xml出现Exception in thread "main" java.lang.NullPointerException怎么解决

运行代码出现Exception in thread "main" java.lang.NullPointerException

图片说明图片说明

JsoupDemo1.java代码如下:

package study.java.xml.jsoup;

/*
* Jsoup快速入门
* */


import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

import java.io.File;
import java.io.IOException;

public class JsoupDemo1 {
    public static void main(String[] args) throws IOException {
        //2.1获取student.xml的path
        String path = JsoupDemo1.class.getClassLoader().getResource("src\\student.xml").getPath();
        //上面的student.xml是已经写好的xml文件
        //2.2解析xml文档,加载文档进内存,获取dom树--->Document
        Document document = Jsoup.parse(new File(path), "UTF-8");
        //3.获取xml文档里面的元素标签对象 Element-----name
        Elements elements = document.getElementsByTag("name");

        System.out.println(elements.size());
        //3.1获取第一个name的Element对象
        Element element = elements.get(0);
        //3.2获取数据
        String name = element.text();
        System.out.println(name);
    }
}





student.xml代码如下:

<?xml version="1.0" encoding="UTF-8" ?>
<students>
    <student number="heima_0001">
        <name>zhangsan</name>
        <age>11</age>
        <sex>male</sex>

    </student>
    <student number="heima_0002">
        <name>lisi</name>
        <age>44</age>
        <sex>female</sex>
    </student>
</students>

5个回答

你试试这样
String path = JsoupDemo1.class.getClassLoader().getResource("student.xml").getPath();

xsb_20171227
今天是星期五 回复叶子卿卿: 那你打断点调试一下JsoupDemo1.class.getClassLoader().getResource("")这句话究竟是在你项目中的哪儿,然后看一下你这个项目编译后的文件夹中,student.xml在哪里!
4 个月之前 回复
qq_40878723
叶子卿卿 改成("student.xml"),会出现java.io.FileNotFoundException:
4 个月之前 回复

getResource("src\student.xml")
应该是到getResource这报空了,找不到文件,java会从资源文件夹为起点开始找东西,一般是resourse文件夹下
你的项目怎么搭的我不太清除,但是一般不会带有src目录,因为正常的结构src是java和resource的父级目录

图片说明
我也遇到了这个问题 我也试过把xml文件放在src下 但还是报错 然后我把.java文件也放src之后就可以了 之后又把。java和xml文件一起放在自定义文件夹里也可以了....有点迷惑
顺便问下...idea同一个窗口建多个项目咋搞啊

qq_41639457
涡轮平滑 回复叶子卿卿: 新建提示新窗口或者当前窗口的嘛 点当前窗口之前的就没了啊...
4 个月之前 回复
qq_40878723
叶子卿卿 直接新建一个项目
4 个月之前 回复

可能是地址有空格导致的,在getPath()前面加个toURI()方法就行,

这个问题我在刚才也遇到了,只不过我的代码报错原因是将xml文件没有放在src路径下,所以在我将文件放在src路径下后成功运行。看了下你图中的代码在获取路径的时候你不必写成src\student.xml,因为你的student.xml文件已经放在了项目的src路径下,直接将路径写为student.xml即可。

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dubbo启动服务端报这个错,在线急等,麻烦大神帮忙看看

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org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302) at org.apache.struts2.dispatcher.ServletDispatcherResult.doExecute(ServletDispatcherResult.java:139) at org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:178) at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:348) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:253) at 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org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:50) at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:504) at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:419) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.struts2.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:99) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Unknown Source)

dubbo启动服务出错,急求大神帮忙看看

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Servlet.service() for servlet 异常

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javax.el.BeanELResolver.getValue(BeanELResolver.java:83) at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54) at org.apache.el.parser.AstValue.getValue(AstValue.java:123) at org.apache.el.parser.AstEmpty.getValue(AstEmpty.java:45) at org.apache.el.parser.AstNot.getValue(AstNot.java:42) at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:182) at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:919) at org.apache.jsp.WEB_002dINF.html.talent.index_jsp._jspx_meth_c_005fif_005f2(index_jsp.java:818) at org.apache.jsp.WEB_002dINF.html.talent.index_jsp._jspService(index_jsp.java:344) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:723) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) at javax.servlet.http.HttpServlet.service(HttpServlet.java:723) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646) at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551) at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488) at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968) at org.apache.jasper.runtime.PageContextImpl.doInclude(PageContextImpl.java:656) at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:650) at org.apache.tiles.jsp.context.JspTilesRequestContext.include(JspTilesRequestContext.java:103) at org.apache.tiles.jsp.context.JspTilesRequestContext.dispatch(JspTilesRequestContext.java:96) at org.apache.tiles.renderer.impl.TemplateAttributeRenderer.write(TemplateAttributeRenderer.java:44) at org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:106) at org.apache.tiles.renderer.impl.ChainedDelegateAttributeRenderer.write(ChainedDelegateAttributeRenderer.java:76) at org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:106) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:670) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:336) at org.apache.tiles.template.InsertAttributeModel.renderAttribute(InsertAttributeModel.java:210) at org.apache.tiles.template.InsertAttributeModel.end(InsertAttributeModel.java:126) at org.apache.tiles.jsp.taglib.InsertAttributeTag.doTag(InsertAttributeTag.java:311) at org.apache.jsp.WEB_002dINF.html.default_jsp._jspx_meth_tiles_005finsertAttribute_005f0(default_jsp.java:83) at org.apache.jsp.WEB_002dINF.html.default_jsp._jspService(default_jsp.java:58) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:723) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) at javax.servlet.http.HttpServlet.service(HttpServlet.java:723) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302) at org.apache.tiles.servlet.context.ServletTilesRequestContext.forward(ServletTilesRequestContext.java:241) at org.apache.tiles.servlet.context.ServletTilesRequestContext.dispatch(ServletTilesRequestContext.java:222) at org.apache.tiles.renderer.impl.TemplateAttributeRenderer.write(TemplateAttributeRenderer.java:44) at org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:106) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:670) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:690) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:644) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:627) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:321) at org.springframework.web.servlet.view.tiles2.TilesView.renderMergedOutputModel(TilesView.java:124) at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:264) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1208) at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:992) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:939) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:915) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:811) at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:796) at javax.servlet.http.HttpServlet.service(HttpServlet.java:723) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:722)

运行tomcat 提示错误信息HTTP Status 500 – Internal Server Error?

怎样解决下列错误啊,求各位大神指教!!!! [图片说明](https://img-ask.csdn.net/upload/201812/26/1545789119_137252.jpg)

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