Cookie案例——记录网站上一次访问时间-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_41988628/article/details/104852214

本文通过案例介绍如何使用Java的TimeServlet实现Cookie功能，记录用户每次访问网站的时间，展示从上次访问到本次访问的时间间隔。

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TimeServlet.java

package net.pp.cookie;

import com.sun.istack.internal.localization.NullLocalizable;

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.text.SimpleDateFormat;
import java.util.Date;

@WebServlet(name = "TimeServlet", urlPatterns = "/time")
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 {

        //记录访问时间并通过cookie加入到响应头
        Date date = new Date();
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy/MM/dd-hh:mm:ss");//格式化时间
        String time = simpleDateFormat.format(date);
        Cookie cookie = new Cookie("time", time);
        cookie.setMaxAge(60*60*24);
        response.addCookie(cookie);
        response.setContentType("text/html;charset=utf-8");

        //获取客户端浏览器发送过来的cookie数据
        Cookie[] cookies = request.getCookies();
        String timeValue = null;
        for (Cookie cookie1 : cookies){
            if(cookie1.getName().equals("time")){
                timeValue = cookie1.getValue();
            }
            }
        if(timeValue==null){
            response.getWriter().write("欢迎您访问我们的网站");
        }else{
            response.getWriter().write("您上次访问网站的时间是：" + timeValue);//像浏览器返回数据
        }
    }
}

第一次访问结果：