Flex上传文件功能

Flex代码
<?xml version="1.0" encoding="utf-8"?> 
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="init()" layout="absolute" width="497" height="136" backgroundGradientAlphas="[1.0, 1.0]" backgroundGradientColors="[#F2F8F8, #45E7E5]"> 
    <mx:Script source="upload.as"></mx:Script> 
    <mx:Style> 
        .myfont{font-size:13pt} 
    </mx:Style> 
    <mx:Button x="10" y="95" label="上传文件" click="pickfile()" styleName="myfont"/> 
    <mx:Label x="10" y="10" text="文件上传" styleName="myfont"/> 
    <mx:ProgressBar x="10" y="40" width="457" themeColor="#F20D7A" minimum="0" mode="manual" maximum="100" id="progress1" label="当前进度: 0%" styleName="myfont" fontWeight="normal"/> 
    <mx:Label x="146" y="98" width="321" id="lbProgress" styleName="myfont" textAlign="right"/> 
</mx:Application> 


upload.as

Flex代码
// ActionScript file 
  import flash.events.Event; 
  import flash.net.FileFilter; 
  import flash.net.FileReference; 
  private var fileRef:FileReference = new FileReference(); 
  private function init():void{ 
       
  } 
  
private function pickfile():void{ 
     var imageTypes:FileFilter = new FileFilter("图片 (*.jpg, *.jpeg, *.gif,*.png)", "*.jpg; *.jpeg; *.gif; *.png"); 
     var textTypes:FileFilter = new FileFilter("文本文件(*.txt","*.txt;"); 
     var officeType:FileFilter = new FileFilter("Office文件(*.doc, *.xls","*.doc; *.xls"); 
     var anyType:FileFilter = new FileFilter("所有文件(*.*)","*.*"); 
    var allTypes:Array = new Array(imageTypes, textTypes,officeType,anyType); 
     fileRef.addEventListener(Event.SELECT, selectHandler); 
     fileRef.addEventListener(Event.COMPLETE, completeHandler); 
     fileRef.addEventListener(ProgressEvent.PROGRESS, progressHandler); 
    fileRef.addEventListener("ioError", ioerrorHandler); 
    try{ 
        var success:Boolean = fileRef.browse(allTypes); 
     }catch (error:Error){ 
         trace("Unable to browse for files."+error.toString()); 
     } 
} 
private function ioerrorHandler(event:Event):void{ 
     trace("Unable to upload file."+event.toString()); 
} 
private function progressHandler(event:ProgressEvent):void{ 
     lbProgress.text = " 已上传 " + (event.bytesLoaded/1024).toFixed(2)+ " K，共 " + (event.bytesTotal/1024).toFixed(2) + " K"; 
     var proc: uint = event.bytesLoaded / event.bytesTotal * 100; 
    progress1.setProgress(proc, 100); 
     progress1.label= "当前进度: " + " " + proc + "%"; 
  
} 
private    function selectHandler(event:Event):void{ 
    var request:URLRequest = new URLRequest("http://localhost:9080/upload/upload.jsp") 
     try 
     { 
        fileRef.upload(request); 
    } 
     catch (error:Error) 
   { 
         trace("Unable to upload file."+error.toString()); 
     } 
} 
private function completeHandler(event:Event):void{ 
     trace("uploaded"); 
}