文件上传下载小例

//文件上传
package
{
    import flash.net.FileReference;
    import flash.events.Event;
    import flash.net.URLRequest;

    public class UploadExample
    {
        public function UploadExample()
        {
            var fileRef:FileReference = new FileReference();
            fileRef.addEventLister(Event.SELECT, selectHandler);
            fileRef.addEventLister(Event.COMPLETE, completeHandler);
            try
            {
                var success:Boolean = fileRef.browse();
            }
            catch (error:Rrror)
            {
                trace("不能浏览文件.");
            }
        }

        function selectHandler(event:Event):void
        {
            var request:URLRequest = new URLRequest("");
            try
            {
                fileRef.upload(request);
            }
            catch (error:Error)
            {
                trace("不能上传文件.");
            }
        }

        function completeHandler(event:Event):void
        {
            trace("上传文件完成.");
        }
    }
}
//文件下载
package
{
    import flash.display.Sprite;
    import flash.net.FileReference;
    import flash.net.URLRequest;
    import flash.net.URLRequestMethod;
    import flash.net.URLVariables;

    public class DownloadFileExample extends Sprite
    {
        private var fileToDownload:FileReference;

        public function DownloadFileExample()
        {
            var request:URLRequest = new URLRequest();
            request.url = "";
            request.method = URLRequestMethod.GET();
            request.data = new URLVariables("id=2");
            fileToDownload = new FileReference();
            try
            {
                fileToDownload.download(request, "file.txt");
            }
            catch (error:Error)
            {
                trace("不能下载数据!");
            }
        }
    }
}