flex remoteObject java 交互

以前一直用 HttpServices 连接. 后来发来有的项目用的是remoteObject 连接,有点看不懂,所
以用它先测试一下.不过呢.服务器部分不知道怎么写了？

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="absolute">


<mx:Script>
<![CDATA[
import mx.rpc.events.ResultEvent;

private function say():void {
var user:User = new User() ;
user.setId(1) ;
user.setName("hello") ;
sayRemote.SayHello(user) ;
}

private function SayRem(event:ResultEvent):void {
target.text = event.result as String ;
}

]]>
</mx:Script>
<mx:RemoteObject  id="sayRemote">
<mx:method name="SayHello" result="SayRem(event)" />
</mx:RemoteObject>

<mx:TextInput id="n"  change="say()"/>
<mx:Label text="target" id="target" />
</mx:Application>

---

package
{
[RemoteClass(alias="User")]
public class User
{

public var name:String ;
public var id:int ;

public function User()
{
}