引人入胜的书籍，谢谢了
• springMVC+Spring+Mybatis整合出错 spring

  4年前
  回答 10 已采纳 ``` 八月 29, 2017 2:47:19 下午 org.apache.catalina.startup.HostConfig reload 信息: Reloading context [/SpringMVC] 八月 29, 2017 2:47:19 下午 org.apache.catalina.startup.HostConfig reload 警告: Error during context [/SpringMVC] restart org.apache.catalina.LifecycleException: Failed to initialize component [org.apache.catalina.webresources.JarResourceSet@35dc37a6] at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:441) at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:139) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:173) at org.apache.catalina.webresources.StandardRoot.startInternal(StandardRoot.java:724) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.StandardContext.resourcesStart(StandardContext.java:4758) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4893) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.startup.HostConfig.reload(HostConfig.java:1413) at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1377) at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1613) at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:304) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123) at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1172) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1394) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1398) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1366) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.IllegalArgumentException: java.util.zip.ZipException: invalid END header (bad central directory offset) at org.apache.catalina.webresources.AbstractSingleArchiveResourceSet.initInternal(AbstractSingleArchiveResourceSet.java:114) at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:136) ... 16 more Caused by: java.util.zip.ZipException: invalid END header (bad central directory offset) at java.util.zip.ZipFile.open(Native Method) at java.util.zip.ZipFile.(ZipFile.java:225) at java.util.zip.ZipFile.(ZipFile.java:155) at java.util.jar.JarFile.(JarFile.java:166) at java.util.jar.JarFile.(JarFile.java:103) at org.apache.catalina.webresources.AbstractSingleArchiveResourceSet.initInternal(AbstractSingleArchiveResourceSet.java:111) ... 17 more ``` 以上是tomcat的错误信息，根据在网上的搜索，我检查了web.xml和build_path，都是好好的，对dao层和service层的测试也均正常，下面我贴出web.xml的代码和application.xml的配置 ``` SpringMVC index.html index.htm index.jsp default.html default.htm default.jsp dispatcherServlet org.springframework.web.servlet.DispatcherServlet contextConfigLocation classpath:dispatcherServlet-servlet.xml 1 dispatcherServlet / org.springframework.web.context.ContextLoaderListener contextConfigLocation classpath:applicationContext.xml ``` application.xml的配置 ``` ``` dispatcherServlet-servlet.xml的配置 ``` ``` 如果还需要别的代码，请您回复我，跪求大神帮看看这是什么问题，跪谢！
• 菜鸟做spring+springMVC+mybatis框架中的多表查询时遇到了空指针问题，求解答 spring

  4年前
  回答 2 已采纳 ``` 严重: Servlet.service() for servlet [LOGSYS-manager] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause java.lang.NullPointerException at com.LOGSYS.service.impl.StuInfoServiceImpl.getStuInfo(StuInfoServiceImpl.java:54) 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.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) ``` ``` package com.LOGSYS.service.impl; import java.util.ArrayList; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.LOGSYS.common.pojo.EUDataGridResult; import com.LOGSYS.mapper.ClassInfoMapper; import com.LOGSYS.mapper.StudentInfoMapper; import com.LOGSYS.pojo.ClassInfo; import com.LOGSYS.pojo.ClassInfoExample; import com.LOGSYS.pojo.ClassInfoExample.Criteria; import com.LOGSYS.pojo.StuLinkClsVO; import com.LOGSYS.pojo.StudentInfo; import com.LOGSYS.pojo.StudentInfoExample; import com.LOGSYS.service.StuInfoService; import com.github.pagehelper.PageHelper; import com.github.pagehelper.PageInfo; /** * 学生管理Service * * @ClassName StuInfoServiceImpl * @Description 学生管理Service * @author chenjunjie * @Date 2017年8月15日 下午3:16:22 * @version 1.0.0 */ @Service public class StuInfoServiceImpl implements StuInfoService { @Autowired private StudentInfoMapper sinfoMapper; private ClassInfoMapper cinfoMapper; /** * 学生列表查询 */ @Override public EUDataGridResult getStuInfo(int page, int rows) { // 查询学生列表 StudentInfoExample example = new StudentInfoExample(); ClassInfoExample cExample = new ClassInfoExample(); // 分页处理 PageHelper.startPage(page, rows); List zlist = new ArrayList<>(); ClassInfo info = new ClassInfo(); List list = sinfoMapper.selectByExample(example); for (StudentInfo studentInfo : list) { Criteria criteria = cExample.createCriteria(); criteria.andClsIdEqualTo(studentInfo.getClsId()); List list2 = cinfoMapper.selectByExample(cExample); if (list2 != null && list2.size() > 0) { info = list2.get(0); } StuLinkClsVO stuLinkClsVO = new StuLinkClsVO(info.getCname(), studentInfo.getStuId(), studentInfo.getSno(),studentInfo.getSname(), studentInfo.getsGender(), studentInfo.getClsId(), studentInfo.getStuTel(),studentInfo.getsAddress(), studentInfo.getCreated(), studentInfo.getUpdated(),studentInfo.getRole()); zlist.add(stuLinkClsVO); } // 创建一个返回对象 EUDataGridResult dataGridResult = new EUDataGridResult(); dataGridResult.setRows(zlist); // 取记录总条数 PageInfo pinfo = new PageInfo<>(zlist); dataGridResult.setTotal(pinfo.getTotal()); return dataGridResult; } } ``` 上面是错误信息 我在多表查询时候，是用了mybatis逆向工程生成的mapper和pojo代码。 我新建了一个pojo，里面包括学生pojo 和 班级pojo ，我从学生的Service层中调用班级的mapper，通过byexample查数据库，就会报空指针异常。 54行是 List list2 = cinfoMapper.selectByExample(cExample); 我大概想到，可能是在学生Service中不能去调用班级的mapper完成查询。 但是想解决却毫无头绪。 新学的知识很多地方很薄弱，请各位大神稍作解答，万分感谢了。
• springmvc 和 mybatis的各自的职责是什么 spring

  4年前
  回答 6 已采纳 java web的主要就是围绕数据库的增删改查 是不是主要增删改查 获取数据 前后台数据传递都是由mybatis实现的啊 springmvc主要负责前端页面展示 是不是啊？
• 手把手教你整合最优雅SSM框架：SpringMVC + Spring + MyBatis

  2年前
  李奕锋的博客 小疯手把手带你整合SpringMVC+Spring+MyBatis三大框架，俗称SSM，用它完全代替传统的SSH框架，把它们最优雅的一面发挥出来。整合配置结束后，会有一个应用实例“图书管理系统”带给大家，希望能快速上手这个框架！
• Spring+SpringMVC+Mybatis框架整合例子(SSM) 下载

  7年前
  本资源对应博文：http://blog.csdn.net/zhshulin/article/details/37956105，可以通过博文进行学习，不建议下载完整源码，博文有详细教程，以及代码。
• SSM框架——详细整合教程（Spring+SpringMVC+MyBatis）

  6年前
  AndyLizh的博客 使用SSM（Spring、SpringMVC和Mybatis）已经有三个多月了，项目在技术上已经没有什么难点了，基于现有的技术就可以实现想要的功能，当然肯定有很多可以改进的地方。之前没有记录SSM整合的过程，这次刚刚好基于自己的...
• spring+springmvc+mybatis

  3年前
  spring+springmvc+mybatis 适合练手，但是jdk版本不要太高，不然运行容易出现版本的问题
• Spring+SpringMvc+Mybatis学生管理系统

  2年前
  Spring+SpringMvc+Mybatis学生管理系统，含登录，数据库。
• spring+springMVC+mybatis简单实例

  3年前
  基于SSM框架(Spring+SpringMVC+MyBatis) + Mysql数据库 + Tomcat7
• spring+springmvc+mybatis项目搭建及文件配置

  5月前
  ZY猪猪侠的博客 一、创建maven项目 项目创建完成后目录 ...--mybatis整合spring依赖--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <ve
• Spring+SpringMVC+MyBatis+Springboot介绍

  9月前
  逸轩要冲鸭的博客 SSM（Spring+SpringMVC+MyBatis）框架集由Spring、SpringMVC、MyBatis三个开源框架整合而成，常作为数据源较简单的web项目的框架。 其中spring是一个轻量级的控制反转（IoC）和面向切面（AOP）的容器框架。 ...
• Spring+SpringMVC+Mybatis整合例子

  3年前
  采用Spring+SpringMVC+Mybatis框架进行整合例子，虽然比较简单，但是还是比较适合初学者参考
• Spring+SpringMVC+Mybatis项目快速搭建

  4月前
  Spring+SpringMVC+Mybatis项目连接了数据库 项目的github地址：https://github.com/JackieLing/SSM 大家可以关注我的微信公众号：CodeLinghu 通过后台可以私信我你不懂的地方
• easypoi导出excel遇到的问题,搭配spring+springmvc+mybatis

  3年前
  回答 3 已采纳 18:08:20.146 [http-nio-8080-exec-5] ERROR o.j.poi.cache.ExcelCache - null java.lang.NullPointerException: null at org.jeecgframework.poi.cache.ExcelCache.getWorkbook(ExcelCache.java:61) ~[easypoi-base-2.4.0.jar:na] at org.jeecgframework.poi.excel.export.template.ExcelExportOfTemplateUtil.getCloneWorkBook(ExcelExportOfTemplateUtil.java:217) [easypoi-base-2.4.0.jar:na] at org.jeecgframework.poi.excel.export.template.ExcelExportOfTemplateUtil.createExcleByTemplate(ExcelExportOfTemplateUtil.java:182) [easypoi-base-2.4.0.jar:na] at org.jeecgframework.poi.excel.ExcelExportUtil.exportExcel(ExcelExportUtil.java:165) [easypoi-base-2.4.0.jar:na] at com.TQES.sysmanager.controller.ExportController.fe_map(ExportController.java:170) [classes/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_31] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_31] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_31] at java.lang.reflect.Method.invoke(Method.java:483) ~[na:1.8.0_31] at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221) [spring-web-4.1.7.jar:4.1.7.RELEASE] at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137) [spring-web-4.1.7.jar:4.1.7.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110) [spring-webmvc-4.1.7.jar:4.1.7.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:776) [spring-webmvc-4.1.7.jar:4.1.7.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:705) [spring-webmvc-4.1.7.jar:4.1.7.RELEASE] at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) [spring-webmvc-4.1.7.jar:4.1.7.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959) [spring-webmvc-4.1.7.jar:4.1.7.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893) [spring-webmvc-4.1.7.jar:4.1.7.RELEASE] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967) [spring-webmvc-4.1.7.jar:4.1.7.RELEASE] at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:858) [spring-webmvc-4.1.7.jar:4.1.7.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) [servlet-api.jar:na] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843) [spring-webmvc-4.1.7.jar:4.1.7.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) [servlet-api.jar:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) [catalina.jar:8.0.27] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.27] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-websocket.jar:8.0.27] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.27] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.27] at com.TQES.filter.AuthFilter.doFilter(AuthFilter.java:32) [classes/:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.27] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.27] at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123) [druid-1.0.15.jar:1.0.15] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.27] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.27] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85) [spring-web-4.1.7.jar:4.1.7.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.1.7.jar:4.1.7.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.27] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.27] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:217) [catalina.jar:8.0.27] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) [catalina.jar:8.0.27] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) [catalina.jar:8.0.27] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) [catalina.jar:8.0.27] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [catalina.jar:8.0.27] at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) [catalina.jar:8.0.27] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [catalina.jar:8.0.27] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) [catalina.jar:8.0.27] at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) [tomcat-coyote.jar:8.0.27] at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673) [tomcat-coyote.jar:8.0.27] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500) [tomcat-coyote.jar:8.0.27] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456) [tomcat-coyote.jar:8.0.27] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_31] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_31] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:8.0.27] at java.lang.Thread.run(Thread.java:745) [na:1.8.0_31] 六月 26, 2018 6:08:20 下午 org.apache.catalina.core.StandardWrapperValve invoke 严重: Servlet.service() for servlet [spring] in context with path [/TQES] threw exception [Handler processing failed; nested exception is com.google.common.util.concurrent.ExecutionError: java.lang.NoSuchMethodError: org.apache.poi.util.IOUtils.closeQuietly(Ljava/io/Closeable;)V] with root cause java.lang.NoSuchMethodError: org.apache.poi.util.IOUtils.closeQuietly(Ljava/io/Closeable;)V at org.jeecgframework.poi.cache.manager.FileLoadeImpl.getFile(FileLoadeImpl.java:62) at org.jeecgframework.poi.cache.manager.POICacheManager$1.load(POICacheManager.java:57) at org.jeecgframework.poi.cache.manager.POICacheManager$1.load(POICacheManager.java:52) at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3542) at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2323) at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2286) at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2201) at com.google.common.cache.LocalCache.get(LocalCache.java:3953) at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3957) at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4875) at org.jeecgframework.poi.cache.manager.POICacheManager.getFile(POICacheManager.java:67) at org.jeecgframework.poi.cache.ExcelCache.getWorkbook(ExcelCache.java:44) at org.jeecgframework.poi.excel.export.template.ExcelExportOfTemplateUtil.getCloneWorkBook(ExcelExportOfTemplateUtil.java:217) at org.jeecgframework.poi.excel.export.template.ExcelExportOfTemplateUtil.createExcleByTemplate(ExcelExportOfTemplateUtil.java:182) at org.jeecgframework.poi.excel.ExcelExportUtil.exportExcel(ExcelExportUtil.java:165) at com.TQES.sysmanager.controller.ExportController.fe_map(ExportController.java:170) 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:483) at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:776) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:705) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
• (spring+springmvc+mybatis)我想做Shiro的一个IP地址白名单 spring

  4年前
  回答 2 已采纳 **询问下各位大牛,我想用Shiro实现对IP地址的拦截,然后做一个白名单和黑名单,能给个思路或者代码片段吗?**