初学idea_03_java web项目的简单搭建及运行02

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本文详细介绍如何使用Java创建Web应用程序，包括POJO类的创建、Servlet的编写、JSP页面的设计以及项目的热部署过程。通过实例展示了如何在Servlet中处理用户数据并传递到JSP页面进行展示。

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1. 创建pojo

创建get和set方法：

右击-----》Generate

2、创建servlet

UserListServlet.java

package com.fjz.servlet;

import com.fjz.pojo.User;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

@WebServlet(name = "UserListServlet", value="/userList")
public class UserListServlet extends HttpServlet {
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        User user1 = new User("张三",20);
        User user2 = new User("李四",28);
        User user3 = new User("王五",200);

        List userlist = new ArrayList();
        userlist.add(user1);
        userlist.add(user2);
        userlist.add(user3);

        request.setAttribute("userList",userlist);
        request.getRequestDispatcher("WEB-INF/jsp/userList.jsp").forward(request,response);
    }
}

3. userList.jsp

<%--
  Created by IntelliJ IDEA.
  User: fengjinzhu
  Date: 2019/1/3
  Time: 16:33
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <table border="1">
        <tr>
            <td>用户名</td>
            <td>年龄</td>
        </tr>
        <c:forEach items="${userList }" var="user">
            <tr>
                <td>${user.name}</td>
                <td>${user.age}</td>
            </tr>
        </c:forEach>

    </table>
</body>
</html>

在写这里的时候，taglib这个标签中的uri不能自动显示，这是因为jstl-1.2.jar这个包没加载进来

idea不能跟eclipse一样自动加载jar包，所以我们得手动加载

4. index.jsp

<%--
  Created by IntelliJ IDEA.
  User: fengjinzhu
  Date: 2019/1/3
  Time: 15:40
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>$Title$</title>
  </head>
  <body>
    <a href="${pageContext.request.contextPath}/userList">查看用户</a>
  </body>
</html>