【会话技术】Cookie技术 案例：访问时间

 1 package cookie;
 2 
 3 import java.io.IOException;
 4 import java.text.SimpleDateFormat;
 5 import java.util.Date;
 6 
 7 import javax.servlet.ServletException;
 8 import javax.servlet.http.Cookie;
 9 import javax.servlet.http.HttpServlet;
10 import javax.servlet.http.HttpServletRequest;
11 import javax.servlet.http.HttpServletResponse;
12 
13 public class LastAccessTimeServlet extends HttpServlet {
14 
15     protected void doGet(HttpServletRequest request, HttpServletResponse response)
16             throws ServletException, IOException {
17         
18         Date date = new Date();
19         SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd/hh:mm:ss");
20         String currentTime = format.format(date);
21         
22         Cookie cookie = new Cookie("lastAccessTime",currentTime);
23         cookie.setMaxAge(60*10*500);
24         response.addCookie(cookie);
25         
26         String lastAccessTime = null;
27         Cookie[] cookies = request.getCookies();
28         if(cookies!=null){
29             for(Cookie coo : cookies){
30                 if("lastAccessTime".equals(coo.getName())){
31                     lastAccessTime = coo.getValue();
32                 }
33             }
34         }
35         
36         response.setContentType("text/html;charset=UTF-8");
37         if(lastAccessTime==null){
38             response.getWriter().write("您第一次访问");
39         }else{
40             response.getWriter().write("上次访问时间："+lastAccessTime);
41         }
42         
43     }
44 
45     protected void doPost(HttpServletRequest request, HttpServletResponse response)
46             throws ServletException, IOException {
47         doGet(request, response);
48     }
49 }