AS3根据编码类型解析文本

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package {

 import flash.text.TextField;

 import flash.utils.ByteArray;

 import flash.events.MouseEvent;

 import flash.events.Event;

 import flash.net.FileReference;

 import flash.display.MovieClip;

 
 public class Test extends MovieClip {

  private var ref : FileReference;

  private var btn_browse : MovieClip;

  private var textField : TextField;

 

  public function Test() {

   ref = new FileReference();

   ref.addEventListener(Event.SELECT, file_select);

   ref.addEventListener(Event.COMPLETE, file_complete);

  

   btn_browse = this["_btn_browse"] as MovieClip;

   btn_browse.buttonMode = true;

   btn_browse.addEventListener(MouseEvent.CLICK, btn_browse_click);

  

   textField = this["_text"] as TextField;

  }

 

  private function btn_browse_click(event : MouseEvent) : void {

   ref.browse();

  }

 

  private function file_select(event : Event) : void {

   ref.load();

  }

 

  private function file_complete(event : Event) : void {

   //解析字节数组

   var data : ByteArray = ref.data;

   var type : String = getFileType(data);

   var length : uint = data.length;

   var result : String = "";

   switch(type) {

    case "ANSI" :

     data.position = 0;

     result = data.readMultiByte(length-data.position, "gb2312");

     break;

    case "Unicode" :

    case "Unicode big endian" :

    case "UTF-8" :

     result=data.toString();

     break;

   }

   textField.text = type + "nn" + result;

   textField.scrollV=1;

  }

 

  //根据文件头信息判断文本文件编码类型;

  private function getFileType(fileData : ByteArray) : String {

   var b0 : int = fileData.readUnsignedByte();

   var b1 : int = fileData.readUnsignedByte();

   var fileType : String = "ANSI";

   if(b0 == 0xFF && b1 == 0xFE) {

    fileType = "Unicode";

   }else if(b0 == 0xFE && b1 == 0xFF) {

    fileType = "Unicode big endian";

   }else if(b0 == 0xEF && b1 == 0xBB) {

    fileType = "UTF-8";

   }

   return fileType;

  }

 }

}

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