flex 下载文件

　　   flex/FileReference_ download_test/FileReference_download_test.zip"; private var fileRef:FileReference; private var urlReq:URLRequest; private function init():void { // 初始化一个空ArrayCollection arrColl = new ArrayCollection(); // 以FILE_URL指定的地址建立一个URLRequest urlReq = new URLRequest(FILE_URL); // 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, doEvent); fileRef.addEventListener(Event.OPEN, doEvent); fileRef.addEventListener(Event.SELECT, doEvent); fileRef.addEventListener(HTTPStatusEvent.HTTP_STAT US, doEvent); fileRef.addEventListener(IOErrorEvent.IO_ERROR, doEvent); fileRef.addEventListener(ProgressEvent.PROGRESS, doEvent); fileRef.addEventListener(SecurityErrorEvent.SECURI TY_ERROR, doEvent); } private function doEvent(evt:Event):void { // 取得当前FileReference的引用 var fr:FileReference = evt.currentTarget as FileReference; // 填加事件顺序和类型到DataGrid组件 arrColl.addItem({data:arrColl.length+1, type:evt.type, eventString:evt.toString()}); try { // 更新 Model. fileRefModel.creationDate = fr.creationDate; fileRefModel.creator = fr.creator; fileRefModel.modificationDate = fr.modificationDate; fileRefModel.name = fr.name; fileRefModel.size = fr.size; fileRefModel.type = fr.type; // 显示文本 txt.visible = true; } catch (err:*) { // uh oh, an error of sorts. } } private function downloadSourceCodeZip():void { // 清空现有的 array collection. arrColl = new ArrayCollection(); // 隐藏文本组件 txt.visible = false; // 开始下载 fileRef.download(urlReq); } private function showAlert(item:Object):void { Alert.show(item.eventString, item.type); } ]]-->    {""} {""} {""} {""} {""} {""}    width="{downloadBtn.width}" rowCount="5" rowHeight="22" itemClick="showAlert(event.currentTarget.selectedI tem)">  width="20" />      creationDate: {fileRefModel.creationDate} creator: {fileRefModel.creator} modificationDate: {fileRefModel.modificationDate} name: {fileRefModel.name} size: {fileRefModel.size} type: {fileRefModel.type}