flex 学习笔记 filereference（三）

当FileReference的browse（）选择好图片后，如何得到已选择图片的路径?

利用DataEvent.UPLOAD_COMPLETE_DATA，当上载文件成功且从服务器接收数据之后派发此事件。

代码如下：

 
 

<?xml?version="1.0"?encoding="utf-8"?>?
  
  

<s:Application?xmlns:fx="http://ns.adobe.com/mxml/2009"? ?

  
  

????????????????xmlns:s="library://ns.adobe.com/flex/spark"? ?

  
  

????????????????xmlns:mx="library://ns.adobe.com/flex/mx">?

  
  

????<fx:Script>?

  
  

????????<![CDATA[ ?
  
  
????????????public?var?file:FileReference; ?
  
  
???????????? ?
  
  
????????????public?function?selectFile():void? ?
  
  
????????????{ ?
  
  
????????????????file?=?new?FileReference(); ?
  
  
????????????????file.addEventListener(Event.SELECT,?fileSelected); ?
  
  
????????????????file.addEventListener(DataEvent.UPLOAD_COMPLETE_DATA,?uploadDataComplete); ?
  
  
????????????????file.addEventListener(Event.COMPLETE,?uploadComplete); ?
  
  
????????????????file.addEventListener(IOErrorEvent.IO_ERROR,?handleError); ?
  
  
????????????????file.browse(); ?
  
  
????????????}???? ?
  
  
????????????public?function?handleError(event:IOErrorEvent):void? ?
  
  
????????????{ ?
  
  
????????????????status_txt.text?=?'ERROR:?'?+?event.text?+?''; ?
  
  
????????????} ?
  
  
????????????public?function?fileSelected(event:Event):void ?
  
  
????????????{ ?
  
  
????????????????file?=?FileReference(event.target); ?
  
  
????????????????file_txt.text?=?file.name; ?
  
  
????????????????status_txt.text?=?'upload?file:?'+?file.name?+?'';???????? ?
  
  
????????????????var?request:URLRequest?=?new?URLRequest(); ?
  
  
????????????????request.url?=?"http://cn-pc-hz2166:9080/UploadServlet"; ?
  
  
????????????????var?headerVariables:URLVariables?=?new?URLVariables(); ?
  
  
????????????????headerVariables.fileName?=?file.name; ?
  
  
????????????????request.data?=?headerVariables; ?
  
  
????????????????request.method?=?URLRequestMethod.POST; ?
  
  
????????????????file.upload(request,"Filedata");???????????? ?
  
  
????????????}???? ?
  
  
????????????public?function?uploadDataComplete(event:DataEvent):void? ?
  
  
????????????{ ?
  
  
????????????????var?result:XML?=?new?XML(event.data); ?
  
  
????????????????status_txt.text?+=?'Upload?Data?Complete' ?
  
  
????????????????status_txt.text?+=?'RESULT:?'?+?result.toString()?+?'' ?
  
  
????????????} ?
  
  
???????????? ?
  
  
????????????public?function?uploadComplete(event:Event):void? ?
  
  
????????????{ ?
  
  
????????????????status_txt.text?+=?'Upload?complete'; ?
  
  
???????????????? ?
  
  
????????????} ?
  
  
????????]]>?
  
  

????</fx:Script>?

  
  

????<mx:VBox>?

  
  

????????<mx:TextInput?id="file_txt"/>?

  
  

????????<mx:Button?id="select_btn"?label="select"?click="selectFile();"/>?

  
  

????????<mx:TextArea?id="status_txt"?width="400"?height="200"/>?

  
  

????</mx:VBox>?

  
  

</s:Application>