web.xml분석좀 해주세요

제가 남이 짠 소스를 분석해서 개발해야 하는데요 jsp도 거의 모르고 해서 부탁좀 드릴께요

web.xml을 보시고 자세히좀 comment주세요. 제가 책에 보니까 처음으로 불리는 servelt이 명시되어야 하는데

이상한 org.apache.struts.action.ActionServlet을 참조하는 것 같은데 이거는 어디에 있는 servelt인가요?

좀 자세히 부탁드릴께요

<?xml version="1.0" encoding="UTF-8"?>
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" >

Encoding Filter
kr.ac.icu.spiral.sspmt.common.EncodingFilter

encoding
EUC-KR

Encoding Filter
/*

To use non XDoclet filter-mappings, create a filter-mappings.xml file that
contains the additional filter-mappings and place it in your
project's merge dir.
-->

To use non XDoclet listeners, create a listeners.xml file that
contains the additional listeners and place it in your
project's merge dir.
-->

action
org.apache.struts.action.ActionServlet

application
Resources


chainConfig
/WEB-INF/conf/chain-config.xml


config
/WEB-INF/conf/struts-config.xml


debug
0

1

action
*.do

struts-tiles /WEB-INF/tld/struts-tiles.tld struts-html /WEB-INF/tld/struts-html.tld struts-bean /WEB-INF/tld/struts-bean.tld struts-logic /WEB-INF/tld/struts-logic.tld struts-nested /WEB-INF/tld/struts-nested.tld