try

            {

                WebRequest myrequest = WebRequest.Create(HttpContext.Current.Request["path"]);//前台js传的path，可以是远程服务器上的，也可以是本地的

                WebResponse myresponse = myrequest.GetResponse();

                Stream imgstream = myresponse.GetResponseStream();

                System.Drawing.Image img = System.Drawing.Image.FromStream(imgstream);

                MemoryStream ms = new MemoryStream();

                img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

                context.Response.AddHeader("Content-Length", ms.Length.ToString());

                context.Response.Clear();

                context.Response.ContentType = "image/jpeg";

                context.Response.BinaryWrite(ms.ToArray());

                context.Response.OutputStream.Flush();

                context.Response.OutputStream.Close();

            }

            catch (Exception ex)

            {

                log.Error("读取图片异常：", ex);

                throw ex;

            }