简单的----Flex从服务器上下载文件，不用后台代码支持
<?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" xmlns:supportClasses="com.esri.ags.skins.supportClasses.*" minWidth="955" minHeight="600" xmlns:modules="com.sddl.modules.*"><s:layout><supportClasses:AttachmentLayout/></s:layout><fx:Declarations><!-- 将非可视元素（例如服务、值对象）放在此处 --></fx:Declarations><modules:downLoadButton/></s:Application>
<?xml version="1.0" encoding="utf-8"?><mx:Canvas xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" creationComplete="init(event)" xmlns:mx="library://ns.adobe.com/flex/mx" width="100%" height="100%"><fx:Declarations><!-- 将非可视元素（例如服务、值对象）放在此处 --></fx:Declarations><fx:Script><![CDATA[import mx.controls.Alert;import mx.events.FlexEvent;private var userIdentity:String = "0";//用户身份private var downloadURL:URLRequest;private var fileName:String;[Bindable]private var downLoadName:String;private var urlLocal:String;private var file:FileReference;protected function init(event:FlexEvent):void{urlLocal= mx.core.Application.application.url;if(userIdentity=="0"){fileName = "gybcldr.xlsx";//供应部材料导入downLoadName = "供应部材料导入模版.xlsx";}if(userIdentity=="1"){fileName = "scjybcldr.xlsx";//生产经营部材料导入downLoadName = "生产经营部材料导入模版.xlsx";}if(userIdentity=="3"){fileName = "sgbucldr.xlsx";//施工部门材料导入downLoadName = "施工部门材料导入模版.xlsx";}}protected function button1_clickHandler(event:MouseEvent):void{downloadURL = new URLRequest();downloadURL.url = urlLocal.substr(0,urlLocal.lastIndexOf("/"))+"downLoading/"+fileName;file = new FileReference();configureListeners(file);file.download(downloadURL, downLoadName);}private function configureListeners(dispatcher:IEventDispatcher):void {dispatcher.addEventListener(Event.COMPLETE, completeHandler);}private function completeHandler(event:Event):void {Alert.show("下载成功","提示!");}]]></fx:Script><mx:Button label="模版下载" click="button1_clickHandler(event)" cornerRadius="0" height="25" width="120"/></mx:Canvas>[align=left][/align]