Flex中使用FileReference类下载文件_filereference download下载-优快云博客

本文介绍了一个使用Flash技术实现的文件下载组件。该组件通过定义FileReference对象并为其添加多种事件监听来实现文件下载功能，同时提供了下载进度和完成状态的通知。

<?xml version="1.0" encoding="utf-8"?>
<mx:HBox xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="init()">
<mx:Button label="下载EXCEL" click="{downloadSourceCodeZip(this._data)}"/>
<mx:Script>
  <![CDATA[
      import com.nsn.wy.business.model.Singleton;
      import mx.controls.Alert;
      import mx.collections.ArrayCollection;
      import flash.net.FileReference;
      [Bindable]
      private var _kqiValue:Number;
      [Bindable]
private var _dataValue:String;
[Bindable]
private var _data:Object;
private function clickHandler(evt:MouseEvent):void{
}
override public function set data(value:Object):void{
  _data = value;
}

      // 要下载文件的URL
      private const FILE_URL:String = Singleton.getInstance().downurl;
      private var fileRef:FileReference;
      private var urlReq:URLRequest;
      [Bindable]
      private var fineName:String;
      private function init():void {
        // 定义一个FileReference对象，并填加一系列事件监听
        fileRef = new FileReference();
        fileRef.addEventListener(Event.CANCEL, doEvent);
        fileRef.addEventListener(Event.COMPLETE, doEventOK);
        fileRef.addEventListener(Event.OPEN, doEvent);
        fileRef.addEventListener(Event.SELECT, doEvent);
        fileRef.addEventListener(HTTPStatusEvent.HTTP_STATUS, doEvent);
        fileRef.addEventListener(IOErrorEvent.IO_ERROR, doEvent);
        fileRef.addEventListener(ProgressEvent.PROGRESS, doEvent);
        fileRef.addEventListener(SecurityErrorEvent.SECURITY_ERROR, doEvent);
      }

      private function doEvent(evt:Event):void {
        // 取得当前FileReference的引用
        var fr:FileReference = evt.currentTarget as FileReference;
       // Alert.show("下载"+fineName+"文件失败");
      }
      private function doEventOK(evt:Event):void {
        // 取得当前FileReference的引用
        var fr:FileReference = evt.currentTarget as FileReference;
        Alert.show("下载"+fineName+"文件成功");
      }

      private function downloadSourceCodeZip(value:Object):void {
         // 以FILE_URL指定的地址建立一个URLRequest
        // Alert.show(FILE_URL+value.addres);
        fineName=value.addres;
        urlReq = new URLRequest(FILE_URL+value.addres);
        // 开始下载
        fileRef.download(urlReq);
      }

      private function showAlert(item:Object):void {
        Alert.show(item.eventString, item.type);
      }
    ]]>
</mx:Script>
</mx:HBox>