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How Do I Use the Servlet Filter To ......

 
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It is a security related question. I can use "role"-based security checking. For example, John can view the sales reports if he has the "sales role". Now, I want to further restrict John to view the sales reports in his "region" only.
People say that I can use the servlet filter. I do not know the validity of this statement. If it is valid, I need guidance to see some examples.
[ October 22, 2003: Message edited by: JiaPei Jen ]
 
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HTH
 
Consider Paul's rocket mass heater.
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