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Tomcat Architecture Diagram

zz from http://marakana.com/forums/tomcat/general/106.html


Valve and Filter:
"Valve" is Tomcat specific notion, and they get applied at a higher level than anything in a specific webapp. Also, they work only in Tomcat.

"Filter" is a Servlet Specification notion and should work in any compliant servlet container. They get applied at a lower level than all of Tomcat's
Valves.

However, consider also the division between your application and the application  server. Think whether the feature you're planning is part of your application, or is it rather a generic feature of the application server, which could have uses in other applications as well. This would be the correct criteria to decide between Valve and Filter.

Order for filter: The order in which they are defined matters. The container will execute the filters in the order in which they are defined.

posted on 2010-05-10 10:39 honzeland 阅读(1418) 评论(0)  编辑  收藏 所属分类: JavaWeb


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