Flex(AS3)读写文本

<?xml version="1.0" encoding="utf-8"?>
<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml"
						layout="absolute" width="486" height="356"
						applicationComplete="onAppInit();" >
	
	<mx:Script><![CDATA[
		import mx.events.IndexChangedEvent;
		
		private var file:File;
		
		/**
		 * 程序初始化
		 */
		public function onAppInit():void
		{
			file = new File("f:/a.txt");
			var reader:FileStream = new FileStream();
			reader.open(file, FileMode.UPDATE);
			var len:int = reader.bytesAvailable;
			var str:String = reader.readUTFBytes(len);
			
			trace(str.replace(/\r\n/g, "|"));
		}
		
	]]>
	</mx:Script>
	
</mx:WindowedApplication>

以上代码是读取一个文本文件，然后把回车换行替换为“|”。