为了方便调用服务端接口，将httpservice进行封装。
//init service
/**
* 初始化服务
*/
RestServiceManager.instance.init("package.json",function():void{
},function():void{
});com.test.TestService 测试用例
var testService:TestService = RestServiceManager.instance.getServiceBean("TestService") as TestService;
//call service
testService.sayHello("ryot",new mx.rpc.Responder(function(event:ResultEvent):void{
trace(event.result):
},function(event:FaultEvent):void{
trace(event.message.toString()):
}));