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>