ssm 登录功能

User类

package com.lyc.pojo;

import lombok.Data;

@Data
public class User {
    private int id;
    private String count;
    private String password;
}

UserMapper

public interface UserMapper {
        //用户登录
    User loginUser(User user);
}

UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.lyc.mapper.UserMapper">
        <select id="loginUser" resultType="com.lyc.pojo.User" parameterType="com.lyc.pojo.User">
        select * from ssmbuild.user where count = #{count} and password = #{password}
    </select>
</mapper>

UserService

public interface UserService {
        //用户登录
    User loginUser(User user);
}

UserServiceImpl

public class UserServiceImpl implements UserService{
    private UserMapper userMapper;
    public void setUserMapper(UserMapper userMapper) {
        this.userMapper = userMapper;
    }
        @Override
    public User loginUser(User user) {
        return userMapper.loginUser(user);
    }

Controller

@Controller
@RequestMapping("/user")
public class LoginController {
    @Autowired
    private UserService userService;
        //跳转到登录页面
    @RequestMapping("/jumplogin")
    public String jumpLogin()throws Exception{
        return "login";
    }
    
        //用户登录
    @RequestMapping("/login")
    public String login(User user, HttpServletRequest req, ModelAndView modelAndView, HttpSession session){
        User login = userService.loginUser(user);
        if (login!=null){
            req.getSession().setAttribute("login", login);
        return "success";
        }else{
            modelAndView.setViewName("login");
            return "fail";
        }
    }
}
    //退出登录
    @RequestMapping("/logout")
    public String logout(HttpSession session)throws Exception{
        //session 过期
        session.invalidate();
        return "login";
    }
}

jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <link rel="stylesheet" href="../../static/layui-v2.6.4/layui/css/layui.css" media="all">
    <script src="../../static/layui-v2.6.4/layui/layui.js" charset="utf-8"></script>
    <title>登录</title>
</head>
<style>
    body{
        background-color: #cdc1c1;
    }
    form{
        background-color: #f1eeee;
         360px;
        height: 200px;
        padding: 10px;
        margin: 10px auto;
    }
</style>
<body>
<form class="layui-form" action="/user/login" onsubmit="return check()">
    <div class="layui-form-item">
        <label class="layui-form-label layui-icon layui-icon-user"></label>
        <div class="layui-input-inline">
            <input type="text" name="count" required  lay-verify="required" placeholder="请输入用户名" autocomplete="off" class="layui-input ">
        </div>
    </div>
    <div class="layui-form-item">
        <label class="layui-form-label layui-icon layui-icon-password"></label>
        <div class="layui-input-inline">
            <input type="password" name="password" required lay-verify="required" placeholder="请输入密码" autocomplete="off" class="layui-input">
        </div>
    </div>
    <div class="layui-form-item">
        <div class="layui-input-block">
            <button class="layui-btn" lay-submit lay-filter="formDemo">立即提交</button>
            <button type="reset" class="layui-btn layui-btn-primary">重置</button>
        </div>
    </div>
</form>
</body>
</html>

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原文地址：https://www.cnblogs.com/liuyunche/p/14704918.html