页面刷新后删除了Java会话

I have a web site where I have a login form. If the login is successfull I put the object user into the session and I go in another page (in which I need the session attributes) in this way:

我有一个网站,我有一个登录表单。如果登录成功,我将对象用户放入会话中,然后以这种方式进入另一个页面(我需要会话属性):

-Java Servlet-

 request.getSession(true).setAttribute("utente", u);
 request.getSession(true).setAttribute("abbonamento", a);
 request.getRequestDispatcher("HomeUtente.jsp").forward(request, response);

-Jsp page-

    <%
    Utente u = null;
    Abbonamento a = null;
    try {
        u = (Utente) session.getAttribute("utente");
        a = (Abbonamento) session.getAttribute("abbonamento");
    } catch (Exception e) {
        a = null;
        u = null;
        e.printStackTrace();
    }
%>

Now, If I do this once it's ok, but If I refresh the page it seems that the session will be deleted.

现在,如果我这样做一旦没问题,但如果我刷新页面似乎会删除会话。

I guess this because when I refresh the page (in debug mode) a and u will be both null.

我想这是因为当我刷新页面时(在调试模式下)a和u都将为null。

Any idea?

1 个解决方案

#1

-1

Java Session -

Java会话 -

HttpSession getSession(boolean create) -

HttpSession getSession(boolean create) -

Returns the current HttpSession associated with this request or, if there is no current session and create is true, returns a new session.

返回与此请求关联的当前HttpSession,如果没有当前会话且create为true,则返回新会话。

So in your program as you are using -

所以在您使用的程序中 -

request.getSession(true) -

it is always returning a new session and previous session variables are deleted.

它始终返回一个新会话,并删除以前的会话变量。

also you can view the following link for better understanding -

您也可以查看以下链接以便更好地理解 -

How to check if session exists or not?

如何检查会话是否存在?

#1

-1