ssm的搭建见上一章

1.数据协议层

public User selectByLoginnameAndPassword(@Param("loginname")String loginname,@Param("password") String password);

2.服务协议层

 User login(String loginname,String password);

3.服务层

@Autowiredprivate UserDao userDao;public User login(String loginname, String password) {        return userDao.selectByLoginnameAndPassword(loginname, password);	}

4.数据实现层(mybatis)

      
        select * from user_inf where loginname=#{loginname} and password=#{password}
     

5.控制层

@Controllerpublic class UserController {	@Autowired	private UserService userServcie;	@RequestMapping("/checklogin")	@ResponseBody   public User checklogin( String loginname,String paasword,HttpSession session){		System.out.println(loginname);		User user =userServcie.login(loginname, paasword);		if(user!=null) {			session.setAttribute("user_session", user);			return user;		}else {			return null;		}				}

后台搭建结束

6.前台搭建

ajax异步登陆