struts配置请求后缀，将.action改为.do、.doaction_2015.01.04

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
    <!-- 将.action访问，改为.do、.doaction:同时处理这两种后缀 -->
    <constant name="struts.action.extension" value="do,doaction"></constant>
    
    <package name="hw" namespace="/test" extends="struts-default">
        <action name="helloworld" class="com.self.action.HelloWorldAction" method="dohelloworld" >
            <result name="doresult">
                /showresult.jsp
            </result>
        </action>
    </package>
</struts>

原访问地址：http://localhost:8080/Struts2_01/test/helloworld.action(改后访问404)
该后地址01：http://localhost:8080/Struts2_01/test/helloworld.do
该后地址02：http://localhost:8080/Struts2_01/test/helloworld.doaction