Cookie_live.java

package cn.web.cookie;

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;

@WebServlet("/cookie_live")
public class Cookie_live extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.创建Cookie对象
        Cookie c1 = new Cookie("msg", "setMaxAge");

        //2.设置cookie的存活时间
        c1.setMaxAge(30);//将cookie持久化到硬盘，30秒后会自动删除cookie文件
        //c1.setMaxAge(-1); //默认值
        //c1.setMaxAge(0);//删除Cookie

        resp.addCookie(c1);
    }

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