flex HTTPService应用

flex和spring security搭建的时候遇到一个问题，在发送http请求的时候需要给服务器发送sessionid要不然你只能请求到security没有拦截的login页面

				var httpService:HTTPService=new HTTPService;
				httpService.url=Constants.SERVER + this._url;
				httpService.method=this._method;
				httpService.useProxy=false;
				httpService.requestTimeout = 10;
				httpService.headers["JSESSIONID"]=Constants.SESSIONID;
				if(!isLogin)
				{
					if("GET" == httpService.method)
					httpService.contentType="application/x-www-form-urlencoded";
					else
					httpService.contentType="application/json";
				}
				else
				{
					httpService.contentType="application/x-www-form-urlencoded";
				}
				httpService.addEventListener("result", resultHandler);
				httpService.addEventListener("fault",faultHandler);
				httpService.send(params);

// 上面是发送sessionid
// 获取sessionid，请求登录成功后，http请求的根据http协议会返回一个sessionid这里就可以获得到
private function resultHandler(event:ResultEvent):void
{
	var jsessionId:String = event.currentTarget.headers["JSESSIONID"];
}