Redirect from login.jsp if already logged in

Question

Hello

If registered user jumps to login.jsp I wish to redirect him to youAreLoggedIn.jsp. Can this be made with <navigation-rule>? I know how to do this in PHP but not in JSP. When user visits login.jsp it must check if user is logged in this I know how to check. But how to trigger this action? Should I make a new servlet or what?

Thanks!

Answer 1

A common practice is to use a Filter for this. Just implement javax.servlet.Filter, define it in web.xml, map it on an url-pattern of /login.jsp and write something like following in doFilter() method:

if (((HttpServletRequest) request).getSession().getAttribute("user") != null) {
    // User is logged in, redirect to desired page.
    ((HttpServletResponse) response).sendRedirect("youAreLoggedIn.jsp");
} else {
    // Do nothing, continue request.
    chain.doFilter(request, response);
}

Simple as that. It of course assumes that the logged-in User is been put in the session scope as per the normal practices.

That said, <navigation-rule> is JSF specific, but you didn't state anything about JSF in your question nor the tags. Aren't you confusing things up?