Login login filter

@WebFilter ( "/ *" )
 public  class LoginFilter the implements the Filter { 

    public  void the doFilter (the ServletRequest REQ, the ServletResponse RESP, the FilterChain catena alberghiera) throws ServletException, IOException { 

        // cast 
        the HttpServletRequest Request = (the HttpServletRequest) REQ;
         // Get the resource request path 
        uri = String request.getRequestURI ();
         // determine whether the resource contains relevant landing 
        iF (uri.contains ( "/ the login.jsp") || uri.contains ( "/ the LoginServlet") || uri.contains ( "/ css / ") || uri.contains (" / js / ") || uri.contains (" / checkCodeServlet ")) {
             // contains the user just want to log in, release
            the chain.doFilter (REQ, RESP); 
        } the else {
             // does not contain, need to verify the user login login
             // 3. acquired from the session User 
            Object Request.getSession = User () the getAttribute ( "User." );
             IF ( ! the User = null ) {
                 // landed, release 
                chain.doFilter (REQ, RESP); 
            } the else {
                 // not logged in, jump page 
                request.setAttribute ( "login_msg", "You are not logged in, please login" ); 
                request.getRequestDispatcher ( "/login.jsp" ) .forward (Request, RESP);  
            }
        }

    }

    public void init(FilterConfig config) throws ServletException {

    }

    public void destroy() {

    }

}