Cookie 记录最后访问时间

时间：2024-04-29 07:26:53
 package cn.gs.ly.servlet;

 import java.io.IOException;

 import java.io.PrintWriter;

 import java.util.Date;

 import javax.servlet.ServletException;

 import javax.servlet.http.Cookie;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 public class LastVisitTimeServlet extends HttpServlet {

     @Override

     protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

         resp.setContentType("text/html; charset=UTF-8");        

         PrintWriter out = resp.getWriter();

         out.print("您上次访问的时间是：");

         //先获取cookie  再赋值

         Cookie [] co = req.getCookies();//所有 Cookie 对象的数组

         for(int i=0;co!=null&&i<co.length;i++){ //遍历cookie数组

             if("last_time".equals(co[i].getName())){//获取cookie名

                 String value = co[i].getValue(); //获取cookie值

                 long time = Long.parseLong(value); //转换cookie值类型

                 out.println(new Date(time).toLocaleString());//显示cookie里的最后一次系统时间

             }

         }

         //先查看cookie的最后时间并显示。再获取现在系统当前时间

         long time = System.currentTimeMillis();

         Cookie c = new Cookie("last_time",time+"");//构造带指定名称和值的 cookie。

         c.setMaxAge(30*24*60*60);//cookie存活时间

         c.setPath(req.getContextPath()); //在当前应用有效 s.setPath("/");

         resp.addCookie(c);//添加cookie

     }

     @Override

     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

         this.doPost(req, resp);

     }

 }

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