1 private string HttpUploadFile(string url, string file, string paramName, string contentType, NameValueCollection nvc, object status) {
2 //log.Debug(string.Format("Uploading {0} to {1}", file, url));
3 string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
4 byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
5
6 HttpWebRequest wr = (HttpWebRequest)WebRequest.Create(url);
7 wr.ContentType = "multipart/form-data; boundary=" + boundary;
8 wr.Method = "POST";
9 wr.KeepAlive = true;
10 wr.Credentials = System.Net.CredentialCache.DefaultCredentials;
11 //wr.ContentLength
12 //wr.AllowWriteStreamBuffering = false;
13 //Stream rs = wr.GetRequestStream();
14 MemoryStream ms = new MemoryStream();
15
16 string formdataTemplate = "Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";
17 foreach (string key in nvc.Keys) {
18 ms.Write(boundarybytes, 0, boundarybytes.Length);
19 string formitem = string.Format(formdataTemplate, key, nvc[key]);
20 byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);
21 ms.Write(formitembytes, 0, formitembytes.Length);
22 }
23 ms.Write(boundarybytes, 0, boundarybytes.Length);
24
25 string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: {2}\r\n\r\n";
26 string header = string.Format(headerTemplate, paramName, file, contentType);
27 byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
28 ms.Write(headerbytes, 0, headerbytes.Length);
29
30 FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read);
31 byte[] trailer = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
32
33 wr.ContentLength = ms.Length + fileStream.Length + trailer.Length;
34 wr.AllowWriteStreamBuffering = false;
35 //设置超时时间 一定要设置 不然连接会被关闭 设置超时时间为1小时
36 wr.Timeout = 1000 * 3600;
37 wr.ReadWriteTimeout = 1000 * 3600;//当服务器5
38
39 Stream rs = wr.GetRequestStream();
40 byte[] buffer = new byte[4096];
41 long count = 0;
42 ms.Position = 0;
43 while (true) {
44 Array.Clear(buffer, 0, buffer.Length);
45
46 int readlen = ms.Read(buffer, 0, buffer.Length);
47 if (readlen <= 0) {
48 break;
49 }
50 rs.Write(buffer, 0, readlen);
51 //rs.Flush();
52 }
53
54 int bytesRead = 0;
55 while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) >0) {
56 count += bytesRead;
57 rs.Write(buffer, 0, bytesRead);
58 //rs.Flush();
59 if (this.OnUploadProgressChanged != null) {
60 try {
61 this.OnUploadProgressChanged(status, ((double)count / (double)fileStream.Length)*100d);
62 } catch (Exception ex) {
63
64 }
65 }
66 }
67 fileStream.Close();
68
69 //byte[] trailer = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
70 rs.Write(trailer, 0, trailer.Length);
71 rs.Flush();
72 rs.Close();
73
74 WebResponse wresp = null;
75 try {
76 //System.Threading.Thread.Sleep(3000);
77 wresp = wr.GetResponse();
78 Stream stream2 = wresp.GetResponseStream();
79 StreamReader reader2 = new StreamReader(stream2);
80 return reader2.ReadToEnd();
81
82 //log.Debug(string.Format("File uploaded, server response is: {0}", reader2.ReadToEnd()));
83 } catch (Exception ex) {
84 //log.Error("Error uploading file", ex);
85 if (wresp != null) {
86 wresp.Close();
87 wresp = null;
88 }
89 return null;
90 } finally {
91 wr = null;
92 }
93 }
contentType参数配置为application/octet-stream即可
重要参数
AllowWriteStreamBuffering = false
另超时时间必须设置得长一些，不然连接会被关闭 会抛出404错误
