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);
        }
    }
}