struts中跳转时json中的execudeProperties的问题

我想请问下那个userDAO是和哪关联，还是那个就没用

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts SYSTEM "http://struts.apache.org/dtds/struts-2.0.dtd" PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN">

-<struts>


-<package extends="json-default" name="struts2">


-<interceptors>

<interceptor name="loginInterceptor" class="com.ibeifeng.interceptor.LoginInterceptor"/>


-<interceptor-stack name="myStack">

<interceptor-ref name="loginInterceptor"/>

<interceptor-ref name="defaultStack"/>

</interceptor-stack>

</interceptors>


-<action name="login" class="loginAction">


-<result type="json">

<param name="excludeProperties">userDAO</param>

</result>

</action>


-<action name="commodityAdd" class="commodityAddAction">


-<result type="json">

<param name="excludeProperties">commodityDAO</param>

</result>

<interceptor-ref name="myStack"/>

</action>


-<action name="commodityQuery" class="commodityQueryAction">


-<result type="json">

<param name="excludeProperties">commodityDAO</param>

</result>

<interceptor-ref name="myStack"/>

</action>

</package>

</struts>

补充：Java ,  Web 开发