利用Cookie机制计算访问次数

利用Cookie机制计算访问次数

package com.msb.cookies;

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.net.CookieStore;
//这里必须访问Demo1.do才有效果哦：http://localhost:8090/ProjectCookies_war_exploded/Demo1.do
@WebServlet(urlPatterns = "/Demo1.do")
public class Demo1 extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        /*Cookie age = new Cookie("age", "23");
        Cookie name = new Cookie("name", "Mick");
        age.setMaxAge(60);//设置cookie的存活时间；在60秒内再次打开浏览器cookie不会清空；即：即使退出账号也可以登录

        resp.addCookie(age);
        resp.addCookie(name);*/
        //获取cookie
        Cookie[] cookies = req.getCookies();
        boolean falg = true;
        if(cookies!=null){
            for (Cookie cookie : cookies) {
                /* 获取文件的名字；然后判断名称出现的次数*/
                String name1 = cookie.getName();
                if ("Demo1".equals(name1)) {

                    //cookie.getValue()第一次获取为一；这里注意Cookie第一次加载无cookie信息；则当出现cookie时其实已经是第二次访问
                    //Integer.parseInt（——String——）--将字符串转成包装类
                    Integer value = Integer.parseInt(cookie.getValue()) + 1;
                    //String.valueOf(i)；将包装类转成字符串  --new Cookie("Demo1", ”Demo1“);
                    //这里是定义的一个cookie类型；用它来测试出现次数
                    Cookie name11 = new Cookie("Demo1", String.valueOf(value));
                    //将这个cooki生成的对象捕获；添加到cookie队列中；
                    resp.addCookie(name11);
                    System.out.println("欢迎第" + value + "次访问");
                    falg = false;
                }
            }
           if (falg){
               System.out.println("您是第1次访问");
               Cookie demo1 = new Cookie("Demo1", "1");
               resp.addCookie(demo1);
            }
        }
    }
}