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>

            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>