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.

  1 　　　　 ///<summary>

  2         /// 将本地文件上传到指定的服务器(HttpWebRequest方法)

  3         /// </summary>

  4         /// <param name="address">文件上传到的服务器</param>

  5         /// <param name="fileNamePath">要上传的本地文件（全路径）</param>

  6         /// <param name="saveName">文件上传后的名称</param>

  7         /// <param name="progressBar">上传进度条</param>

  8         /// <returns>成功返回1，失败返回0</returns>

  9         private string UploadRequest(string url, string filePath, string fileName)

 10         {

 11             string returnValue = "";

 12             // 要上传的文件

 13             FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);

 14             BinaryReader r = new BinaryReader(fs);

 15             //时间戳

 16             string strBoundary = "----------" + DateTime.Now.Ticks.ToString("x");

 17             byte[] boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + strBoundary + "--\r\n");

 18             //请求头部信息

 19             StringBuilder sb = new StringBuilder();

 20             sb.Append("--");

 21             sb.Append(strBoundary);

 22             sb.Append("\r\n");

 23             sb.Append("Content-Disposition: form-data; name=\"");

 24             sb.Append("file");

 25             sb.Append("\"; filename=\"");

 26             sb.Append(fileName);

 27             sb.Append("\"");

 28             sb.Append("\r\n");

 29             sb.Append("Content-Type: ");

 30             sb.Append("application/octet-stream");

 31             sb.Append("\r\n");

 32             sb.Append("\r\n");

 33             string strPostHeader = sb.ToString();

 34             System.Console.Write(strPostHeader);

 35             System.Console.Write("文件内容....");

 36             System.Console.Write("\r\n--" + strBoundary + "--\r\n");

 37             byte[] postHeaderBytes = Encoding.UTF8.GetBytes(strPostHeader);

 38             // 根据uri创建HttpWebRequest对象

 39             HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(new Uri(url));

 40             httpReq.Method = "POST";

 41             //对发送的数据不使用缓存

 42             httpReq.AllowWriteStreamBuffering = false;

 43             //设置获得响应的超时时间（300秒）

 44             httpReq.Timeout = 300000;

 45             httpReq.ContentType = "multipart/form-data; boundary=" + strBoundary;

 46             long length = fs.Length + postHeaderBytes.Length + boundaryBytes.Length;

 47             long fileLength = fs.Length;

 48             httpReq.ContentLength = length;//请求内容长度

 49             try

 50             {

 51                 //每次上传5M

 52                 int bufferLength = 1024 * 1024 * 5;

 53                 byte[] buffer = new byte[bufferLength];

 54                 //已上传的字节数

 55                 long offset = 0;

 56                 //开始上传时间

 57                 DateTime startTime = DateTime.Now;

 58                 int size = r.Read(buffer, 0, bufferLength);

 59                 Stream postStream = httpReq.GetRequestStream();

 60                 //发送请求头部消息

 61                 postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);

 62                 while (size > 0)

 63                 {

 64                     postStream.Write(buffer, 0, size);

 65                     offset += size;

 66                     

 67                     TimeSpan span = DateTime.Now - startTime;

 68                     double second = span.TotalSeconds;

 69                     lblTime.Text = "已用时：" + second.ToString("F2") + "秒";

 70                     if (second > 0.001)

 71                     {

 72                         lblSpeed.Text = " 平均速度：" + (offset / 1024 / second).ToString("0.00") + "KB/秒";

 73                     }

 74                     else

 75                     {

 76                         lblSpeed.Text = " 正在连接…";

 77                     }

 78                     lblState.Text = "已上传：" + (offset * 100.0 / length).ToString("F2") + "%";

 79                     lblSize.Text = (offset / 1048576.0).ToString("F2") + "M/" + (fileLength / 1048576.0).ToString("F2") + "M";

 80 

 81                     size = r.Read(buffer, 0, bufferLength);

 82                 }

 83                 //添加尾部的时间戳

 84                 postStream.Write(boundaryBytes, 0, boundaryBytes.Length);

 85                 postStream.Close();

 86                 //获取服务器端的响应

 87                 WebResponse webResponse = httpReq.GetResponse();

 88                 Stream s = webResponse.GetResponseStream();

 89                 StreamReader sr = new StreamReader(s);

 90                 //读取服务器端返回的消息

 91                 returnValue = sr.ReadLine();

 92                 s.Close();

 93                 sr.Close();

 94                 

 95             }

 96             catch(Exception ex)

 97             {

 98                 returnValue = ex.Message + ex.StackTrace;

 99             }

100             finally

101             {

102                 fs.Close();

103                 r.Close();

104             }

105             return returnValue;

106         }