Flex读文本文件

布局：

 <s:Group id="maskGroup" width="" height="" x="" y="">
         <s:Rect width="100%" height="100%">
             <s:fill>
                 <s:SolidColor color="#000000"/>
             </s:fill>
         </s:Rect>
     </s:Group>

 <mx:Canvas x="" y="" width="" height="" backgroundColor="#5976A4"
                horizontalScrollPolicy="off" verticalScrollPolicy="off">
         <s:Scroller id="scrollerId" width="100%" height="100%"
                     horizontalScrollPolicy="off" interactionMode="touch"
                     skinClass="skin.libraryIntroduce.ScrollerSkin">
             <s:Group x="" y="" width="" height="">
                 <s:Label id="introTxt" x="" y="" width="" color="#FFFFFF" fontFamily="微软雅黑"
                          fontSize="" textAlign="left" verticalAlign="top"
                          mask="{maskGroup}"/>
             </s:Group>
         </s:Scroller>
     </mx:Canvas>

AS:

var file:File=new File("文本文件的绝对路径");
if(file2.exists)
                    {
                        var fileStream:FileStream=new FileStream();
                        fileStream.open(file,FileMode.READ);
    //算高度仅供参考
introTxt.height=(Math.floor(Number(fileStream.bytesAvailable/))+)*;
                        introTxt.text=fileStream.readMultiByte(fileStream.bytesAvailable,"gbk");
                        trace(introTxt.height);
                        scrollerId.verticalScrollBar.value=;
                    }