1    package net.server.servlets; 
2     
3    import javax.servlet.ServletException; 
4    import javax.servlet.http.*; 
5    import java.io.IOException; 
6    import java.io.PrintWriter; 
7     
8    /** 
9     * Login Class 
10    */ 
11    
12   public class Login extends HttpServlet { 
13    
14       /** 
15        * First call to this sevlet retuns the Login Page. Subsequent calls 
16        * validate the userId and password. If entries are valid then the 
17        * process is redirected to FormC Servlet 
18        * @throws    IOException ServletException 
19        */ 
20    
21       public void doGet(HttpServletRequest request, 
22                         HttpServletResponse response) 
23               throws IOException, ServletException { 
24    
25           response.setContentType("text/html"); 
26           PrintWriter out = response.getWriter(); 
27    
28           HttpSession session = request.getSession(true); 
29           LoginProcess login = (LoginProcess) session.getValue("login"); 
30    
31           if (session.isNew() || login == null) { 
32               login = new LoginProcess(); 
33    
34               Cookie loginCookie = new Cookie("Login", "LoginPage"); 
35               response.addCookie(loginCookie); 
36    
37               session.putValue("login", login); 
38               out.println(login.getLoginPage()); 
39           } else { 
40               String user = request.getParameter("txtUserId"); 
41               String password = request.getParameter("txtPassword"); 
42    
43               System.out.println("\n Cookie Example"); 
44               System.out.println("\n Cookie Login = " + 
45                       RequestUtil.getCookieValue(request.getCookies(), "Login")); 
46    
47               if (login.isValid(user, password)) { 
48                   session.putValue("userId", user); 
49                   session.putValue("nextAction", "FormC"); 
50                   response.sendRedirect(login.getLoginRedirectURL()); 
51               } else { 
52                   out.println(login.getLoginErrorPage()); 
53               } 
54           } 
55       } 
56    
57    
58       /** 
59        * Calls doGet() method 
60        * 
61        * @throws    IOException ServletException 
62        */ 
63    
64       public void doPost(HttpServletRequest request, 
65                          HttpServletResponse response) 
66               throws IOException, ServletException { 
67    
68           doGet(request, response); 
69    
70       } 
71    
72   } 
73    
74    
75    
76