Struts2 用ModelDriven接收参数

1、struts.xml

<struts>
 <constant name="struts.devMode" value="false" /> 
 <constant name="struts.enable.DynamicMethodInvocation" value="true" />
 <constant name="struts.i18n.encoding" value="utf-8"></constant>
 <package name="user"  extends="struts-default">                 
        <action name="user" class="com.wxh.action.UserAction" >
            <result >/useraddsuccess.jsp</result>
        </action>         
  </package>     
</struts><struts>
 <constant name="struts.d