在JSP中设置会话并在Servlet中获取会话

Question

I am setting a session attribute in JSP code as below and submitting the HTTP form to servlet:

session.setAttribute("qnaInfo", qnaInfo);
System.out.println("session.getAttribute" + session.getAttribute("qnaInfo"));

I am trying to get session attribute in a servlet code as below:

HttpSession session = request.getSession(true);
AuthQnAInfo storedQnaInfo = (AuthQnAInfo) session.getAttribute("qnaInfo");

In servlet it is null only on IE. But in Chrome I get the value.
Please help to resolve this.

Answer 1

在所有浏览器中，session.getAttribute（“ aaaa”）正常工作，尝试

Answer 2

From How can I enable session tracking for JSP pages if the browser has disabled cookies? :

If the browser does not support cookies, or if cookies are disabled, you can still enable session tracking using URL rewriting. URL rewriting essentially includes the session ID within the link itself as a name/value pair. However, for this to be effective, you need to append the session ID for each and every link that is part of your servlet response. Adding the session ID to a link is greatly simplified by means of of a couple of methods: response.encodeURL() associates a session ID with a given URL, and if you are using redirection, response.encodeRedirectURL() can be used by giving the redirected URL as input.

Both encodeURL() and encodeRedirectedURL() first determine whether cookies are supported by the browser; if so, the input URL is returned unchanged since the session ID will be persisted as a cookie.