Filter to detect a user not logged in 2004-01-27 - By Merrill Cornish
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I'm trying to learn filters by writing one to detect when someone who
has not logged in tries to access a JSP page that requires login. From
what I've read, this seems to be one common use of filters.
I think I understand how to write the filter, but to determine whether
the session had been logged in, I need to HttpSession object.
The doFilter() method receives ServletRequest rather than
HttpServletRequest, so there is no getSession() method. At the same
time, since the filter is tied to ServletRequest and ServletResponse, it
appears that the filter runs at a level "above" individual sessions,
implying that a filter could never check whether a specific session was
logged in.
Can filters be used to check whether a user is logged in?
Merrill
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