c:forEach如何才能终止，我的终止不了

纹枰老妖 2020-05-29 05:09:21

我创建了一个webproject项目，然后用浏览器打开，浏览器运行不了，错误如下图：

下面我说一下这个项目如何创建的，首先是数据库建表【ch09_user_table】，这个略过不提。直接说下面：
我用mysclipse新建一个webproject工程，命名为【ShowUser】，然后在这个工程建了一个【com.throne212.javaweb.ch09】的包，该包下面写了两个类：【User】和【QueryUserServlet】，这两个类的源代码如下
首先是user类的：

package com.throne212.javaweb.ch09;



public class User {

	private String username;

	private String password;

	private String gender;

	private int    age;

	private String description;

	

	public String getUsername(){

		return username;

	}

	public void setUsername(String username){

		this.username = username;

	}

	

	public String getPassword(){

		return password;

	}

	public void setPassword(String password){

		this.password = password;

	}

	

	public String getGender(){

		return gender;

	}

	public void setGender(String gender){

		this.gender = gender;

	}

	

	public int getAge(){

		return age;

	}

	public void setAge(int age){

		this.age = age;

	}

	

	public String getDescription(){

		return description;

	}

	public void setDescription(String description){

		this.description = description;

	}

}

*********分割线，下面的代码是QueryUserServlet类的内容*******

package com.throne212.javaweb.ch09;

import java.io.IOException;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class QueryUserServlet extends HttpServlet{

	static{

		try{

			Class.forName("com.mysql.jdbc.Driver");

		}catch(ClassNotFoundException e){

			e.printStackTrace();

		}

	}

	

	private static final String url = "jdbc:mysql://localhost:3306/test";

	private static final String username = "root";

	private static final String password="123";

	

	public void doGet(HttpServletRequest request, HttpServletResponse response)throws IOException,ServletException{

		this.doPost(request, response);

	}

	public void doPost(HttpServletRequest request,HttpServletResponse response)throws IOException,ServletException{

		List<User> users = new ArrayList<User>();

		

		Connection conn = null;

		PreparedStatement ps = null;

		ResultSet rs = null;

		

		try{

			String sql = "select * from ch09_user_table";                //获取连接

			conn = DriverManager.getConnection(url, username, password); //创建会话

			ps = conn.prepareStatement(sql);                             //执行查询

			rs = ps.executeQuery();

			if(rs.next()){

				User user = new User();

				user.setUsername(rs.getString("username"));

				user.setPassword(rs.getString("password"));

				user.setAge(rs.getInt("age"));

				user.setGender(rs.getString("gender"));

				user.setDescription(rs.getString("description"));

				

				users.add(user);

			}

		}catch(SQLException e){

			e.printStackTrace();

		}finally{

			if(rs != null){

				try{

					rs.close();

				}catch(SQLException e){

					e.printStackTrace();

				}

			}

			

			if(ps != null){

				try{

					ps.close();

				}catch(SQLException e){

					e.printStackTrace();

				}

			}

			

			if(conn != null){

				try{

					conn.close();

				}catch(SQLException e){

					e.printStackTrace();

				}

			}

		}

		

		request.setAttribute("users", users);

		request.getRequestDispatcher("list.jsp").forward(request, response);

	}

}

再然后，我在该项目的【/ShowUser/WebRoot】目录下，创建了一个【list.jsp】文件，文件的详细内容如下：

<%@ page language="java" pageEncoding="UTF-8"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>





<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

	<title>用户列表</title>

	<meta http-equiv="content-type" content="text/html; charset=UTF-8">

</head>

  

<body>

	<table border="1" align="center">

	

	<tr>

	  <th>用户名：</th>

	  <th>密码：</th>

	  <th>年龄：</th>

	  <th>性别</th>

	  <th>简介</th>

	</tr>

	

	<!-- 使用<c:forEach>标签遍历所有用户 -->

	<c:forEach var="user" items="${requestScope.users}">

	<tr>

	  <td>

	    ${user.username }

	  </td>

	  

	  <td>

	    <c:if test="${!empty user.password}">***</c:if>

	  </td>

	  

	  <td>

	    ${user.age}

	  </td>

	  

	  <td>

	    <c:if test="${user.gender == 'male'}">男</c:if>

	    <c:if test="${user.gender == 'female'}">女</c:if>

	  </td>

	  

	  <td>

	    ${user.description}

	  </td>

	</tr>

	</c:forEach>

	</table>

</body>

</html>

最后，我在【web.xml】文件中修改了一下配置，修改后的【web.xml】如下：

<?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">

 <servlet>

  <servlet-name>QueryUserServlet</servlet-name>

  <servlet-class>com.throne212.javaweb.ch09.QueryUserServlet</servlet-class>

 </servlet>

 <servlet-mapping>

  <servlet-name>QueryUserServlet</servlet-name>

  <url-pattern>/QueryUserServlet</url-pattern>

 </servlet-mapping>

 <welcome-file-list>

  <welcome-file>list.jsp</welcome-file>

 </welcome-file-list>

</web-app>

接下来就是部署应用，服务器选择了【Tomcat6.x】，然后启动了Tomcat，打开浏览器，地址栏输入【http://localhost:8080/ShowUser/QueryUserServlet】，但浏览器的反应却不是教科书上的，就像问题里的图片一样。所以我来这儿问下热心的朋友，这是什么原因，我应该怎么做啊？

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