@ WebServlet ("/login. Do ")
Public class UserLoginServlet extends the HttpServlet {
@ Override
Protected void doGet (it the req, HttpServletResponse resp) throws ServletException, IOException {
Enclosing the doPost (the req, resp);
}

@ Override
Protected void doPost (it the req, HttpServletResponse resp) throws ServletException, IOException {
String username=the req. GetParameter (" username ");
String userpwd=the req. GetParameter (" userpwd ");
Try {
UserLoginService UserLoginService=new UserLoginServiceImpl ();
The Users Users=userLoginService. UserLogin (username, userpwd);
//set up the client and server session state
The HttpSession session.=the req getSession ();
Session. SetAttribute (the USER_SESSION_KEY, users).
//using redirects to jump a homepage
Resp. SendRedirect (" main. JSP ");
} the catch (UserNotFoundException e) {
The req. SetAttribute (" MSG ", um participant etMessage ());
The req. GetRequestDispatcher (" login. JSP "). The forward (the req, resp);
} the catch (Exception e) {
Resp. SendRedirect (" error. JSP ");
}
}
}

CodePudding user response:

Light was not apparent to the code can not use the correct user name and password to log in

CodePudding user response:

Backend servlet interrupt point debugged, receives the username, userpwd is valid,
Page opening on F12 debugging, see if the Network and the Console is wrong,

CodePudding user response:

Background type breakpoints, step by step, look at where an error