JSP - Filters : Complete Tutorial

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Servlet and JSP Filters are Java classes that can be used in Servlet and JSP Programming for the following purposes:

• To intercept requests from a client before they access a resource at back end.
• To manipulate responses from server before they are sent back to the client.

There are are various types of filters suggested by the specifications:

• Authentication Filters.
• Data compression Filters
• Encryption Filters .
• Filters that trigger resource access events.
• Image Conversion Filters .
• Logging and Auditing Filters.
• MIME-TYPE Chain Filters.
• Tokenizing Filters .
• XSL/T Filters That Transform XML Content.  more...