actionscript3保存为jpg格式

package com.wdxc ...{
    import com.wdxc.util.JPGEncoder;
    import flash.net.URLRequest; 
    import flash.net.URLRequestMethod ;
      
    /** *//**
    * 与服务端通信
    * @author luqinglong
    */
    public class ImageService ...{
        
        private var url:String = "http://192.168.0.211:8080/photo/PhotoEditServlet?photoid=267005" ;
        
        public function ImageService() ...{
            
        }
              
        /** *//**  
         * 对图片编码并提交给服务端保存。
         * @param bitmapdata  
         * @param url       
         */         
        public function submit(bitmapdata:BitmapData,url:String):void ...{
            var request:URLRequest = new URLRequest(url);  
              
            //编码成图片格式流
            var encoder:JPGEncoder = new JPGEncoder(80); 
            var bytes:ByteArray = encoder.encode(bitmapdata);      
            
            request.method = URLRequestMethod.POST; 
            request.data = bytes ;   
                     
            //设置成文件流形式
            request.contentType = "application/octet-stream"; 

            var loader:URLLoader = new URLLoader();                  
            loader.load(request) ;            
                  
            loader.addEventListener(Event.COMPLETE, completeHandler) ;  
        }        
                             
        private function completeHandler(e:Event):void ...{
            e.currentTarget.removeEventListener(Event.COMPLETE, completeHandler);   
        }  
    }
    
}