JSP-2020年4月14日-第七周

注册页面（regist.jsp）

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <form action="doregist.jsp" method="post">
        账号：<input type="text" name="username"><br>
        密码：<input type="password" name="password"><br>
        <input type="submit" value="注册">
    </form>
</body>
</html>

注册处理（doregist.jsp）

<%@ page import="main.java.DAO.UserDAO" %>
<%@ page import="main.java.entity.UserBean" %>
<%@ page import="java.io.PrintWriter" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<%
    String username = request.getParameter("username");
    String password = request.getParameter("password");

    //注册功能
    UserBean userBean = new UserBean();
    userBean.setUsername(username);
    userBean.setPassword(password);

    UserDAO userDAO = new UserDAO();
    Integer result = userDAO.insert(userBean);
    System.out.println(result);
    if (result>0){//注册成功
        response.sendRedirect("success.jsp");//跳转至成功页面
    }
%>
</body>
</html>

注册成功（success.jsp）

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
注册成功
</body>
</html>

JavaBean（UserBean）

package main.java.entity;

public class UserBean {
    private int uid;
    private String username;
    private String password;

    @Override
    public String toString() {
        return "entity.UserBean{" +
                "uid=" + uid +
                ", username='" + username + ''' +
                ", password='" + password + ''' +
                '}';
    }

    public UserBean() {
    }

    public UserBean(int uid, String username, String password) {
        this.uid = uid;
        this.username = username;
        this.password = password;
    }

    public int getUid() {
        return uid;
    }

    public void setUid(int 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;
    }
}

DAO层（UserDAO）

package main.java.DAO;



import main.java.entity.UserBean;
import main.java.util.DBUtils;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class UserDAO {
    //新增
    public int insert(UserBean userBean) {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        String sql = "insert into tb_user(username,password)value(?,?)";
        try {
            connection = DBUtils.getConnection();
            preparedStatement = connection.prepareStatement(sql);

            preparedStatement.setString(1,userBean.getUsername());
            preparedStatement.setString(2,userBean.getPassword());

            Integer result = preparedStatement.executeUpdate();
            return result;
        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            DBUtils.closeAll(connection,preparedStatement,null);
        }
        return 0;
    }
}

补充：

数据库

# 建库
create database jsp;
use jsp;
# 建表
create table tb_user(
                        uid int(10) primary key auto_increment,
                        username varchar(10) not null ,
                        password varchar(10) not null
)default charset utf8;

工具类（DBUtils）

package main.java.util;

import javax.swing.plaf.nimbus.State;
import java.sql.*;

public class DBUtils {
    static {
        try {
            //1、加载驱动
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
    //2、获得连接
    public static Connection getConnection() throws SQLException {
        Connection connection = null;
        connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/jsp","root","root");
        return connection;
    }
    //3、关闭连接
    public static void closeAll(Connection connection, Statement statement, ResultSet resultSet){
        try{
            if (resultSet!=null){resultSet.close();}
            if (statement!=null){statement.close();}
            if (connection!=null){connection.close();}
        }catch (SQLException e){
            e.printStackTrace();
        }
    }
}