I have been learning about servlet programming from "Core Servlets".  I like this 
book.  But, since subscribing to this list, I have seen mention of "filters".  In a 
message from Yoav Shapira I was recommended to use "filters" to validate form data 
before passing it to a servlet.  This seems to me a cleaner means of doing it, as 
opposed to putting form-validation code in the servlet.  However, "Core Servlets" does 
not describe how to use filters (that I know of).  Is there a reference for this 
technique somewhere, or is it a generic term for "a servlet that intercepts, acts 
upon, and passes along data" ?  If it is the latter then I can figure it out from 
using getDispatcher().forward() etc but if it is a specific technique then where can I 
learn more?

My Tomcat container is v. 4.0.6.


Erik

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