It is several files

Log in the background of the code is very simple
The controller of the

//login check 
@ RequestMapping ("/" the doLogin) 
Public String the doLogin (Model Model, User User) {
If (userService. The doLogin (user)) {
Return the "main"; 
} 
The else {
Model. The addAttribute (" MSG ", "user name or password mistake, please check!" ); 
Return "login"; 
} 
} 

The dao interface

 
Public interface UserDao {
//login check 
Public User the doLogin (User User); 
//user registration 
Public Integer doRegister (User User); 
} 

Dao. XML

 & lt; Mapper namespace="com. Wh. Dao. UserDao" & gt; 
SELECT * FROM the user WHERE the uname=# # {uname} and PWD={PWD} 
 

INSERT INTO USER VALUES (uname, PWD) (# # {uname}, {PWD}) 
 
 

Service

 @autowired 
Private UserDao UserDao; 

//login check 
Public Boolean the doLogin (User User) {
The User user1=userDao. The doLogin (User); 
If (user1==null) {
return false; 
} 
The else {
return true; 
} 
} 

What to add to use single box role to judge login to different pages