会话技术_Cookie_细节1_发送多个Cookie和会话技术_Cookie_细节1_存活多少时间

Cookie的细节

　　一次可不可以发送多个？

　　可以

　　可以创建多个Cookie对象使用Response调用多次addCookie方法cookie即可

 

@WebServlet("/CookieDemo3")
public class CookieDemo3 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        Cookie cookie1 = new Cookie("msg","hello");
        Cookie cookie2 = new Cookie("name","zhangsan");
        response.addCookie(cookie1);
        response.addCookie(cookie2);
    }

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

 

　　

 

 

 

 

 

 

 

 

 

 

 

 

 

cookie在浏览器中保存多长时间。

　默认情况下，当浏览关闭后，Cook数据被销毁

　持久化存储

　　　setMaxAge(int seconds)

　　　正数：将Cookie数据写到硬盘的文件中。持久化存储。cookie存活时间

　　   负数：默认值

　　    零：删除cookie信息

@WebServlet("/CookieDemo4")
public class CookieDemo4 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        Cookie cookie1 = new Cookie("msg","setMaxAge");
//        cookie1.setMaxAge(30);
//        cookie1.setMaxAge(-1);
//        cookie1.setMaxAge(300);
        cookie1.setMaxAge(0);
        response.addCookie(cookie1);



    }

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

 

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