检测网络的两个类urlmonitor和socketmonitor

air中的urlmonitor和socketmonitor可用于检测网络状况：前者用于监控与Http服务器的链接，后者用于检测socket服务链接。两者的构造函数有明显的差别，前者是一个标准的url参数，后者是典型的socket参数：ip和端口。下面是一个典型的监控网络链接例子：

<?xml version="1.0" encoding="utf-8"?><mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml"layout="absolute"creationComplete="init()"><mx:Script><!--[CDATA[import air.net.SocketMonitor;import air.net.URLMonitor;private var urlMonitor:URLMonitor;private var urlRequest:URLRequest;////////////////////////////////////private var socketMonitor:SocketMonitor;private function init():void{urlRequest=new URLRequest("http://localhost:8080/");urlMonitor=new URLMonitor(urlRequest);urlMonitor.addEventListener(StatusEvent.STATUS, statusHandler);urlMonitor.start();////////////////////////////////////////socketMonitor=new SocketMonitor("http://localhost:8080/", 8080);socketMonitor.addEventListener(StatusEvent.STATUS, socketMonitorHandler);socketMonitor.start();}private function socketMonitorHandler(e:StatusEvent):void{trace("socketMonitor:"+e.code);}private function statusHandler(e:StatusEvent):void{trace("urlMonitor:"+e.code);}]]--></mx:Script></mx:WindowedApplication>