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What is Filter and why used in Servlet? tccicomputercoahching.com

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Filters are used to intercept and process requests before they are sent toservlets (in case of request). Filters are used to intercept and process a response before they are sent back to client by a servlet. The doFilter () is called every time the container determines that the filter should be applied to a page.

Filter and Servlet

Each filter implements the javax.servlet.Filter interface, which includes a doFilter() method that takes as input a request and response pair along with a filterchain , which is an instance of a class (provided by the servlet container) that implements the javax.servlet.FilterChain interface.

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