chuanjiang lo asked:
> 
> Is it the correct way to implement session management using 
> filters? I'm rather new to structs and i would like to know 
> is there any good sites or tutorials i can refer on writing filters?

> what does the url-pattern do?
> 
> and in the codes
> filterChain.doFilter(request, response);
> what does this actually do?

It sounds like you've not done any basic homework on filters.  You might
want to start with
http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/Servlets8.html#103101

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