flex 与jsp 通信有关问题

flex 与jsp 通信问题
为什么我装的flex没有办法与jsp通信啊，在网上找了好几个flex和jsp通信的例子，如最简单的登入都没有办法实现，难道与还需要配置flex，我用的例子是
mxml代码：
<?xml version="1.0" encoding="utf-8"?>  
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">  
  <mx:Script>  
  <![CDATA[  
  import flash.net.navigateToURL;  
  import mx.controls.Alert;  
  import mx.rpc.events.ResultEvent;  
  private function loginHandle():void {  
  doLogin.send();  
  }  
  private function loginResult(evt:ResultEvent):void {  
  if(evt.result.loginResult=="yes")  
  {  
  Alert.show("登入成功");
  } else {  
  Alert.show("用户名或密码错误！");  
  }  
  }  
  private function loginSuccess():void {  
  var successful:String = "./SUC.jsp";  
  var request:URLRequest = new URLRequest(successful);  
  navigateToURL(request,"_self");  
  }  
  ]]>  
  </mx:Script>  
   
  <mx:HTTPService id="doLogin" result="loginResult(event)"  
  showBusyCursor="true" method="POST" url="./index.jsp" >  
  <mx:request>  
  <username>  
  {nametxt.text}  
  </username>  
  <password>  
  {passwordtxt.text}  
  </password>  
  </mx:request>  
  </mx:HTTPService>  
   
  <mx:Panel x="10" y="53" width="412" height="256" layout="absolute">  
  <mx:Label x="31" y="49" text="用户名" width="72"/>  
  <mx:Label x="31" y="96" text="密 码" width="43"/>  
  <mx:TextInput x="82" y="47" id="nametxt"/>  
  <mx:TextInput x="82" y="94" id="passwordtxt" displayAsPassword="true"/>  
  <mx:Button x="58" y="167" label="ok" click="loginHandle()" />  
  <mx:Button x="151" y="167" label="cancel"/>  
  </mx:Panel>  
   
</mx:Application> 

jsp代码：
<%  
  String uname = request.getParameter("username");  
  String password = request.getParameter("password");  
   
  System.out.println(uname);  
  System.out.println(password);  
   
  out.println("<loginResult>yes</loginResult>");  
%>

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