flex与jsp通信

<mx:HTTPService id="clientIpDs"
    url="http://192.168.10.135:8080/flcds/getIP.jsp"
    useProxy="false" showBusyCursor="true"
    resultFormat="text" method="POST"
    result="dealResult(event)"
    fault="alss(event)">
</mx:HTTPService>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String clientIP = request.getRemoteHost();
response.getWriter().print(clientIP); 
%>

<mx:Script>
		<![CDATA[
			import mx.rpc.events.FaultEvent;
			import mx.rpc.events.ResultEvent;
			import mx.events.CloseEvent;
			import mx.controls.Alert;
			import mx.events.ListEvent;
			import mx.collections.ArrayCollection;
			
			[Bindable]
			private var req_url:String = "http://192.168.10.135:8080/flcds/getIP.jsp";
			//询问是否与对方建立视频
			private function ask(evt:ListEvent):void{
				this.clientIpDs.send();
				var selectItem:Object = evt.currentTarget.selectedItem;
				Alert.show("确认请求与"+selectItem.username+"视频吗?","提示",Alert.OK|Alert.CANCEL,this,doRequest);
				//处理请求
				function doRequest(evt:CloseEvent):void{
					if(evt.detail == Alert.OK){
					}
				}
			}
			
			//处理获取的客户端IP
			private function dealResult(event:ResultEvent):void{
				Alert.show("请求成功......","提示");
				var cIp:String = event.result as String;
				Alert.show(cIp);
			}
			
			private function alss(event:FaultEvent):void{
				Alert.show("请求失败......","提示");
			}
			
		]]>
	</mx:Script>