使用HttpWebRequest实现文件的发送

        /// <summary>
        /// 将本地文件上传到指定的服务器(HttpWebRequest方法)
        /// </summary>
        /// <param name="address">文件上传到的服务器</param>
        /// <param name="fileNamePath">要上传的本地文件（全路径）</param>
        /// <returns>成功返回1，失败返回0</returns>
        public int Upload_Request(string address, string fileNamePath)
        {
            int returnValue = 0;
            // 要上传的文件
            FileStream fs = new FileStream(fileNamePath, FileMode.Open, FileAccess.Read);
            BinaryReader r = new BinaryReader(fs, Encoding.UTF8);

            // 根据uri创建HttpWebRequest对象
            HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(new Uri(address));
            httpReq.Method = "POST";
            //对发送的数据不使用缓存
            httpReq.AllowWriteStreamBuffering = false;
            //设置获得响应的超时时间（300秒）
            httpReq.Timeout = 300000;
            httpReq.ContentType = "application/octet-stream";
            long length = fs.Length;
            long fileLength = fs.Length;
            httpReq.ContentLength = length;

            try
            {
                //每次上传4k
                int bufferLength = 4096;
                byte[] buffer = new byte[bufferLength];
                //已上传的字节数
                long offset = 0;
                //开始上传时间
                DateTime startTime = DateTime.Now;
                int size = r.Read(buffer, 0, bufferLength);
                Stream postStream = httpReq.GetRequestStream();
                while (size > 0)
                {
                    postStream.Write(buffer, 0, size);
                    offset += size;
                    TimeSpan span = DateTime.Now - startTime;
                    double second = span.TotalSeconds;
                    size = r.Read(buffer, 0, bufferLength);
                }
                postStream.Close();
                //获取服务器端的响应
                WebResponse webRespon = httpReq.GetResponse();
                Stream s = webRespon.GetResponseStream();
                StreamReader sr = new StreamReader(s, Encoding.UTF8);
                //读取服务器端返回的消息
                String sReturnString = sr.ReadToEnd().Trim();
                int i = sReturnString.IndexOf(":") + 1;
                int j = sReturnString.IndexOf(",");
                int len = j - i;
                string _check = sReturnString.Substring(i, len);
                if (_check == "0")
                {
                    returnValue = 1;
                }
                s.Close();
                sr.Close();
            }
            catch (Exception ex)
            {
                log.Error("发送文件到" + address + "失败", ex);
            }
            finally
            {
                fs.Close();
                r.Close();
            }
            return returnValue;
        }