flex 下载文件

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" verticalAlign="middle" backgroundColor="white" creationComplete="init();"> <mx:Script> <!--[CDATA[ import mx.controls.Alert; import mx.collections.ArrayCollection; import flash.net.FileReference; [Bindable] [Embed('assets/disk.png')] private var diskIcon:Class; [Bindable] private var arrColl:ArrayCollection; // 要下载文件的URL private const FILE_URL:String = "http://www.nshen.net/blog/doc/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_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; // 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); } ]]--> </mx:Script> <mx:Model id="fileRefModel"> <file> <creationDate>{""}</creationDate> <creator>{""}</creator> <modificationDate>{""}</modificationDate> <name>{""}</name> <size>{""}</size> <type>{""}</type> </file> </mx:Model> <mx:Button id="downloadBtn" label="Download example source code" icon="{diskIcon}" click="downloadSourceCodeZip()" toolTip="{FILE_URL}" height="40" /> <mx:DataGrid id="debug" dataProvider="{arrColl}" width="{downloadBtn.width}" rowCount="5" rowHeight="22" itemClick="showAlert(event.currentTarget.selectedItem)"> <mx:columns> <mx:DataGridColumn dataField="data" headerText="#" width="20" /> <mx:DataGridColumn dataField="type" headerText="Type" showDataTips="true" dataTipField="eventString" /> </mx:columns> </mx:DataGrid> <mx:Text id="txt" condenseWhite="true" visible="false"> <mx:text> creationDate: {fileRefModel.creationDate} creator: {fileRefModel.creator} modificationDate: {fileRefModel.modificationDate} name: {fileRefModel.name} size: {fileRefModel.size} type: {fileRefModel.type} </mx:text> </mx:Text> </mx:Application>