as3.0利用FlashProxy类来实现js跨域访问数据的方法源代码

1.  /**
   2. * @author Kinglong
   3. * @version 0.5
   4. */ 
   5.  
   6. package com.klstudio.upload { 
   7.     
   8.     import flash.display.*; 
   9.     import flash.events.*; 
  10.     import flash.net.*; 
  11.     import flash.external.ExternalInterface; 
  12.     import flash.system.Security;    
  13.  
  14.     public class FlashProxy extends Sprite{  
  15.          
  16.         private var _params:Object; 
  17.         private var _loader:URLLoader; 
  18.         private var _method:String; 
  19.         private var _id:String; 
  20.         private var _parse:Boolean; 
  21.         private var _inited:Boolean; 
  22.         private var _data:String; 
  23.         private var _xml:XML; 
  24.          
  25.         public function FlashProxy(){ 
  26.             Security.allowDomain('*'); 
  27.             _inited = false; 
  28.             _data = ""; 
  29.             _parse = true; 
  30.             _method = URLRequestMethod.POST; 
  31.             _loader = new URLLoader(); 
  32.             configureListeners(_loader); 
  33.         } 
  34.          
  35.         public function load(page:String,params:Object=null):void{ 
  36.             if(!_inited){ 
  37.                 showError("FlashProxy还没有初始化!"); 
  38.             } 
  39.             if(page == null || page == undefined){ 
  40.                 showError("page参数为必须的!"); 
  41.                 return; 
  42.             } 
  43.             var vars:URLVariables = new URLVariables(); 
  44.             vars.tmp = Math.random(); 
  45.             if(params != null){              
  46.                 for(var key in params){ 
  47.                     if(key == "tmp"){ 
  48.                         continue; 
  49.                     } 
  50.                     vars[key] = params[key]; 
  51.                 } 
  52.             }           
  53.             _loader.dataFormat = URLLoaderDataFormat.TEXT; 
  54.             var request:URLRequest = new URLRequest(page); 
  55.             request.method = _method; 
  56.             request.data = vars; 
  57.             _loader.load(request); 
  58.         } 
  59.          
  60.         public function setParse(value:Boolean):void{ 
  61.             _parse = value; 
  62.         } 
  63.          
  64.         public function setMethod(value:String):void{ 
  65.             if(value == null || value == undefined){ 
  66.                 return; 
  67.             } 
  68.             value = StringUtil.trim(value); 
  69.             if(value.toLocaleUpperCase() == URLRequestMethod.POST || value.toLocaleUpperCase() == URLRequestMethod.GET){ 
  70.                 _method = value.toLocaleUpperCase(); 
  71.             }           
  72.         } 
  73.          
  74.         public function getData():String{ 
  75.             return _data; 
  76.         } 
  77.          
  78.         private function configureListeners(dispatcher:IEventDispatcher):void { 
  79.             dispatcher.addEventListener(Event.COMPLETE, completeHandler); 
  80.             dispatcher.addEventListener(Event.OPEN, openHandler); 
  81.             dispatcher.addEventListener(ProgressEvent.PROGRESS, progressHandler); 
  82.             dispatcher.addEventListener(SecurityErrorEvent.SECURITY_ERROR, securityErrorHandler); 
  83.             dispatcher.addEventListener(HTTPStatusEvent.HTTP_STATUS, httpStatusHandler); 
  84.             dispatcher.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler); 
  85.         } 
  86.          
  87.         private function completeHandler(event:Event):void { 
  88.             _data = _loader.data; 
  89.             if(_parse){ 
  90.                 try{ 
  91.                     _xml = new XML(_data);                   
  92.                 }catch(error:Error){ 
  93.                     _parse = false; 
  94.                     _xml = null; 
  95.                     Tracer.debug("xml解析错误!"); 
  96.                 } 
  97.             } 
  98.             ExternalInterface.call(_id+".onComplete"); 
  99.         } 
100.  
101.         private function openHandler(event:Event):void { 
102.             ExternalInterface.call(_id+".onOpen"); 
103.         } 
104.  
105.         private function progressHandler(event:ProgressEvent):void {             
106.             ExternalInterface.call(_id+".onProgress",event.bytesLoaded,event.bytesTotal); 
107.         } 
108.  
109.         private function securityErrorHandler(event:SecurityErrorEvent):void { 
110.             showError("读取失败!\n  不能跨域访问,可能是你在web服务端根目录下没有放置crossdomain.xml文件!"); 
111.         } 
112.  
113.         private function httpStatusHandler(event:HTTPStatusEvent):void { 
114.             showError("读取失败!\n  HTTP错误代码为:"+event.status); 
115.         } 
116.  
117.         private function ioErrorHandler(event:IOErrorEvent):void { 
118.             showError("读取失败!\n  可能是因为下列原因:\n    1.网络忙,请稍候重试!\n    2.访问的web服务端没有开启!"); 
119.         } 
120.          
121.         public function alert(msg:String):void{ 
122.             navigateToURL(new URLRequest(msg)); 
123.         } 
124.          
125.         public function showError(msg:String):void{          
126.             ExternalInterface.call(_id+".onError",msg); 
127.         } 
128.     } 
129.     
130. }