public void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        // 1.创建cookie

        Cookie cookie = new Cookie("computer", "alienware");

        Cookie cookie2 = new Cookie("phone", "apple");

        //cookie可以设置最大的存活时间

        cookie.setMaxAge(3600);

        cookie2.setPath("/four_test");

        // 2.将cookie发送给浏览器

        response.addCookie(cookie);

        response.addCookie(cookie2);

        /* response.setHeader("Set-Cookie", "computer=alienware"); */

        // 3.获取cookie

        Cookie[] cookies = request.getCookies();

        if (cookies != null && cookies.length > 0) {

            for (Cookie coo : cookies) {

                System.out.println(coo.getName()+"--->"+coo.getValue());

            }

        }

        //注意：

        //1.cookie第一次是由servlet发送到浏览器中，第一次不能获取cookie

        //2.不同的浏览器存放的cookie不是同一个

        //3.如果设置了cookie的maxage，则cookie会保存在浏览器所在电脑的硬盘上，如果没设置该属性，则保存在浏览器的内存中

    }

public void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        //1.创建session/获取当前session

        HttpSession session = request.getSession();

        System.out.println(session.getId());

        //2.设置session的最大不活跃时间

        session.setMaxInactiveInterval(1800); //second

        //3.session存储用户信息

        session.setAttribute("name", "zhangsan");

        //4.立即销毁session

        //session.invalidate();

    }