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1 package example;
2
3 import java.io.PrintWriter  ;
4 import java.io.IOException ;
5
6 import javax.persistence.*;
7
8 import javax.servlet.ServletException ;
9
10 import javax.servlet.http.HttpServlet ;
11 import javax.servlet.http.HttpSession ;
12 import javax.servlet.http.HttpServletRequest ;
13 import javax.servlet.http.HttpServletResponse ;
14
15 public class SessionServlet extends HttpServlet {
16 @PersistenceContext(name="example")
17 private EntityManager _manager;
18
19
22 public void setEntityManager(EntityManager manager)
23 {
24 _manager = manager;
25 }
26
27
30 public void service(HttpServletRequest request,
31 HttpServletResponse response)
32 throws IOException , ServletException
33 {
34 response.setContentType("text/html");
35
36 PrintWriter out = response.getWriter();
37
38 HttpSession session = request.getSession();
39
40 User user = (User) session.getAttribute("user");
41
42 if (user != null) {
43 out.println("User: " + user.getName() + "<br>");
44 out.println("Quest: " + user.getQuest() + "<br>");
45 out.println("Favorite color: " + user.getColor() + "<br>");
46 return;
47 }
48
49 String name = request.getParameter("name");
50 String quest = request.getParameter("quest");
51 String color = request.getParameter("color");
52
53 if (name == null || name.equals("")) {
54 out.println("<form action='session'>");
55 out.println("What is your name? <input name='name'></input><br>");
56 out.println("What is your quest? <input name='quest'></input><br>");
57 out.println("What is your favorite color? <input name='color'></input><br>");
58 out.println("</form>");
59 return;
60 }
61
62 user = new User(name, quest, color);
63
64 _manager.persist(user);
65
66 session.setAttribute("user", user);
67
68 out.println("<a HREF='session'>You may pass.</a>");
69 }
70 }
71 |
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Java API By Example, From Geeks To Geeks.