我整合了flex4 struts2 spring3后，通过httpservice与action进行通信失败。请问什么原因？？
具体配置如下：
web.xml
<!-- *************************************** context param ************************************ -->
<!-- context param -->
    <context-param> 
        <param-name>contextConfigLocation</param-name> 
        <param-value>
        /WEB-INF/conf/applicationContext.xml
        /WEB-INF/conf/applicationContext-struts.xml
   <!--     /WEB-INF/conf/application-flex-config.xml   -->
        </param-value> 
    </context-param>
   
<!-- *************************************** context param ************************************ -->

<!-- ***************************************** listener begin *************************************** -->

<!-- Http Flex Session attribute and binding listener support -->
<listener>
<listener-class>flex.messaging.HttpFlexSession</listener-class>
</listener>

<!-- spring context listener -->
<listener> 
        <listener-class> 
            org.springframework.web.context.ContextLoaderListener  
        </listener-class> 
    </listener>

<!-- ***************************************** listener end *************************************** -->

<!-- ***************************************** filter begin *************************************** -->
    <!-- struts2 filter -->
    <filter> 
        <filter-name>struts2</filter-name> 
        <filter-class> 
           org.apache.struts2.dispatcher.FilterDispatcher  
        </filter-class> 
    </filter>
   
    <!-- struts2 filter mapping -->
     <filter-mapping> 
        <filter-name>struts2</filter-name> 
        <url-pattern>/*</url-pattern> 
    </filter-mapping>
   
    <filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>GBK</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>

<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
   
<!-- ***************************************** filter end *************************************** -->

<!-- ***************************************** servlet begin *************************************** -->
<!-- MessageBroker Servlet -->
    <servlet> 
        <servlet-name>MessageBrokerServlet</servlet-name> 
        <servlet-class> 
            org.springframework.web.servlet.DispatcherServlet  
        </servlet-class> 
    <init-param> 
            <param-name>contextConfigLocation</param-name> 
            <param-value> 
                /WEB-INF/conf/application-flex-config.xml  
            </param-value> 
        </init-param> 
        <load-on-startup>1</load-on-startup>   
    </servlet>

<!-- ***************************************** servlet end *************************************** -->

<!-- ***************************************** servlet mapping begin *************************************** -->
<servlet-mapping>
<servlet-name>MessageBrokerServlet</servlet-name>
<url-pattern>/messagebroker/*</url-pattern>
</servlet-mapping>

<!-- ***************************************** servlet mapping end *************************************** -->

------------------------------------------- spring -------------------------------------------------

1.application-flex-config.xml
<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:flex="http://www.springframework.org/schema/flex" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://www.springframework.org/schema/beans   
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/flex   
http://www.springframework.org/schema/flex/spring-flex-1.0.xsd">   
<bean id="messageBroker" 
        class="org.springframework.flex.core.MessageBrokerFactoryBean"> 
        <property name="servicesConfigPath"> 
            <value>/WEB-INF/flex/services-config.xml</value> 
        </property> 
    </bean> 
    <!-- Maps request paths at /* to the BlazeDS MessageBroker --> 
    <bean 
        class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> 
        <property name="mappings"> 
            <value>/*=messageBroker</value> 
        </property> 
    </bean> 
 
    <!-- Dispatches requests mapped to a MessageBroker --> 
    <bean class="org.springframework.flex.servlet.MessageBrokerHandlerAdapter" />  
 
</beans>
 
2. applicationContext-struts.xml
<beans>
   <bean id="loginAction" class="com.hotelManager.login.LoginAction" scope="prototype" />
</beans>

------------------------------------ struts.xml--------------------------------------------
struts.xml
<struts>
<!-- struts2 action配置文件 -->
<include file="struts-manager.xml" />

<!-- 当修改struts.xml时，重新加载 -->
<constant name="struts.configuration.xml.reload" value="true" />

<!-- 资源文件 -->
    <constant name="struts.custom.i18n.resources" value="messageResource" /> 
   
    <!-- 国际化字符集 -->
    <constant name="struts.i18n.encoding" value="UTF-8" />
   
    <!-- struts2默认视图主题 -->
    <constant name="struts.ui.theme" value="simple" /> 
   
    <!-- 上传文件大小上限 -->
    <constant name="struts.multipart.maxSize" value="1000000000" />
   
    <!-- action的后缀 -->
<constant name="struts.action.extension" value="htm,action" />

<!-- Spring负责创建Action实例 -->
    <constant name="struts.objectFactory" value="spring" />
     <!-- 全局的日志记录 与 错误跳传页面 -->
    <package name="hotelManager" extends="struts-default" abstract="true" namespace="/">      



<!--
  <global-results>
      <result name="NullPointerException"></result>
      <result name="exception"></result>
      <result name="error"></result>
      <result name="input"></result>
   </global-results>

   <global-exception-mappings>
      <exception-mapping result="exception" exception="java.lang.Exception"/>
      <exception-mapping result="NullPointerException" exception="java.lang.NullPointerException"/>
   </global-exception-mappings>   -->


    </package>
 
struts-manager.xml

<struts>
<package name="login" extends="hotelManager">
<action name="loginAction" class="com.hotelManager.login.LoginAction" method="login" />
</package>
</struts>

hotelManager.mxml
<fx:Script>
<![CDATA[
import mx.controls.Alert;
import mx.events.Request;
import mx.rpc.events.ResultEvent;
import mx.rpc.http.HTTPService;

protected function loginButton_clickHandler(event:MouseEvent):void
{
// TODO Auto-generated method stub
var service:HTTPService = new HTTPService();
service.resultFormat = "text";
service.method = "POST";
service.url = "loginAction.htm";
service.addEventListener(ResultEvent.RESULT, service_resultHandler);
var param:URLVariables = new URLVariables();
param.userCode = userCode.text;
param.password = password.text;
Alert.show("url:"+service.url);
service.send(param);
}

protected function service_resultHandler(event:ResultEvent):void{
var result:String = event.result.toString();
Alert.show("result:"+result);
if(result.match("success")){
Alert.show("登陆成功!!s");
}else{
Alert.show("登陆失败，用户名或密码错误！！");
return;
}
}

]]>
</fx:Script>

<mx:ViewStack x="0" y="0" id="indexStack" width="100%" height="100%">
<s:NavigatorContent label="welcome" width="100%" height="100%">
<s:Label id="userLabel" x="546" y="206" text="用户ID:" width="50" height="25" verticalAlign="middle" fontFamily="细明体" fontSize="15"/>
<s:Label id="passwordLabel" x="546" y="256" text="密码:"  width="50" height="25" fontFamily="细明体" fontSize="15" verticalAlign="middle"/>
<s:TextInput id="userCode" x="615" y="206"  width="206"/>
<s:TextInput id="password" x="615" y="256" displayAsPassword="true" width="206"/>
<s:Button id="loginButton" x="615" y="301" label="登陆" width="70" height="26" click="loginButton_clickHandler(event)"/>
</s:NavigatorContent>
</mx:ViewStack>