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>