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Java Forum / General / August 2006servlet filters
Hello, I was just told about servlet filters. Is a new servlet filter instantiated per request? Also, when is the "doFilter" method called in relation to the filtered servlet's "service" method? Thanks for the info, - Dave > Hello, > > I was just told about servlet filters. Is a new servlet filter > instantiated per request? No. The lifecycle of a filter is similar to that of a servlet. One instance per VM, multithreaded. > Also, when is the "doFilter" method called > in relation to the filtered servlet's "service" method? The filter gets called first, then should chain to any other filters via the FilterChain's doFilter method. If it's the last filter in the chain, doFilter will pass control to the servlet's service method. Luke >> Also, when is the "doFilter" method called >> in relation to the filtered servlet's "service" method? Filters are usefull for processing requests before they are resolved. Filter does not create response, it routes request to the component(s) that will respond to it. That means that one can preprocess the request and forward it to a servlet for response. DG Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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