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+JDBCTempleat+Duird+BeanUtils+tomcat
数据库设计：

-- 创建表
CREATE TABLE user(
    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

图解分析

java代码

配置文件

driverClassName=com.mysql.cj.jdbc.Driver
url=jdbc:mysql:///videopractice
username=root
password=root
# 初始化连接数量
initialSize=5
# 最大连接树
maxActive=10
# 最大等待时间
maxWait=3000

domain层

package com.bai.domain;

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

    public User(int id, String name, String gender, int 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;
    }

    public User() {
    }

    public int getId() {
        return id;
    }

    public void setId(int 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 int getAge() {
        return age;
    }

    public void setAge(int 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;
    }

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

dao层

UserDao接口

package com.bai.dao;

import com.bai.domain.User;

import java.util.List;

/**
 * 用户操作的Dao
 */
public interface UserDao {
    public List<User> findAll();
}

UserDaoImpl类

package com.bai.dao.Impl;

import com.bai.dao.UserDao;
import com.bai.domain.User;
import com.bai.util.JDBCUtils;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;

import java.util.List;

public class UserDaoImpl implements UserDao {

    private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());
    public List<User> findAll() {
        //使用JDBC操作数据库
        //1.定义sql
        String sql="select * from user";
        List<User> query = template.query(sql, new BeanPropertyRowMapper<User>(User.class));
        return query;
    }
}

service层

UserService接口

package com.bai.service;

import com.bai.domain.User;

import java.util.List;

/**
 * 用户管理的业务接口
 */
public interface UserService {
    /**
     * 查询所有用户信息
     */
    public List<User> findAll();

}

UserServiceImpl类

package com.bai.service.img;

import com.bai.dao.Impl.UserDaoImpl;
import com.bai.dao.UserDao;
import com.bai.domain.User;
import com.bai.service.UserService;

import java.util.List;

public class UserServiceImpl implements UserService {
    private UserDao dao=new UserDaoImpl();
    //调用Dao完成查询
    public List<User> findAll() {
        //调用Dao完成查询
        return dao.findAll();
    }
}

工具类

package com.bai.util;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
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();
    }

}

web代码

package com.bai.web.servlet;


import com.bai.domain.User;
import com.bai.service.img.UserServiceImpl;

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

public class UserListServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.调用UserService完成查询
        UserServiceImpl service = new UserServiceImpl();
        List<User> users = service.findAll();
        //2.将list存入request域
        req.setAttribute("users",users);
        //3.转发到list.jsp
        req.getRequestDispatcher("/list.jsp").forward(req,resp);
    }

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

前端页面

index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Bootstrap全局css样式5</title>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <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>首页</title>

  <!-- Bootstrap -->
  <link href="css/bootstrap.min.css" rel="stylesheet">

  <!-- jQuery(Bootstrap的所有javaScrpt插件都依赖) -->
  <script src="js/bootstrap.min.js"></script>
  <!-- 加载Bootstrap 的所有 javaScript插件 你也可以根据需要只加载单个插件 -->
  <script src="./js/bootstrap.js"></script>
  <script src="text/javascript"></script>
</head>
<body>
<div align="center">
  <a href="${pageContext.request.contextPath}/UserListServlet" style="text-decoration:none;font-size:33px">查询所有用户信息

  </a>
</div>
</body>
</html>

list.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <meta charset="utf-8">
    <title>Bootstrap全局css样式5</title>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <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>列表</title>

    <!-- Bootstrap -->
    <link href="css/bootstrap.min.css" rel="stylesheet">

    <!-- jQuery(Bootstrap的所有javaScrpt插件都依赖) -->
    <script src="js/bootstrap.min.js"></script>
    <!-- 加载Bootstrap 的所有 javaScript插件 你也可以根据需要只加载单个插件 -->
    <script src="./js/bootstrap.js"></script>
    <script src="text/javascript"></script>
</head>
<body>
<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="${users}" var="user" varStatus="s">
        <tr>
            <td>${s.count}</td>
            <td>${user.name}</td>
            <td>${user.gender}</td>
            <td>${user.age}</td>
            <td>${user.address}</td>
            <td>${user.qq}</td>
            <td>${user.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>
</body>
</html>