JSP中cookie.getMaxAge()怎么总是得到-1呢?

Java code
//设置Cookie
Cookie cookie = new Cookie("username","guest");
cookie.setMaxAge(60*60*24);//设置过期时间
response.addCookie(cookie);

为什么我在Jsp中取出Cookie的时候,getMaxAge()的值为-1;
Jsp代码:

Java code
<% Cookie[] cookies = request.getCookies();
        if(cookies != null) {
            for(Cookie c:cookies){
        %>
            cookieName:<%=c.getName()%><br>
            cookieValue:<%=c.getValue()%><br>
            cookieMaxAge:<%=c.getMaxAge()%><br>
       <%
            }
       }
%>

Jsp显示结果:
cookieName:username
cookieValue:guest
cookieMaxAge:-1

怎样才能得到Cookie过期时间! --------------------编程问答-------------------- 把cookie的路径设置一下。设成你应用名的根目录试试 --------------------编程问答-------------------- -1应该为不过期 --------------------编程问答-------------------- cookie的时间是毫秒吧你有没有很长时间没有处理呢，还有就是你response.addCookie(cookie);
后马上取出来看一下咯 --------------------编程问答-------------------- -1表示Cookie会在浏览器关闭时过期 --------------------编程问答-------------------- 你可以自己设过期时间呀 --------------------编程问答-------------------- 学习了 --------------------编程问答-------------------- mark --------------------编程问答--------------------

当时取出来就是-1
Cookie cookie = new Cookie("username","guest");
cookie.setMaxAge(60*60*24);//设置过期时间
response.addCookie(cookie);
Cookie[] cookies = request.getCookies();
        if(cookies != null) {
            for(Cookie c:cookies){

             System.out.println(c.getName());
             System.out.println(c.getMaxAge());
             };
            }else
            {

            }

--------------------编程问答-------------------- I don't know if this is off topic for this list but I will ask anyway.  I
> written two java servlets which I am running on tomcat 4.0.  One servlet
> creates cookies, the other displays details about them.  One thing I have
> done is to use the setMaxAge method on a cookie object.  But when I
> interrogate the cookie using getMaxAge in the other servlet the value is
> always -1 reagardless of what I originaly set it to.  Having a value of -1
> means that the cookie gets to deleted as soon as the browser window is
> closed.  This could be a problem with my browser settings (IE 5) or
> something with tomcat.  I am pretty sure I am setting the value correctly in
> the java code.
>

The answer to this is in the cookie specification (don't recall which RFC
it is at the moment).

When you set up a cookie and send it, you can populate all of the
properties.  However, when the browser returns the cookie with a
subsequent request, it *only* sends the value.  Thus, there is no way toi
determine what the browser thinks the maximum age is; you will have to
remember what you told it in the first place.
哎，老外也没有说出个所以然来！好像说之传递了cookie的value值。
--------------------编程问答-------------------- --------------------编程问答-------------------- 那这算不算是不是一个BUG呢？ --------------------编程问答-------------------- 这样设置肯定是生效了，但是这个函数getMaxAge()好像确实不能获取到正确值。呵呵，我感觉是bug（个人见解） --------------------编程问答-------------------- -1 indicating the cookie will persist until browser shutdown. --------------------编程问答--------------------

引用 8 楼 jinchun1234 的回复:

当时取出来就是-1
Cookie cookie = new Cookie("username","guest");
cookie.setMaxAge(60*60*24);//设置过期时间
response.addCookie(cookie);
Cookie[] cookies = request.getCookies();
        if(cookies != null) {
            for(Cookie c:cookies){

            System.out.println(c.getName());
            System.out.println(c.getMaxAge());
            };
            }els…

这个Cookie根本还没有送到客户端，所以request.getCookies来是旧的，所以MaxAge还是旧的。 --------------------编程问答-------------------- Cookie没有送到客户端，MaxAge还是旧的。 --------------------编程问答-------------------- cookie 的流程

new Cookie()->response ->client ->request -> getCookies 如果你设置的PATH正确的话，就能正确取到了 --------------------编程问答-------------------- 楼主，这个问题，你解决了么？他们的答案我表示没看懂啊？我遇到和你一样的问题了
--------------------编程问答-------------------- 工具——internet选项——退出浏览器时删除浏览记录前边的勾去掉 --------------------编程问答-------------------- cookie好像是以毫秒为单位的。

补充：Java ,  Web 开发