Flex识别文本文件编码

?private function butClickHandle(e:MouseEvent):void ???? { ????? var file:File = File.desktopDirectory;? ???? //打开文件 ?????? if (e.target.id=="but_openfile"){ ?????? var txtfilter:FileFilter = new FileFilter("Text","*.as;*.css;*.txt;*.java;*.html;*.htm;*.xml"); ?????? file.browseForOpen("Open",[txtfilter]); ?????? file.addEventListener(Event.SELECT,function(e:Event):void{ ??????? var file:File = new File(e.target.nativePath); ??????? var filestream:FileStream = new FileStream; ??????? filestream.open(file,FileMode.READ); ??????? var bytes:ByteArray = new ByteArray; ??????? filestream.readBytes(bytes,file.size); ??????? txtfile.text = transEncodingText(bytes); ?????? }); ????? } ???? //打开文件夹 ????? if (e.target.id=="but_opendir"){ ?????? file.browseForDirectory("打开文件夹"); ?????? file.addEventListener(Event.SELECT,function(e:Event):void{ ??????? txtfile.text = e.target.nativePath + File.lineEnding; ??????? var contents:Array = File(e.target).getDirectoryListing(); ??????? for (var i:int=0;i<contents.length;i++){ ???????? txtfile.text += contents[i].name +"t"+ contents[i].size + File.lineEnding; ??????? } ?????? });? ????? } ???? } ? ?//var bytes:ByteArray = new ByteArray; ?//filestream.readBytes(bytes,file.size); ?// 读取不同 编码的文档 ???? private function transEncodingText(bytes:ByteArray):String ???? { ????? // 1. unicode 文档 开头 16进制码为 FF FE,对应 十进制 数 为 255，254 ????? if (bytes[0]==255 && bytes[1]==254){ ?????? return bytes.readMultiByte(bytes.length,"unicode"); ????? } ????? // 2.unicode big endian 开头 16进制 为 FE FF，对应十进制数 为 254，255 ????? if (bytes[0]==254 && bytes[1]==255){ ?????? return bytes.readMultiByte(bytes.length,"UTF-16BE"); ????? } ???? // 3.utf-8 开头 16进制 为 EF BB ，对应 十进制 数 为 239，187 ????? if (bytes[0]==239 && bytes[1]==187){ ?????? return bytes.readMultiByte(bytes.length,"utf-8"); ????? } ????? // 默认采用系统编码 读取 ????? return bytes.readMultiByte(bytes.length,File.systemCharset); ???? }