案例_用户信息列表展示

案例：用户信息列表展示

• 需求：用户信息的增删改查操作
• 设计：
  • 技术选型：Servlet+JSP+MySQL+JDBCTemplate+Druid+BeanUtils+tomcat
  • 数据库设计

create database day17; -- 创建忽聚酷
user day17; -- 使用数据库
create table user( -- 创建表
	id int primary key auto_increment,
	name varchar(20) not null,
	gender varchar(5),
	age int,
	address varchar(32),
	qq varchar(20),
	email varchar(50)
)

• 开发：

  • 环境搭建
    • 创建数据库环境
    • 创建项目，导入需要的jar包
  • 编码

• 测试

• 部署运维

• 列表查询代码实现分析：
  

代码实现：

• userDao

package com.ailyt.dao;

import com.ailyt.domain.User;

import java.util.ArrayList;
import java.util.List;

public interface UserDao {
    public List<User> findAll();

}

• UserDaoImpl

package com.ailyt.dao;

import com.ailyt.Utils.JDBCUtils;
import com.ailyt.domain.User;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;

import java.util.List;

public class UserDapImpl implements UserDao {
    private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());
    @Override
    public List<User> findAll() {
        //实现JDBC数据库操作
        //1、定义sql
        String sql = "select * from user";
        List<User> users = template.query(sql, new BeanPropertyRowMapper<User>(User.class));
        return users;
    }
}

• User:

package com.ailyt.domain;

import java.util.Date;

public class User {
    private Integer id;
    private String name;
    private String gender;
    private Integer age;
    private String address;
    private String qq;
    private String email;

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", gender='" + gender + '\'' +
                ", age=" + age +
                ", address='" + address + '\'' +
                ", qq='" + qq + '\'' +
                ", email='" + email + '\'' +
                '}';
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public Integer getAge() {
        return age;
    }

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

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getQq() {
        return qq;
    }

    public void setQq(String qq) {
        this.qq = qq;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public User() {
    }

    public User(Integer id, String name, String gender, Integer age, String address, String qq, String email) {
        this.id = id;
        this.name = name;
        this.gender = gender;
        this.age = age;
        this.address = address;
        this.qq = qq;
        this.email = email;
    }
}

• UserService:

package com.ailyt.service;

import com.ailyt.domain.User;

import java.util.ArrayList;
import java.util.List;

public interface UserService {
    public List<User> findAll();
}

UserServiceImpl:

package com.ailyt.service;

import com.ailyt.dao.UserDapImpl;
import com.ailyt.domain.User;

import java.util.List;

public class UserServiceImpl implements UserService{
    private UserDapImpl userDao = new UserDapImpl();

    @Override
    public List<User> findAll() {
        return userDao.findAll();
    }
}

• UserServlet:

package com.ailyt.servlet;

import com.ailyt.domain.User;
import com.ailyt.service.UserService;
import com.ailyt.service.UserServiceImpl;

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;

@WebServlet(value = "/userListServlet")
public class UserServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html;charset=utf-8");

        //调用UserService完成查询
        UserService userService = new UserServiceImpl();
        List<User> all = userService.findAll();
        //将查询出来的信息存入request域
        req.setAttribute("list",all);
        //转发
        req.getRequestDispatcher("/list.jsp").forward(req,resp);

    }
}

• JDBCUtils

package com.ailyt.Utils;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import javax.xml.crypto.Data;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;

/**
 * JDBC工具类 使用Durid连接池
 */
public class JDBCUtils {

    private static DataSource ds ;

    static {

        try {
            //1.加载配置文件
            Properties pro = new Properties();
            //使用ClassLoader加载配置文件，获取字节输入流
            InputStream is = JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties");
            pro.load(is);

            //2.初始化连接池对象
            ds = DruidDataSourceFactory.createDataSource(pro);

        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 获取连接池对象
     */
    public static DataSource getDataSource(){
        return ds;
    }


    /**
     * 获取连接Connection对象
     */
    public static Connection getConnection() throws SQLException {
        return  ds.getConnection();
    }
}

• index.jsp

<%--
  Created by IntelliJ IDEA.
  User: lihaiyang
  Date: 2022/8/17
  Time: 9:05
  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}/userListServlet"style="text-decoration:none;font-size:33px">查询所有用户信息
    </a>
</body>
</html>

• list.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
  Created by IntelliJ IDEA.
  User: lihaiyang
  Date: 2022/8/17
  Time: 9:19
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<!-- 网页使用的语言 -->
<html lang="zh-CN">
<head>
    <!-- 指定字符集 -->
    <meta charset="utf-8">
    <!-- 使用Edge最新的浏览器的渲染方式 -->
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <!-- viewport视口：网页可以根据设置的宽度自动进行适配，在浏览器的内部虚拟一个容器，容器的宽度与设备的宽度相同。
    width: 默认宽度与设备的宽度相同
    initial-scale: 初始的缩放比，为1:1 -->
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
    <title>用户信息管理系统</title>

    <!-- 1. 导入CSS的全局样式 -->
    <link href="css/bootstrap.min.css" rel="stylesheet">
    <!-- 2. jQuery导入，建议使用1.9以上的版本 -->
    <script src="js/jquery-2.1.0.min.js"></script>
    <!-- 3. 导入bootstrap的js文件 -->
    <script src="js/bootstrap.min.js"></script>
    <style type="text/css">
        td, th {
            text-align: center;
        }
    </style>
</head>
<body>
<div class="container">
    <h3 style="text-align: center">用户信息列表</h3>
    <table border="1" class="table table-bordered table-hover">
        <tr class="success">
            <th>编号</th>
            <th>姓名</th>
            <th>性别</th>
            <th>年龄</th>
            <th>籍贯</th>
            <th>QQ</th>
            <th>邮箱</th>
            <th>操作</th>
        </tr>

        <c:forEach items="${list}" var="list">

            <tr>
                <td>${list.id}</td>
                <td>${list.name}</td>
                <td>${list.gender}</td>
                <td>${list.age}</td>
                <td>${list.address}</td>
                <td>${list.qq}</td>
                <td>${list.email}</td>
                <td><a class="btn btn-default btn-sm" href="update.html">修改</a>&nbsp;<a class="btn btn-default btn-sm" href="">删除</a></td>
            </tr>
        </c:forEach>

        <tr>
            <td colspan="8" align="center"><a class="btn btn-primary" href="add.html">添加联系人</a></td>
        </tr>
    </table>
</div>
</body>
</html>