Struts2 ActionMapping 地图ping 用法讲解？

Struts2 ActionMapping mapping 用法讲解？？
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {

请问ActionMapping mapping 怎么用？？？？？？？？？？？？？？
return null;
}

[解决办法]
....我要是没记错的话这个是Struts1的类

http://struts.apache.org/1.3.10/apidocs/org/apache/struts/action/ActionMapping.html#findForward(java.lang.String)