跨服务器上传图片

1，背景：程序在A服务器上，图片在B图片服务器上

2，客户端上传文件到A服务器上，A服务器，在通过流的方式，将图片发送给B服务器上

服务器A代码

   public class UploadImage : IHttpHandler    {        public void ProcessRequest(HttpContext context)        {            context.Response.ContentType = "text/html";            if (context.Request.Files.Count > 0)            {                //文件流                var httpfile = context.Request.Files[0];                var stream = httpfile.InputStream;                var length = stream.Length;                if (length == 0)                {                    throw new Exception("zero file");                }                //文件类型                var imageFormat = ImageFormat.Jpeg;                switch (ext)                {                    case ".jpg":                        imageFormat = ImageFormat.Jpeg;                        break;                    case ".gif":                        imageFormat = ImageFormat.Gif;                        break;                    case ".png":                        imageFormat = ImageFormat.Png;                        break;                    default:                        break;                }                //复制至内存中                var count = (int)stream.Length;                var ms = new MemoryStream();                var bytes = new byte[count];                stream.Read(bytes, 0, count);                ms.Write(bytes, 0, count);                ms.Position = 0;                CookieCollection mycookies = null;                //上传至图片服务器                var res = PostWebData("http//:www.xxxx.com", ref mycookies, "utf-8", Convert.ToBase64String(ms.ToArray()));                //判断是否上传成功.....               // 将返回的路劲保存起来            }        }        /// <summary>        /// 向网站Post数据        /// </summary>        /// <param name="uri"></param>        /// <param name="mycookies"></param>        /// <param name="encoding"></param>        /// <param name="data"></param>        /// <returns></returns>        public string PostWebData(string uri, ref CookieCollection mycookies, string encoding, string data)        {            var encode = getEncoding(encoding);            var datas = encode.GetBytes(data);            var length = datas.Length;            try            {                //请求                var req = HttpWebRequest.Create(uri) as HttpWebRequest;                var cookies = new CookieContainer();                req.KeepAlive = true;                req.AllowAutoRedirect = true;                req.AllowWriteStreamBuffering = true;                req.Credentials = CredentialCache.DefaultCredentials;                req.ContentType = "application/x-www-form-urlencoded";                req.Accept = "*/*";                req.Referer = "http://www.lanxe.net/";                req.Timeout = 20000;                req.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; .NET CLR 1.1.4322; .NET CLR 2.0.50215; fqSpider)";                req.Method = "POST";                req.ContentLength = length;                req.CookieContainer = cookies;                //加入额外的Cookie                if (mycookies != null)                {                    foreach (Cookie item in mycookies)                    {                        cookies.Add(item);                    }                }                //发送内容                var stream = req.GetRequestStream();                stream.Write(datas, 0, length);                stream.Close();                //获取返回的数据                var res = (HttpWebResponse)req.GetResponse();                mycookies = cookies.GetCookies(req.RequestUri);                return getHtml(res, encode);            }            catch            {                return null;            }        }        /// <summary>        /// 根据名称获取网页编码格式        /// </summary>        /// <param name="name"></param>        /// <returns></returns>        static Encoding getEncoding(string name)        {            if (string.IsNullOrEmpty(name))            {                return Encoding.UTF8;            }            else if (name.ToLower() == "default")            {                return Encoding.Default;            }            else            {                return Encoding.GetEncoding(name);            }        }        /// <summary>        /// 从Response中获取HTML内容        /// </summary>        /// <param name="res"></param>        /// <param name="encode"></param>        /// <returns></returns>        static string getHtml(HttpWebResponse res, Encoding encode)        {            var outs = new StringBuilder();            var stream = res.GetResponseStream();            var reader = new StreamReader(stream, encode);            // 每次读取1024            var buffer = new char[1024];            var count = reader.Read(buffer, 0, 1024);            while (count > 0)            {                outs.Append(new String(buffer, 0, count));                count = reader.Read(buffer, 0, 1024);            }            // 读取完毕            reader.Close();            stream.Close();            return outs.ToString();        }        #region IHttpHandler 成员        public bool IsReusable        {            get { throw new NotImplementedException(); }        }        #endregion        #region IHttpHandler 成员        bool IHttpHandler.IsReusable        {            get { throw new NotImplementedException(); }        }        void IHttpHandler.ProcessRequest(HttpContext context)        {            throw new NotImplementedException();        }        #endregion    }}服务器端B代码  public partial class _Default : System.Web.UI.Page    {        protected void Page_Load(object sender, EventArgs e)        {            var stream = Request.InputStream;            Encoding myEncoding = Encoding.GetEncoding("utf-8");            byte[] content = new byte[stream.Length];            //将数据流读入到数组            stream.Read(content, 0, content.Length);            //将数组转换为string ，并且反base64解码            string str = myEncoding.GetString(content);            byte[] buffer = Convert.FromBase64String(str);            PutImage(buffer);        }        public bool PutImage(byte[] ImgIn)        {            System.IO.MemoryStream ms = new System.IO.MemoryStream(ImgIn);            System.Drawing.Image image = System.Drawing.Image.FromStream(ms);            image.Save("C:\\Data\\imgs\\4\\yourPic.Png",                   System.Drawing.Imaging.ImageFormat.Png);            return true;        }    }