Flex 檔案下載

private var fr:FileReference = null; //注意，要寫在外面，否則會被記憶體回收掉，下載時會找不到來源，按存檔時會無作用。
private function downloadClipboard(event:MouseEvent):void
{
var clip:Cls_Clipboard = this.selectedClipboard;
if (clip != null) {
fr = new FileReference()
fr.addEventListener(Event.COMPLETE, function():void {
fr = null; //載入完成時，才設成 null 等待記憶體回收。
trace('fr set null');
});
fr.download(new URLRequest(clip.ClipboardPath_Fix), getDownloadFilename(clip.ClipboardPath_Fix, "clipboard-"));
} else {
DiijaUtils.popMsg('請選擇一張剪影才能下載');
}
}

/**
* 回傳如下格式 clipboard-20081017150538.png
*/
private function getDownloadFilename(url:String, prefix:String="clipboard-"):String
{
var formater:DateFormatter = new DateFormatter();
formater.formatString = "YYYYMMDDHHNNSS"; //日期格式請參考 http://livedocs.adobe.com/flex/3/langref/mx/formatters/DateFormatter.html

var split:Array = url.split('.');
return prefix + formater.format(new Date()) + '.' + split[split.length - 1];
}