WebService端代码

        /// <summary>  
        /// 上传文件到远程服务器  
        /// </summary>  
        /// <param name="fileBytes">文件流</param>  
        /// <param name="fileName">文件名</param>  
        /// <returns>字符串</returns>   
        [WebMethod(Description = "上传文件到远程服务器.")]
        public string UploadFile(byte[] fileBytes, string fileName)
        {
            try
            {
                MemoryStream memoryStream = new MemoryStream(fileBytes); //1.定义并实例化一个内存流，以存放提交上来的字节数组。  
                FileStream fileUpload = new FileStream(Server.MapPath(".") + "\\" + fileName, FileMode.Create); ///2.定义实际文件对象，保存上载的文件。  
                memoryStream.WriteTo(fileUpload); ///3.把内存流里的数据写入物理文件  
                memoryStream.Close();
                fileUpload.Close();
                fileUpload = null;
                memoryStream = null;
                return "文件已经上传成功";
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
        } 

Flex客户端代码

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
			   xmlns:s="library://ns.adobe.com/flex/spark" 
			   xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" creationComplete="application1_creationCompleteHandler(event)">
	<fx:Script>
		<![CDATA[
			import mx.controls.Alert;
			import mx.events.FlexEvent;
			import mx.graphics.codec.JPEGEncoder;
			import mx.rpc.events.FaultEvent;
			import mx.rpc.events.ResultEvent;

			protected function application1_creationCompleteHandler(event:FlexEvent):void
			{
				var width :int = imgID.width;      
				var height :int = imgID.height;      
				var bitmapData:BitmapData =http://www.mamicode.com/new BitmapData(width,height);      >