package com.ask.cookie;
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.sql.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;
 
 //显示用户上次访问的时间;
 public class CookieTime extends HttpServlet{
 @Override
 protected void service(HttpServletRequest req, HttpServletResponse resp)
 throws ServletException, IOException {
 //设置字体格式
 req.setCharacterEncoding("utf-8");
 resp.setCharacterEncoding("utf-8");
 resp.setContentType("text/html;charset=utf-8");
 //存入当前时间;
 Cookie cookie=new Cookie("lastAccessTime", System.currentTimeMillis()+"");
 //将cookie交给response对象响应到浏览器中
 resp.addCookie(cookie);
 PrintWriter out=resp.getWriter();
 String time="";
 Cookie[] cookies=req.getCookies();
 for (Cookie cookie2 : cookies) {
 if("lastAccessTime".equals(cookie2.getName())){
 time=cookie2.getValue();
 long times=Long.parseLong(time);
 Date date=new Date(times);
 out.print("你当前的访问时间是: "+date);
 }
 }
 }
 }
 2.web.xml配置文件如下：
 <!-- 获得时间 -->
 <servlet>
 <servlet-name>CookieTime</servlet-name>
 <servlet-class>com.ask.cookie.CookieTime</servlet-class>
 </servlet>
 <servlet-mapping>
 <servlet-name>CookieTime</servlet-name>
 <url-pattern>/CookieTime</url-pattern>
 </servlet-mapping>