cookie应用之显示当前时间，上次时间

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package com.neuedu.servlet;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.io.PrintWriter;import java.text.SimpleDateFormat;import java.util.Date;/** * Created by Administrator on 2016/11/28 0028. */@WebServlet(name = "timeServlet",urlPatterns = "/lasttime")public class timeServlet extends HttpServlet{    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException    {    }    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException    {        response.setContentType("text/html;charset=utf-8");        response.setCharacterEncoding("utf-8");        //取得当前时间字符串        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");        String curdate=sdf.format(new Date());        PrintWriter pw=response.getWriter();        Cookie [] cookies=request.getCookies();        String strtime="";        boolean isfirstvisit=true;//假定当前是第一次访问        if(cookies!=null){            for(Cookie c:cookies){                //看cookie中是否含有名称是lasttime的cookie，如果有，不是第一次访问（之前设置过这个cookie了）                //如果循环一圈都没有发现名称是lasttime的cookie，说明是第一次访问                if("lasttime".equals(c.getName())){                    isfirstvisit=false;                    strtime=c.getValue();                }            }        }        //将当前时间保存到cookie中        Cookie c=new Cookie("lasttime",curdate);        response.addCookie(c);        if(!isfirstvisit){            pw.print("上次访问时间是"+curdate);            pw.print("当前时间是"+strtime);        }        else {            pw.print("当前时间是"+curdate);        }    }}
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