Flex FileReference 在Firefox 浏览器情况下的异常情况

Question: Flex 3.5 或 Flex 4 + pureMVC + BlazeDs + Java 1.6.0_18 + Spring + Hibernate 环境下开发的App,在做上传导入文件时，遇到了浏览器兼容问题。

在IE下，导入完全没问题；但在Firefox 下导入失败。跟踪Service 发现用Firefox 做导入请求时，该请求对象中未携带session信息导致的。查阅了API，没找到有效的解决办法。用IE和Firefox 做导入时，Service端取得的信息如下：

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Solution: 在UI端做上传请求的URL中人为地添加sessionid信息。

var sessionId: String = ApplicationFacade.getInstance().currentUser.sessionId;
?????_url = _url.replace("?",";jsessionid=" + sessionId + "?");

Importer.as 类如下：

public class Importer ?{?????? ??public static function upload(displayObj:DisplayObject,url:String):void ??{ ???var _url:String = url;?? ???var parentObj:DisplayObject = displayObj; ???var? file:FileReference =new FileReference(); ???openFile(); ???var pb:PopupProgressBar = PopUpManager.createPopUp(parentObj,PopupProgressBar,true) as PopupProgressBar; ?????? ? ????? ???file.addEventListener(ProgressEvent.PROGRESS,onProgress); ???file.addEventListener(Event.SELECT,onSelect); ???file.addEventListener(Event.CANCEL,onCancel); ???file.addEventListener(DataEvent.UPLOAD_COMPLETE_DATA,uploadComplateHandler); ??? ???file.addEventListener(IOErrorEvent.IO_ERROR,errorHandler); ??? ???function uploadComplateHandler(event : DataEvent) : void ???{ ????PopUpManager.removePopUp(pb); ???} ??? ???function errorHandler(evt:IOErrorEvent):void ???{ ???? PopUpManager.removePopUp(pb);? ???} ??? ???function onCancel(evt:Event):void ???{ ???? PopUpManager.removePopUp(pb);? ???} ??? ???function onProgress(e:ProgressEvent):void ???{ ????pb.importProgess(true); ???????????? PopUpManager.centerPopUp(pb) ???} ??? ???function openFile():void ???{ ????file.browse([new FileFilter("File Type(*.csv)","*.csv;")]); ???} ? ???function onSelect(e:Event):void ???{??? ????proceedWithUpload(); ???} ? ???function proceedWithUpload():void ???{ ????try ????{ ?????var sessionId: String = ApplicationFacade.getInstance().currentUser.sessionId; ?????_url = _url.replace("?",";jsessionid=" + sessionId + "?"); ?????var request:URLRequest = new URLRequest(_url); ???????????????? request.method = URLRequestMethod.POST; ???????????????? file.upload(request,"file"); ????} ????catch (error:Error) ????{ ?????PopUpManager.removePopUp(pb); ?????Alert.show("upload failed"); ????} ???} ??? ??} ?}