如果jsf应用程序中发生会话超时，如何重定向到索引页 [英] How to redirect to index page if session time out happened in jsf application
问题描述
我正在使用JSF RI 1.1.如果会话超时，如何重定向到索引页面?
I am using JSF RI 1.1. How to redirect to index page if session time out happens?
推荐答案
有两种可以组合的方式:
There are two ways which can be combinied:
Make use of the
<meta>refresh header in the HTML<head>element in combination withHttpSession#getMaxInactiveInterval()which returns the remnant of seconds the session has yet to live.
<meta http-equiv="refresh" content="${pageContext.session.maxInactiveInterval};url=index.jsf">
这种方法将在会话期满后自动将页面重定向到给定的url.
This approach will automatically redirect the page to the given url when the session expires.
捕获 ViewExpiredException 在web.xml中:
<error-page>
<exception-type>javax.faces.application.ViewExpiredException</exception-type>
<location>/index.jsf</location>
</error-page>
当会话到期时触发了POST请求(h:commandButton，h:commandLink等)时，此方法将自动将请求转发到给定的<location>.
This approach will automatically forward the request to the given <location> when a POST request has been fired (h:commandButton, h:commandLink, etc) while the session is expired.
请注意，我个人希望使用中间的会话已过期"警告页面或警报以避免"wtf?".体验，从而改善用户体验.更甚者，当客户通过监听click和keypress来显示活动时，我宁愿每分钟触发一次ajaxical民意测验，以使会话的生存期可以更长.
Note that I personally would prefer an intermediate "Session Expired" warning page or alert to avoid "wtf?" experiences and thus improve the user experience. Even more, I would as well prefer firing an ajaxical poll every minute when the client has shown activity by listening on click and keypress, so that the session's lifetime can be postponed more.
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