【JavaWeb】登陆页面

java登陆页面

public class User {
    private Integer id;
    private String username;
    private String password;

    public Integer getId() {
        return id;
    }

    public String getUsername() {
        return username;
    }

    public String getPassword() {
        return password;
    }

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

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString(){
        return "User{"+"id="+ id +". username='"+ username + '\'' +"}";
    }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

<dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.5</version>
</dependency>

<dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.34</version>
</dependency>
1
2
3
4
5
6
7
8
9
10
11

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!--起别名-->
    <typeAliases>
        <package name="com.lyp"/>
    </typeAliases>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://www.123456.com:8086/db1?useSSL=false&amp;useServerPrepStmts=true"/>
                <property name="username" value="admin"/>
                <property name="password" value="123456"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <!--扫描mapper-->
        <package name="com.lyp"/>
    </mappers>
</configuration>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

html表单

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>login</title>
</head>
<body>
<form action="/Tomcat-demo/loginServlet" method="get" id="form">
    <h1 id="login-Msg"> LOGIN IN </h1>
    <p>Username: <input id="username" name="username" type="text"></p>
    <p>Password: <input id="password" name="password" type="text"></p>

    <input type="submit" value="login up"><br>
    <input type="reset" value="reset"><br>
    <a herf="register.html">没有账号？点击注册</a>

</form>
</body>
</html>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19

登陆

package com.lyp.web;

public class User {
    private Integer id;
    private String username;
    private String password;

    public Integer getId() {
        return id;
    }

    public String getUsername() {
        return username;
    }

    public String getPassword() {
        return password;
    }

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

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString(){
        return "User{"+"id="+ id +". username='"+ username + '\'' +"}";
    }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

package com.web;

import com.lyp.mapper.UserMapper;
import com.lyp.web.User;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

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.io.InputStream;
import java.io.PrintWriter;

@WebServlet("/loginServlet")
public class loginServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.接收用户名和密码
        String username = request.getParameter("username");
        String password = request.getParameter("password");

        //2.调用MyBatis完成查询
        //2.1 获取SqlSessionFactory对象
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        //2.2 获取SqlSession对象
        SqlSession sqlSession = sqlSessionFactory.openSession();

        //2.3 获取Mapper
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

        //2.4 调用方法
        User user = userMapper.select(username,password);

        //2.5 释放资源
        sqlSession.close();

        //获取字符输出流，并设置ContentType
        response.setContentType("text/html;charset=utf-8");
        PrintWriter writer = response.getWriter();
        //3.判断User是否为null
        if (user != null){
            //登陆成功
            writer.write("登陆成功");
        }else {
            //登陆失败
            writer.write("登陆失败");
        }
    }

}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56

相关阅读:
Spring Boot多数据源配置运行报错：No operations allowed after connection closed连接异常的解决
 Python【英雄购买界面】
软考——软件工程基础知识
 DOM 重点核心
 回顾总结之数据结构：3 链表
 从积木式到装配式云原生安全
 算法综合篇专题三:二分法
 深度操作系统20.5发布 deepin 20.5更新内容汇总
 如何在nginx上设置html不缓存
 使用watch和tail命令监控文件内容的变化
原文地址：https://blog.csdn.net/weixin_51614272/article/details/125624029