会议不工作 - GAE / J [英] Session is NOT working - GAE/J
问题描述
我有loginservlet,我将String变量设置为session。
HttpSession hs = req.getSession(true);
if(hs.isNew()){
hs.setAttribute(logininfo,mylogininfo);
}
然后我尝试在JSP页面中检索这些信息 -
<%
HttpSession hs = request.getSession(false);
String logininfo =(String)hs.getAttribute(logininfo);
%>
我总是将logininfo字符串设置为空 - 不知道为什么。
我在appengine-web.xml中启用了会话
< ;>启用会话-;真< /会话启用>
以上只是一个我试图运行的试用示例,我真的想将'accessToken'传递给来自servlet的JSP页面用于Facebook登录。
我不知道你的页面被调用的顺序是什么,但最可能的罪魁祸首是使用 isNew()
方法。
会话是在服务器向用户浏览器发送cookie时建立的。这发生在任何页面的第一次请求,授权或未授权。
因此, isNew()
仅在首先请求您的任何页面,而用户尚未收到任何cookie。在任何连续的请求(甚至几天之后,取决于GAE admin中的 Cookie过期:
设置),它将为假。
I am fairly new to GAE/J development and trying to use GAE Seesion. Somehow when i try to retrieve value stored in session, its coming back null only. Here is what i have.
I have loginservlet where i am setting String variable to session.
HttpSession hs=req.getSession(true);
if(hs.isNew()){
hs.setAttribute("logininfo", "mylogininfo");
}
then I try to retrieve this information inside JSP page as below -
<%
HttpSession hs = request.getSession(false);
String logininfo = (String) hs.getAttribute("logininfo");
%>
I am always getting "logininfo" string as null - not sure why.
I have session enabled inside appengine-web.xml
<sessions-enabled>true</sessions-enabled>
Above is just a trial example I am trying to run, i really want to pass 'accessToken' to JSP page from servlet for facebook login.
I don't know in what order your pages are called, but the most probable culprit is the use of isNew()
method.
Sessions are established when server sends a cookie to users browser. This happens on first request of any page, authorized or non-authorized.
So, isNew()
is true only on the first request to any of your pages, while user has not yet received any cookie. On any consecutive request (even days later, depends on Cookie Expiration:
setting in GAE admin) it will be false.
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