将本地文件上传到指定的服务器(HttpWebRequest方法)

将本地文件上传到指定的服务器(HttpWebRequest方法),通过文件流,带文件名,同文件一同上传的表单文本域及值.

 　　　　 ///<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>
         /// <param name="saveName">文件上传后的名称</param>
         /// <param name="progressBar">上传进度条</param>
         /// <returns>成功返回1，失败返回0</returns>
         private string UploadRequest(string url, string filePath, string fileName)
         {
             string returnValue = "";
             // 要上传的文件
             FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
             BinaryReader r = new BinaryReader(fs);
             //时间戳
             string strBoundary = "----------" + DateTime.Now.Ticks.ToString("x");
             byte[] boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + strBoundary + "--\r\n");
             //请求头部信息
             StringBuilder sb = new StringBuilder();
             sb.Append("--");
             sb.Append(strBoundary);
             sb.Append("\r\n");
             sb.Append("Content-Disposition: form-data; name=\"");
             sb.Append("file");
             sb.Append("\"; filename=\"");
             sb.Append(fileName);
             sb.Append("\"");
             sb.Append("\r\n");
             sb.Append("Content-Type: ");
             sb.Append("application/octet-stream");
             sb.Append("\r\n");
             sb.Append("\r\n");
             string strPostHeader = sb.ToString();
             System.Console.Write(strPostHeader);
             System.Console.Write("文件内容....");
             System.Console.Write("\r\n--" + strBoundary + "--\r\n");
             byte[] postHeaderBytes = Encoding.UTF8.GetBytes(strPostHeader);
             // 根据uri创建HttpWebRequest对象
             HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(new Uri(url));
             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 = ;
             httpReq.ContentType = "multipart/form-data; boundary=" + strBoundary;
             long length = fs.Length + postHeaderBytes.Length + boundaryBytes.Length;
             long fileLength = fs.Length;
             httpReq.ContentLength = length;//请求内容长度
             try
             {
                 //每次上传5M
                 int bufferLength =  *  * ;
                 byte[] buffer = new byte[bufferLength];
                 //已上传的字节数
                 long offset = ;
                 //开始上传时间
                 DateTime startTime = DateTime.Now;
                 int size = r.Read(buffer, , bufferLength);
                 Stream postStream = httpReq.GetRequestStream();
                 //发送请求头部消息
                 postStream.Write(postHeaderBytes, , postHeaderBytes.Length);
                 while (size > )
                 {
                     postStream.Write(buffer, , size);
                     offset += size;

                     TimeSpan span = DateTime.Now - startTime;
                     double second = span.TotalSeconds;
                     lblTime.Text = "已用时：" + second.ToString("F2") + "秒";
                     if (second > 0.001)
                     {
                         lblSpeed.Text = " 平均速度：" + (offset /  / second).ToString("0.00") + "KB/秒";
                     }
                     else
                     {
                         lblSpeed.Text = " 正在连接…";
                     }
                     lblState.Text = "已上传：" + (offset * 100.0 / length).ToString("F2") + "%";
                     lblSize.Text = (offset / 1048576.0).ToString("F2") + "M/" + (fileLength / 1048576.0).ToString("F2") + "M";

                     size = r.Read(buffer, , bufferLength);
                 }
                 //添加尾部的时间戳
                 postStream.Write(boundaryBytes, , boundaryBytes.Length);
                 postStream.Close();
                 //获取服务器端的响应
                 WebResponse webResponse = httpReq.GetResponse();
                 Stream s = webResponse.GetResponseStream();
                 StreamReader sr = new StreamReader(s);
                 //读取服务器端返回的消息
                 returnValue = sr.ReadLine();
                 s.Close();
                 sr.Close();

             }
             catch(Exception ex)
             {
                 returnValue = ex.Message + ex.StackTrace;
             }
             finally
             {
                 fs.Close();
                 r.Close();
             }
             return returnValue;
         }