Flash读写cookie

flash cookie 主要利用了ShareObject类实现。flash cookie的好处是用户不易删除并且可以写入大量数据，但缺点是如果用户屏蔽掉了flash那就over了。 
主类主要给外部js提供了方法。 
用途：可以将swf设置成1x1像素，隐藏掉。利用js写入。 
cookie类

代码如下：

package com.tools { 
  import  flash.net.SharedObject; 
  // 
  public class Cookie { 
    private var _$so:SharedObject; 
    /// 
    function Cookie() { 
      init(); 
    } 
    private function init():void { 
    } 
    //--------------------------------------------// 
    public function setCookie(key:String, val:String, name:String = "sina_cookie"):void { 
      //trace("setCookie"); 
      _$so = SharedObject.getLocal(name); 
      //_$so.data["old"] = "26"; 
      _$so.data[key] = val; 
    } 
    public function getCookie(key:String, name:String = "sina_cookie"):String { 
      _$so = SharedObject.getLocal(name); 
      //trace("key:" + key + "--data:" + _$so.data.key) 
      if(_$so.size > 0 && _$so.data[key]) { 
        return _$so.data[key]; 
      } else { 
        return null; 
      } 
    } 
    public function clearKey(key:String, name:String = "sina_cookie"):void { 
      _$so = SharedObject.getLocal(name); 
      _$so.data[key]= null; 
    } 
    public function clearCookie():void { 
      _$so.clear(); 
    } 
    public function flush():void { 
      _$so.flush(); 
    } 
  }//end class 
}

实现类（主类）

package com.sina.testCookie { 
  import flash.display.Sprite; 
  import flash.external.ExternalInterface; 
  import com.tools.Cookie; 
  // 
  public class MainCookie extends Sprite{ 
    private var _$co:Cookie; 
    // 
    function MainCookie() { 
      init(); 
    } 
    private function init():void { 
      _$co = new Cookie(); 
      //------test--------- 
      setCookie("name", "antz"); 
      //flush(); 
      //clearCookie(); 
      //clearKey("name") 
      //trace(getCookie("old")) 
      addCallBack(); 
    } 
    private function addCallBack():void { 
      ExternalInterface.addCallback("setCookie", setCookie); 
      ExternalInterface.addCallback("getCookie", getCookie); 
      ExternalInterface.addCallback("flush", flush); 
      ExternalInterface.addCallback("clearCookie", clearCookie); 
      ExternalInterface.addCallback("clearKey", clearKey); 
    } 
    private function setCookie(key:String, value:String) { 
      _$co.setCookie(key, value); 
      //return getCookie(key) 
    } 
    private function getCookie(key:String):String { 
      var val = _$co.getCookie(key); 
      return val; 
    } 
    private function flush():void { 
      _$co.flush(); 
    } 
    private function clearCookie():void { 
      _$co.clearCookie(); 
    } 
    private function clearKey(key:String):void { 
      _$co.clearKey(key) 
    } 
  }//end class; 
本文转自dotfun 51CTO博客，原文链接:http://blog.51cto.com/dotfun/286026