cookie小项目实战

最近看视频学习Java的cookie,跟着视频实战一下

package com.rule1.cookie.web;

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 javax.xml.crypto.Data;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

@WebServlet("/cookieServlet")
public class cookieServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //设置响应内容形式
        response.setContentType("text/html;charset=utf-8");
        boolean flag=false;
        //获取cookie
        Cookie[] cookies = request.getCookies();
        if (cookies!=null&&cookies.length>0){
            //遍历找到需要的cookie
            for (Cookie cookie : cookies) {
                String name = cookie.getName();
                if ("lastTime".equals(name)){
                    //获取cookie的值
                    String value = cookie.getValue();
                    response.getWriter().write("欢迎回来上次您的登录时间为:"+value);
                    //重新设置cookie

                    Date date = new Date();
                    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy年MM月dd日hh:mm:ss");
                    value = simpleDateFormat.format(date);
                    cookie.setValue(value);
                    flag=true;
                    cookie.setMaxAge(60*60*24*30);
                    response.addCookie(cookie);
                    break;
                }

            }
        }
        //首次访问设置cookie
        if (cookies==null||cookies.length==0||flag==false){
            //获取时间设置cookie
            Date date = new Date();
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy年MM月dd日hh:mm:ss");
            String value = simpleDateFormat.format(date);
            Cookie lastTime = new Cookie("lastTime", value);
            System.out.println("lastTime"+value);
            flag=true;
            lastTime.setMaxAge(60*60*24*30);
            response.addCookie(lastTime);
            response.getWriter().write("你是首次登录");


        }
    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

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