struts.xml:(一般處於開發模式應,配置常量為開發模式更方便)

<constant name="struts.devMode" value="true"/>
<constant name="struts.custom.i18n.resources" value="en"/>	

web.xml

<?xml version="1.0" encoding="GBK">
<web-app ... version="3.0">
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
<init-param>
<param-name>struts.custom.i18n.resources</param-name>
<param-value>mess</param-value>
</init-param>
</filter>
....
</web-app>