[JavaScript知识库] MVC模式的简单实例--查询所有用户信息(el表达式和jstl)

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[JavaScript知识库]MVC模式的简单实例--查询所有用户信息(el表达式和jstl)

作者:token keyword

目录结构

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执行流程图

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执行结果(修改和删除功能未实现)

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index.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
  Created by IntelliJ IDEA.
  User: 16949
  Date: 2022/5/7
  Time: 15:41
  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>
        <%--<c:out value="${pageContext.request.contextPath}"></c:out>--%>
        <a href="${pageContext.request.contextPath}/FindAllUserServlet">查询所有用户信息</a>
    </body>
</html>

userlist.jsp

<%--
  Created by IntelliJ IDEA.
  User: 16949
  Date: 2022/5/7
  Time: 15:51
  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>用户列表信息</title>
    </head>
    <body>
        <table border="1px" width="600px" bgcolor="#ffb6c1" align="center">
            <tr>
                <th>用户序号</th>
                <th>用户id </th>
                <th>用户姓名</th>
                <th>用户性别</th>
                <th>用户年龄</th>
                <th>操作</th>
            </tr>
            <c:forEach items="${users}" var="user" varStatus="vs">
                <tr>
                    <th>${vs.count}</th>
                    <th>${user.uid}</th>
                    <th>${user.username}</th>
                    <th>${user.sex}</th>
                    <th>${user.age}</th>
                    <th>
                        <a href="#">修改</a>
                        <a href="#">删除</a>
                    </th>
                </tr>
            </c:forEach>
        </table>
    </body>
</html>

User类

package com.itheima.domain;

import java.io.Serializable;

/**
 * @program:
 * @description
 * @author: YunLong
 **/
public class User implements Serializable  {

    private String uid;

    private String username;

    private String sex;

    private String age;

    public User() {
    }

    public User(String uid, String username, String sex, String age) {
        this.uid = uid;
        this.username = username;
        this.sex = sex;
        this.age = age;
    }

    public String getUid() {
        return uid;
    }

    public void setUid(String uid) {
        this.uid = uid;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }
}

FindAllUserServlet类

package com.itheima.web;

import com.itheima.domain.User;
import com.itheima.service.UserService;

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.List;

/**
 * @program:
 * @description
 * @author: YunLong
 **/
@WebServlet(urlPatterns = "/FindAllUserServlet")
public class FindAllUserServlet extends HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException,
            IOException {
        // 处理响应中文乱码    
        response.setContentType("text/html;charset=utf-8");
        //创建service层的对象
        UserService service = new UserService();
        //调用查询所有用户信息的方法
        List<User> users = service.findAllUsers();
        //将查询结果保存在request域中
        request.setAttribute("users",users);
        //转发到userList.jsp页面中
        request.getRequestDispatcher("/userList.jsp").forward(request,response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException,
            IOException {
        // 处理请求的中文乱码    
        request.setCharacterEncoding("utf-8");
        doGet(request, response);
    }

}

UserService类

package com.itheima.service;

import com.itheima.dao.UserDao;
import com.itheima.domain.User;

import java.util.List;

/**
 * @program:
 * @description
 * @author: YunLong
 **/
public class UserService {
    public List<User> findAllUsers() {
        //创建dao层的对象
        UserDao dao = new UserDao();
        //调用dao层的方法
        List<User> users = dao.findAllUsers();
        return users;
    }
}

UserDao类

package com.itheima.dao;

import com.itheima.domain.User;

import java.io.*;
import java.util.ArrayList;
import java.util.List;

/*
  读取用户数据
 */
public class UserDao {
    public List<User> findAllUsers() {
        List<User> users = new ArrayList<>();
        try {
            BufferedReader bf = new BufferedReader(new InputStreamReader(new FileInputStream("d:/user.txt"),"UTF-8"));
            String line;
            while((line=bf.readLine())!=null){

                User user = new User();
                user.setUid(line.split("\\,")[0]);
                user.setUsername(line.split("\\,")[1]);
                user.setAge(line.split("\\,")[3]);
                user.setSex(line.split("\\,")[2]);
                users.add(user);

            }

        } catch (Exception e) {
            e.printStackTrace();
        }
        return users;
    }
}