Flex中单文件的上传实现方式

例显示在运行时加载的文件的数据格式和状态信息。

注意：要运行此示例，请更改 uploadURL.url 属性以指向实际的 URL，而不是示例中虚拟的地址。URL 应指向名为yourUploadHandlerScript.cfm 的文件，该文件位于指定 URL 的根 Web 目录下。根据您的配置，您可能还需要编译 SWF 文件，将“本地回放安全性”设置为“只访问网络”，或更新 Flash Player 的安全设置，以允许此文件网络访问。

package {    import flash.display.Sprite;    import flash.events.*;    import flash.net.FileFilter;    import flash.net.FileReference;    import flash.net.URLRequest;    public class FileReferenceExample extends Sprite {        private var uploadURL:URLRequest;        private var file:FileReference;        public function FileReferenceExample() {            uploadURL = new URLRequest();            uploadURL.url = "http://www.[yourDomain].com/yourUploadHandlerScript.cfm";            file = new FileReference();            configureListeners(file);            file.browse(getTypes());        }        private function configureListeners(dispatcher:IEventDispatcher):void {            dispatcher.addEventListener(Event.CANCEL, cancelHandler);            dispatcher.addEventListener(Event.COMPLETE, completeHandler);            dispatcher.addEventListener(HTTPStatusEvent.HTTP_STATUS, httpStatusHandler);            dispatcher.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler);            dispatcher.addEventListener(Event.OPEN, openHandler);            dispatcher.addEventListener(ProgressEvent.PROGRESS, progressHandler);            dispatcher.addEventListener(SecurityErrorEvent.SECURITY_ERROR, securityErrorHandler);            dispatcher.addEventListener(Event.SELECT, selectHandler);            dispatcher.addEventListener(DataEvent.UPLOAD_COMPLETE_DATA,uploadCompleteDataHandler);        }        private function getTypes():Array {            var allTypes:Array = new Array(getImageTypeFilter(), getTextTypeFilter());            return allTypes;        }        private function getImageTypeFilter():FileFilter {            return new FileFilter("Images (*.jpg, *.jpeg, *.gif, *.png)", "*.jpg;*.jpeg;*.gif;*.png");        }        private function getTextTypeFilter():FileFilter {            return new FileFilter("Text Files (*.txt, *.rtf)", "*.txt;*.rtf");        }        private function cancelHandler(event:Event):void {            trace("cancelHandler: " + event);        }        private function completeHandler(event:Event):void {            trace("completeHandler: " + event);        }        private function uploadCompleteDataHandler(event:DataEvent):void {            trace("uploadCompleteData: " + event);        }        private function httpStatusHandler(event:HTTPStatusEvent):void {            trace("httpStatusHandler: " + event);        }                private function ioErrorHandler(event:IOErrorEvent):void {            trace("ioErrorHandler: " + event);        }        private function openHandler(event:Event):void {            trace("openHandler: " + event);        }        private function progressHandler(event:ProgressEvent):void {            var file:FileReference = FileReference(event.target);            trace("progressHandler name=" + file.name + " bytesLoaded=" + event.bytesLoaded + " bytesTotal=" + event.bytesTotal);        }        private function securityErrorHandler(event:SecurityErrorEvent):void {            trace("securityErrorHandler: " + event);        }        private function selectHandler(event:Event):void {            var file:FileReference = FileReference(event.target);            trace("selectHandler: name=" + file.name + " URL=" + uploadURL.url);            file.upload(uploadURL);        }    }}