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<mx:Button label="ÏÂ ÔØ" click="download()"/>
//ÏÂÔØ
  public function download():void{
   var str:String=this.uploadfiles.selectedIndex.toString();
   if(str=="-1"){
    Alert.show("ÇëÑ¡ÖÐÒªÏÂÔØµÄÎļþ");
   }else{
    downloadfiles();
   }
  }
  public function downloadfiles():void{
   var loadid:String=this.uploadfiles.selectedItem.loadid;
   if(loadid==null || loadid==""){
      Alert.show("¶Ô²»Æð£¬¸ÃÎļþ»¹Î´ÉÏ´«");
      }    
      var urlAddress:String=model.root+"/uploadFiles.do?method=download&loadid="+loadid;   
      //URLRequest¿ÉÒÔ²¶»ñµ¥¸öHTTPµÄËùÓÐÐÅÏ¢
      var url:URLRequest=new URLRequest(urlAddress);
         var loadname:String=this.uploadfiles.selectedItem.loadname;
         //download()·½·¨ÌáʾÓû§ÌṩÎļþµÄ±£´æÎ»Öò¢¿ªÊ¼´ÓÔ¶³Ì URL ½øÐÐÏÂÔØ¡£
         filedown.download(url,loadname);
  }
  protected override  function createChildren():void{
   super.createChildren();
   filedown.addEventListener(Event.COMPLETE,onDownCompleted);
  }
  public  function  onDownCompleted(evt:Event):void{
     this.resultlabel.visible=true;
        var fileref:FileReference = evt.currentTarget as FileReference;
        resultlabel.text = "ÎļþÃû:" + uploadfiles.selectedItem.loadname+ "ÏÂÔØÍê±Ï£¡";     
  }
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 /**
  * ÎļþÏÂÔØ
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  * @param mapping
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public class A
{
¡¡¡¡public var vo:B
}
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public static function registerClass():void
  {
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   PackUtil.registerClass(B);
  }
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¡¡¡¡var cloneA:A=clone(A);
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 private var model:ModelConfig=ModelConfig.getOne();
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À´Ô´£ºhttp://blogs.adobe.com/tomsugden/2009/12/writing_genuinely_reusable_fle.html
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