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(" --" + strBoundary + "-- "); 18 //请求头部信息 19 StringBuilder sb = new StringBuilder(); 20 sb.Append("--"); 21 sb.Append(strBoundary); 22 sb.Append(" "); 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(" "); 29 sb.Append("Content-Type: "); 30 sb.Append("application/octet-stream"); 31 sb.Append(" "); 32 sb.Append(" "); 33 string strPostHeader = sb.ToString(); 34 System.Console.Write(strPostHeader); 35 System.Console.Write("文件内容...."); 36 System.Console.Write(" --" + strBoundary + "-- "); 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 }