参考书籍：flash actionscript 3 殿堂之路 孙颖 p311 -320
数据格式：文本、值对、二进制
要建立一个成功能通信请求，通信请求对象必须知道足够的信息--------请求对象、方式、数据等，
主要包括：1、请求的有效ＵＲＬ地址 2、请求方式（get or post）
读取文本数据例子（带注释核心代码部分）与读取对值对格式的例子（不带注释）
public class SampleXML extends Sprite {// private var title_txt:TextField ;public function SampleXML():void{//var targetURL:String = "http://feeds.feedburner.com/Kingda";// var targetURL:String = "test2.xml" ;var targetURL:String = "test1.txt" ;var reques:URLRequest = new URLRequest(targetURL);var variables:URLLoader;try{variables = new URLLoader();}catch(err:Error){trace("err");};variables.dataFormat = URLLoaderDataFormat.VARIABLES ;variables.addEventListener(Event.COMPLETE ,completeHandle);variables.addEventListener(ProgressEvent.PROGRESS ,test);try{trace("loading ......");variables.load(reques);}catch(error:Error){trace("uable to load url");}/*title_txt = new TextField();title_txt.autoSize = "left" ;addChild(title_txt);*/ }public function completeHandle(evn:Event):void{/* trace(evn.target.data is String);var res:XML = new XML(evn.target.data);var titlelist:XMLList = res.channel.item.title;for each(var title:XML in titlelist){title_txt.appendText("*" + title+"'\n");trace (title.toString());}
*/trace(evn.target.data);var loader:URLLoader = evn.target as URLLoader ;var i:String;for( i in loader.data){trace(i+"\t:"+ loader.data[i] );}}public function test(evn:ProgressEvent):void{trace(evn.bytesTotal + "\t" +evn.bytesLoaded);// trace(evn.);// loader.if(evn.bytesLoaded >= 1024*1024){trace("over");}}}读取二进制格式数据的例子
public class SampleBinary extends Sprite {private var loader:Loader ;private var loader2:Loader;public function SampleBinary():void{// var targetURL:String = "test2.xml" ;var targetURL:String = "D:/OSMF/OSMFPlayer/bin/OSMFPlayer.swf" ;var reques:URLRequest = new URLRequest(targetURL);var variables:URLLoader;variables = new URLLoader();variables.dataFormat = URLLoaderDataFormat.BINARY ;variables.addEventListener(Event.COMPLETE ,completeHandle);variables.addEventListener(ProgressEvent.PROGRESS ,test);try{trace("loading ......");variables.load(reques);}catch(error:Error){trace("uable to load url"+error);}}public function completeHandle(evn:Event):void{trace("loaded");loader = new Loader();var content:ByteArray = evn.target.data as ByteArray ;loader.contentLoaderInfo.addEventListener(Event.COMPLETE ,convertHandle);loader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS,test2); loader.loadBytes(content);// trace(content);loader2 = new Loader();loader2.contentLoaderInfo.addEventListener(Event.COMPLETE,convertHandle);loader2.loadBytes(content);}public function convertHandle(evn:Event):void{this.addChild(evn.target.loader as Loader);evn.target.loader.y = 50; evn.target.loader.x =200*Math.random() ; // this.addChild(evn.target.loader2 as Loader);// evn.target.loader2.y =100 ;// evn.target.loader2.x = 50;}public function test(evn:ProgressEvent):void{// trace(evn.bytesTotal + "\t" +evn.bytesLoaded);// trace(evn.);// loader./*if(evn.bytesLoaded >= 1024*1024){trace("over");}*/// var loader:URLLoader = evn.target as URLLoader ;//trace(loader.data);} public function test2(evn:ProgressEvent):void{trace(evn.bytesTotal + "\t" +evn.bytesLoaded);}}