Cookie的設定

當程式第一次載入是不會有cookie；HttpSession會記錄訪問將cookie的id和對應的服務返回形成cookie

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;

@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");
        name.setMaxAge(60);//設定cookie的存活時間；在60秒內再次開啟瀏覽器cookie不會清空；即：即使退出賬號也可以登入

        resp.addCookie(age);
        resp.addCookie(name);
        //獲取cookie
        Cookie[] cookies = req.getCookies();
        if(cookies!=null){
            for (Cookie cookie : cookies) {
                System.out.println(cookie.getName()+"="+cookie.getValue());
            }
        }
    }
}