动态指定执行action的哪个方法

http://localhost:8080/s2_11_HCM_08/role/roleAction!addRole.go
http://localhost:8080/s2_11_HCM_08/role/roleAction!listRole.go

<?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>
 <package name="role" namespace="/role" extends="struts-default">
  <action name="roleAction" class="cn.itcast.action.RoleAction" method="{1}">
   <result name="addRole">/WEB-INF/page/role/addRole.jsp</result>
   <result name="listRole">/WEB-INF/page/role/listRole.jsp</result>
  </action>
 </package>  
</struts>