会话—cookie

 1 package com.yyz.cookie;
 2 
 3 import java.io.IOException;
 4 import java.io.PrintWriter;
 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 CookieDemo extends HttpServlet {
14     // 网站首页：可以实现显示用户上次访问时间
15     public void doGet(HttpServletRequest request, HttpServletResponse response)
16             throws ServletException, IOException {
17         response.setContentType("text/html;charset=UTF-8");
18         PrintWriter out = response.getWriter();
19         out.write("这是网站首页！！<br><br>");
20         out.write("您上次访问的时间是：");
21         // 得到上次访问时间
22         Cookie[] cookies = request.getCookies();
23         for (int i = 0; cookies != null && i < cookies.length; i++) {
24             Cookie cookie = cookies[i];
25             if (cookie.getName().equals("lastAccessTime")) {
26                 Long time = Long.parseLong(cookie.getValue());
27                 Date d = new Date(time);
28                 out.write(d.toLocaleString());
29             }
30         }
31         // 给用户以cookie的形式送最新的时间
32         Cookie cookie = new Cookie("lastAccessTime", System.currentTimeMillis()
33                 + "");
34         cookie.setMaxAge(10000);
35         response.addCookie(cookie);
36 
37     }
38 
39     public void doPost(HttpServletRequest request, HttpServletResponse response)
40             throws ServletException, IOException {
41 
42         doGet(request, response);
43     }
44 
45 }