1:struts.xml的文档声名:
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
2:导入struts-core.jar
3.在配置中 导入这个<include file="struts-default.xml" />
4.联网后检查继承struts-default包