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-<?xml version="1.0" encoding="utf-8"?>
-<!--Arbortext, Inc., 1988-2005, v.4002-->
-<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN"
- "concept.dtd">
-<concept id="cwfiltbn" xml:lang="en-us">
-<title>Listeners</title>
-<prolog><metadata>
-<keywords><indexterm>filters<indexterm>overview</indexterm></indexterm>
-</keywords>
-</metadata></prolog>
-<conbody>
-<p>Filters are new in the <cite>Sun Microsystems Java Servlet
-2.3 Specification</cite>. They enable you to intercept to intercept a
-request before it reaches a resource. In other words, a filter gives you
-access to the HttpServletRequest and the HttpServletResponse objects
-before they are passed on to a servlet.</p>
-<p>Filters can be very useful. For example, you can write a filter
-that records all incoming requests and logs the IP addresses of the
-computers from which the requests originate. You also can use a filter
-as an encryption and decryption device. Other uses include user
-authentication, data compression, user input validation, and so on.</p>
-<p>You also can put a set of filters in a chain. The first filter in
-the chain will be called first and then pass control to the second
-filter, and so on. Filter chaining ensures that you can write a filter
-that does a specific task but adds some functionality in another filter.</p>
-<p>When writing a filter, you basically deal with the
-following three interfaces in the javax.servlet package:
-<ul>
-	<li><b>javax.servlet.Filter:</b> represents the
-	life-cycle of the filter.</li>
-	<li><b>javax.servlet.FilterConfig:</b> represents the
-	configuration of the filter.</li>
-	<li><b>javax.servlet.FilterChain:</b> object provided by
-	the servlet container to the developer giving a view into the
-	invocation chain of a filtered request for a resource.</li>
-</ul></p>
-<p>For more information about filters, refer to the <cite>Sun Microsystems <tm
-tmclass="special" tmowner="Sun Microsystems, Inc." tmtype="tm" trademark="Java">Java</tm> Servlet
-2.3 Specification</cite> at <codeph>java.sun.com/products/servlet/download.html</codeph>.</p>
-</conbody>
-</concept>