使用IDEA完成登录与注册-Toy模板网

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一，完成数据库编写

DROP DATABASE if EXISTS mydb;
CREATE DATABASE mydb;
use mydb;

CREATE TABLE ta_user
(
  uid int primary key auto_increment,
	username varchar(32),
	password varchar(32),
	phone varchar(32),
	address varchar(32)
);

INSERT INTO ta_user(username,password,phone,address)VALUES('张三','123','12323231','北京');
INSERT INTO ta_user(username,password,phone,address)VALUES('李四','456','35343434','上海');
INSERT INTO ta_user(username,password,phone,address)VALUES('王五','789','33234324','河南');

SELECT * from ta_user;

二，网页前端显示部分（HTML部分）

注：注意文件创建地方

分层思想：创建一些包将一大堆代码分散到各个包中，可以使代码简洁，容易后期维护

使用IDEA完成登录与注册

主页面

<%--
  Created by IntelliJ IDEA.
  User: ThinkPad
  Date: 2023/2/18
  Time: 8:35
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>首页</title>
  </head>
  <body>
  <a href="login.jsp">去登陆</a>
  </body>
</html>

登录页面

<%--
  Created by IntelliJ IDEA.
  User: ThinkPad
  Date: 2023/2/18
  Time: 8:37
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>登录页面</title>
</head>
<body>
<%--有jsp不经过数据，没有jsp经过--%>
<form action="login" method="post">
  账号：<input type="text" name="username"><br>
  密码：<input type="password" name="password"><br>
  <input type="submit" value="登录"><br>
    <a href="register.jsp">没有账号？前往注册</a>
    <a href="index.jsp">返回首页</a>
</form>
</body>
</html>

注册页面

<%--
  Created by IntelliJ IDEA.
  User: ThinkPad
  Date: 2023/2/18
  Time: 12:27
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>注册</title>
</head>
<body>
<form action="register" method="post">
  账号：<input type="text" name="username"><br>
  密码：<input type="password" name="password"><br>
  号码：<input type="password" name="phone"><br>
  地址：<input type="password" name="address"><br>
  <input type="submit" value="注册"><br>
  <a href="login.jsp">有账号？前往登录</a>
  <a href="index.jsp">返回首页</a>
</form>
</body>
</html>

错误页面

<%--
  Created by IntelliJ IDEA.
  User: ThinkPad
  Date: 2023/2/18
  Time: 9:50
  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>错误</a>
<a href="index.jsp">返回登录页面</a>
</body>
</html>

登陆成功后跳转页面

<%--
  Created by IntelliJ IDEA.
  User: ThinkPad
  Date: 2023/2/18
  Time: 9:30
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>商品</title>
</head>
<body>
<form>
  <tr>
    <td>苹果</td>
    <td>2</td>
  </tr>
  <tr>
    <td>橘子</td>
    <td>6</td>
  </tr>
  <tr>
    <td>香蕉</td>
    <td>5</td>
  </tr>
</form>
</body>
</html>

三，后端控制部分（Java部分）

bean包用来放属性的构造方法

package com.smrsar.bean;

public class User {
    private Integer uid;
    private String username;
    private String password;
    private String phone;
    private String address;

    public User() {
    }

    @Override
    public String toString() {
        return "User{" +
                "uid=" + uid +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", phone='" + phone + '\'' +
                ", address='" + address + '\'' +
                '}';
    }

    public Integer getUid() {
        return uid;
    }

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

    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 getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getAddress() {
        return address;
    }

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

    public User(Integer uid, String username, String password, String phone, String address) {
        this.uid = uid;
        this.username = username;
        this.password = password;
        this.phone = phone;
        this.address = address;
    }
}

package com.smrsar.bean;

public class Userz {
    private Integer uid;
    private String username;
    private String password;

    public Userz() {
    }

    @Override
    public String toString() {
        return "Userz{" +
                "uid=" + uid +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }

    public Integer getUid() {
        return uid;
    }

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

    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 Userz(Integer uid, String username, String password) {
        this.uid = uid;
        this.username = username;
        this.password = password;
    }
}

dao包用来放Java代码（注册部分的JDBC代码，分层方法：构建成一个方法，在Servlet中直接调用）

package com.smrsar.dao;
import com.smrsar.bean.User;
import com.smrsar.util.JDBCUtil;
import java.sql.Connection;
import java.sql.PreparedStatement;

public class UserDaoImpl {

    public int register (User user){
        Connection con = null;
        PreparedStatement pstm = null;
        int row = 0;
        try {
            //1，获取数据库连接
            con=JDBCUtil.GetCon();
            //2，定义sql语句
            String sql = "insert into ta_user(username,password,phone,address)values (?,?,?,?)";
            //3.获取预处理对象
            pstm = con.prepareStatement(sql);
            //4，传参
            pstm.setObject(1, user.getUsername());
            pstm.setObject(2, user.getPassword());
            pstm.setObject(3, user.getPhone());
            pstm.setObject(4, user.getAddress());
            //5，执行更新（增删改）
            row = pstm.executeUpdate();

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

            try {
                if (pstm != null) {
                    pstm.close();
                }
                if (con != null) {
                    con.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return row;
    }

}

JDBC工具类构造方法用来调用

package com.smrsar.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class JDBCUtil {
    private static String driver = "com.mysql.cj.jdbc.Driver";
    private static String url = "jdbc:mysql://localhost:3306/mydb?useSSL=false&serverTimezone=UTC";
    private static String username = "root";
    private static String password = "root";

    public static Connection con = null;

    public static Connection GetCon() {
        try {
            Class.forName(driver);
            con = DriverManager.getConnection(url, username, password);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return con;
    }

    public static void Close(ResultSet rs, PreparedStatement pstm, Connection con) {
        try {
            if (rs != null) {
                rs.close();
            }
            if (pstm != null) {
                pstm.close();
            }
            if (con != null) {
                con.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

登录和注册servlet部分代码文章来源地址https://www.toymoban.com/news/detail-508773.html

package com.smrsar.servlet;

import com.smrsar.bean.Userz;
import com.smrsar.util.JDBCUtil;
//import com.smrsar.util.JDBCUtil;


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.sql.*;

@WebServlet("/login")//使用这种方式可以不在xml文件中配置Servlet类也能实现跳转
public class Login extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //设置编码
        req.setCharacterEncoding("utf-8");
        resp.setCharacterEncoding("utf-8");
        resp.setContentType("ext/html;charset=UTF-8");
        //请求获取数据
        String username = req.getParameter("username");
        String password = req.getParameter("password");

        Connection con = null;
        PreparedStatement pstm = null;
        ResultSet rs = null;
        Userz login = null;
        try {
            //调用已编写的JDBC工具类内容
            con = JDBCUtil.GetCon();
            //定义sql语句
            String sql = "select * from ta_user where username=? and password=?";
           //获取预处理对象
            pstm = con.prepareStatement(sql);
            //传参
            pstm.setObject(1, username);
            pstm.setObject(2, password);
            //执行查询
            rs = pstm.executeQuery();

            if (rs.next()) {
                login = new Userz();
                login.setUid(rs.getInt("uid"));
                login.setUsername(rs.getString("username"));
                login.setPassword(rs.getString("password"));
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //调用已编写的JDBC工具类内容
            JDBCUtil.Close(rs, pstm, con);

        }
        //判断是否为空，跳转到对应页面
        if (login != null) {
            resp.sendRedirect("goods.jsp");
        } else {
            resp.sendRedirect("error.jsp");
        }
    }
}

package com.smrsar.servlet;

import com.smrsar.bean.User;
import com.smrsar.dao.UserDaoImpl;
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;

@WebServlet("/register")
public class Register extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1,设置编码
        req.setCharacterEncoding("utf-8");
        resp.setCharacterEncoding("utf-8");
        resp.setContentType("ext/html;charset=UTF-8");

        //2,获取请求参数
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        String phone = req.getParameter("phone");
        String address = req.getParameter("address");

        //3，封装，把前面的变量封装到User对象中
        User user = new User();
        user.setUsername(username);
        user.setPassword(password);
        user.setPhone(phone);
        user.setAddress(address);

        System.out.println(user);

        //4,实例化对象后调用使用
        UserDaoImpl userDao=new UserDaoImpl();
        int row=userDao.register(user);

        //5，作出响应
        if (row > 0) {
            //成功跳转到登录页面
            resp.sendRedirect("login.jsp");
        } else {
            //注册失败跳转到注册页
            resp.sendRedirect("register.jsp");
        }
    }
}

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