                        课程
                    
                        /后端开发
                        
                            /Java
                        
                        /使用JSP+Servlet技术生成报表

程序全部都写完后，发现打开首页正常，点击生成报表，直接出现了404的报错！？

HTTP Status 404 - /TestReport/ShowReport

type Status report

message /TestReport/ShowReport

description The requested resource is not available.

Apache Tomcat/7.0.85

http://localhost:8080/TestReport/ShowReport

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
   xmlns="http://java.sun.com/xml/ns/javaee"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name></display-name>
<servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>ShowReport</servlet-name>
    <servlet-class>servlet.ShowReport</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>ShowReport</servlet-name>
    <url-pattern>/servlet/ShowReport</url-pattern>
</servlet-mapping>
<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

-------------------------------------------------------------------------------------------

........................

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public void doPost(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException {
       //----------------控制层--------------------------------------------

       Service service=new Service();
       List list=service.getProfit();//看起来这里没有new，那是因为在service里面new过了。

       request.getSession().setAttribute("PROFIT", list);
       response.sendRedirect("index.jsp");