基于ssm完成简单项目完成用户登录功能

1 项目环境搭建请看上篇博客

2 需求分析：

1 用户在登录页面输入用户名和密码进行数据库校验检验成功则进入成功页面失败则返回登录页面

3 准备工作

1 新建数据库bishe 在此数据库下新建user表

2 在entity包下新建User类

package com.m.entity;
public class User {
	private  int id;
	private String username;
	private String  password;
	
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	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;
	}
}

4 修改UserController类

package com.m.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.m.entity.User;
import com.m.service.UserService;
@Controller
public class UserController {
	@Autowired  //注入service
	private UserService userService; 
	
	/**
	 * 请求路径/user/login
	 * @param user
	 * @return
	 */
	@RequestMapping("/user/login")
	public String login(User user){
		User us =userService.login(user); 
		if(us!=null){
			return "success";
		}else{
			return "login";
		}
	}		
}

4 新建UserService接口

package com.m.service;

import com.m.entity.User;
public interface UserService {
	User login(User user);
}

5 新建UsServiceImpl 实现UserService接口

package com.m.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.m.entity.User;
import com.m.mapper.UserMapper;
import com.m.service.UserService;
@Service
public class UserServiceImpl  implements UserService{
 /**
  * 注入mapper接口	
  */
	@Autowired
	private UserMapper userMapper;
	@Override
        public User login(User user) {
	    return userMapper.login(user);
    } 
}

6 新建UserMapper接口

package com.m.mapper;
import com.m.entity.User;
public interface UserMapper {	
	User login(User user);
}

7 在src/main/resources 下创建mapper 文件夹在该文件夹下新建UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>  
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" 
"http://mybatis.org/dtd/mybatis-3-mapper.dtd" >

<mapper namespace="com.m.mapper.UserMapper">
<select id="login" parameterType="com.m.entity.User" resultType="com.m.entity.User">
	select username ,password from user where username =#{username} and password =#{password}
</select>
</mapper>

8 新建login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/user/login">
用户名：<input type="text" name="username"></input>
密码：<input type="text" name="password"></input>
<input type="submit" value="登录">
</form>
</body>
</html>

9 在数据库user表中插入一条数据用户名 zhangsan 密码123

10 页面测试运行截图：

登陆成功跳转到success.jsp页面

密码不正确则进入login.jsp

’

至此简单的用户登录小案例就完成了。

基于ssm完成简单项目完成用户登录功能

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