Cookie案例-显示用户的上次访问时间代码实现

1 案例分析

2 Java实现代码

 1 public class LastAccessTimeServlet extends HttpServlet {
 2     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws Exception {
 3         
 4         //Response 乱码问题的解决
 5         response.setContentType("text/html;charset=UTF-8");
 6         
 7         //获得当前时间
 8         Date date=new Date();
 9         SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
10         String currentTime=format.format(date);
11         
12         //1 创建cookie记录最新的当前访问时间
13         Cookie cookie=new Cookie("lastAccessTime", currentTime);
14         cookie.setMaxAge(60*60);
15         response.addCookie(cookie);
16         //2 获得客户端携带的cookie----lastAccessTime
17         String lastAccessTime=null;
18         Cookie[] cookies=request.getCookies();
19         if(cookies!=null){
20             for (Cookie coo : cookies) {
21                 if ("lastAccessTime".equals(coo.getName())) {
22                     lastAccessTime=coo.getValue();
23                 }
24             }
25         }
26         //3判断是第几次访问
27         if (lastAccessTime==null) {
28             response.getWriter().write("您是第一次访问");
29         } else {
30             response.getWriter().write("您上次访问时间是："+lastAccessTime);
31         }
32     }
33     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws Exception {
34         doGet(request, response);
35     }
36 }