开发模式配置
在struts.xml中配置常量：
<constant name="struts.devMode" value="true" />
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<?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></struts>
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