getting hold of the response

Hi, I am new to the Tomcat. Is there any way to get hold of the XHTML response Tomcat sends back to the client and modify it on the server ? I wish to change every response and to make the change permanent in Tomcat source. any help will be greatly appreciated.

how to write an output filter for tomcat

Hello, I wish to write an output filter for Tomcat and make the changes permanent in tomcat source. How can I get hold of the text output Tomcat sends back to the client? - Do you Yahoo!? Win 1 of 4,000 free domain names from Yahoo! Enter now.