Flex 与 servlet 通信 【xml】

String userId = request.getParameter("userId");
System.out.println(userId);
response.setCharacterEncoding("UTF-8");
//response.getWriter().println("hello world -- 我爱你。。。");
String xml = "<user>" +
"<username>涛哥</username>" +
"</user>";
response.getWriter().println(xml);
import flash.trace.Trace;
private var loader:URLLoader = new URLLoader();
private function asCallHandler():void{
// URL
var url:String = "http://localhost/app01/getUser";
// 参数
var args:URLVariables = new URLVariables();
args.userId = 1;
// Request请求
var request:URLRequest = new URLRequest(url);
request.data = args;// 绑定参数
//请求加载器

loader.addEventListener(Event.COMPLETE,handleServerResponse);
loader.load(request);//发送请求
}
private function handleServerResponse(e:Event):void{
trace("User data is loaded");
//将返回的数据解析成xml
var resultXML : XML = new XML(loader.data);
var uname : String = resultXML.username[0];
debugText.text = uname;
}
protected function button1_clickHandler(event:MouseEvent):void
{
// 发送请求
asCallHandler();
}