/// 
        /// 文件上传        /// 
        ///         ///         /// 
             public string FileSaveAliyunOSS(HttpPostedFileBase file, string fileName)        {            string FilePath = "";            //上传到阿里云              using (Stream fileStream = file.InputStream)//转成Stream流              {                string md5 = OssUtils.ComputeContentMd5(fileStream, file.ContentLength);                //string today = DateTime.Now.ToString("yyyyMMdd");                string extension = System.IO.Path.GetExtension(file.FileName);//扩展名                 string FileName = Convert.ToString(Guid.NewGuid()).Replace("-", "") + extension;//文件名=文件名+当前上传时间                  FilePath = fileName + "/" + Convert.ToString(DateTime.Now.Year) + "/" + Convert.ToString(DateTime.Now.Month) + "/" + FileName;//云文件保存路径                                  try                {                    //初始化阿里云配置--外网Endpoint、访问ID、访问password                      OssClient aliyun = new OssClient(endpoint, accessKeyId, accessKeySecret);                    //将文件md5值赋值给meat头信息，服务器验证文件MD5                      var objectMeta = new ObjectMetadata                    {                        ContentMd5 = md5,                        ContentType = "application/octet-stream",                    };                    //文件上传--空间名、文件保存路径、文件流、meta头信息(文件md5) //返回meta头信息(文件md5)                      PutObjectResult por = aliyun.PutObject(BucketName, FilePath, fileStream, objectMeta);                    string text = por.ETag;                    if (extension.ToUpper() == ".JPG")                    {                        FilePath += "-big";                    }                }                catch (Exception e)                {                    ICE.Core.LogHelper.ErrorLog(log, string.Format("图片上传OSS出错了：{0}", Convert.ToString(e.Message)));                    FilePath = "";                }            }            return FilePath;        }