This tutorial provides a good source for cut-and-paste development of your own Filters. The filter implementations are not meant to do anything useful, but you can use them as a basis for development.

Files in this tutorial

WEB-INF/classes/example/filters/ExampleResponseHeadersFilter.java	A filter class that sets response headers
WEB-INF/classes/example/filters/ExampleRequestFilter.java	A filter class that wraps the request
WEB-INF/classes/example/filters/ExampleResponseFilter.java	A filter class that wraps the response
WEB-INF/web.xml	Configuring the use of a filter in web.xml
index.jsp	A jsp that show's the result of using example.filters.ExampleResponseHeadersFilter

TODO: An example of intercepting the output stream in a response wrapper

Try the Tutorial

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