1 package cn.gs.ly.servlet;
2 import java.io.IOException;
3 import java.io.PrintWriter;
4 import java.util.Date;
5
6 import javax.servlet.ServletException;
7 import javax.servlet.http.Cookie;
8 import javax.servlet.http.HttpServlet;
9 import javax.servlet.http.HttpServletRequest;
10 import javax.servlet.http.HttpServletResponse;
11
12 public class LastVisitTimeServlet extends HttpServlet {
13 @Override
14 protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
15 resp.setContentType("text/html; charset=UTF-8");
16
17 PrintWriter out = resp.getWriter();
18 out.print("您上次访问的时间是：");
19 //先获取cookie 再赋值
20 Cookie [] co = req.getCookies();//所有 Cookie 对象的数组
21 for(int i=0;co!=null&&i<co.length;i++){ //遍历cookie数组
22 if("last_time".equals(co[i].getName())){//获取cookie名
23 String value = co[i].getValue(); //获取cookie值
24 long time = Long.parseLong(value); //转换cookie值类型
25 out.println(new Date(time).toLocaleString());//显示cookie里的最后一次系统时间
26 }
27 }
28
29 //先查看cookie的最后时间并显示。再获取现在系统当前时间
30 long time = System.currentTimeMillis();
31 Cookie c = new Cookie("last_time",time+"");//构造带指定名称和值的 cookie。
32 c.setMaxAge(30*24*60*60);//cookie存活时间
33 c.setPath(req.getContextPath()); //在当前应用有效 s.setPath("/");
34 resp.addCookie(c);//添加cookie
35 }
36 @Override
37 protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
38 this.doPost(req, resp);
39 }
40 }
