个人收藏--未整理—C# http/https 上传下载文件

c# HTTP/HTTPS 文件上传。

分类： .net 2015-02-03 08:36 541人阅读 评论(0) 收藏 举报

方法主体

[csharp] view plaincopy

1. public static string MyUploader(string strFileToUpload, string strUrl, string strFileFormName, NameValueCollection querystring, CookieContainer cookies) 
2.         { 
3. string postdata; 
4.             postdata = "?"; 
5. if (querystring != null) 
6.             { 
7. foreach (string key in querystring.Keys) 
8.                 { 
9.                     postdata += key + "=" + querystring.Get(key) + "&"; 
10.                 } 
11.             } 
12. //Uri uri = new Uri(strUrl + postdata);
13.             Uri oUri = new Uri(strUrl + postdata); 
14. string strBoundary = "----------" + DateTime.Now.Ticks.ToString("x"); 
15. // The trailing boundary string
16. byte[] boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + strBoundary + "\r\n"); 
17. // The post message header
18.             StringBuilder sb = new StringBuilder(); 
19.             sb.Append("--"); 
20.             sb.Append(strBoundary); 
21.             sb.Append("\r\n"); 
22.             sb.Append("Content-Disposition: form-data; name=\""); 
23.             sb.Append(strFileFormName); 
24.             sb.Append("\"; filename=\""); 
25.             sb.Append(Path.GetFileName(strFileToUpload)); 
26.             sb.Append("\""); 
27.             sb.Append("\r\n"); 
28.             sb.Append("Content-Type: "); 
29.             sb.Append("application/octet-stream"); 
30.             sb.Append("\r\n"); 
31.             sb.Append("\r\n"); 
32. string strPostHeader = sb.ToString(); 
33. byte[] postHeaderBytes = Encoding.UTF8.GetBytes(strPostHeader); 
34. // The WebRequest
35.             HttpWebRequest oWebrequest = (HttpWebRequest)WebRequest.Create(oUri); 
36. //如果是发送HTTPS请求 
37. if (strUrl.StartsWith("https", StringComparison.OrdinalIgnoreCase)) 
38.             { 
39.                 ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult); 
40.                 oWebrequest = WebRequest.Create(oUri) as HttpWebRequest; 
41.                 oWebrequest.ProtocolVersion = HttpVersion.Version10; 
42.             } 
43. else
44.             { 
45.                 oWebrequest = WebRequest.Create(oUri) as HttpWebRequest; 
46.             } 
47.             oWebrequest.ContentType = "multipart/form-data; boundary=" + strBoundary; 
48.             oWebrequest.Method = "POST"; 
49. // This is important, otherwise the whole file will be read to memory anyway...
50.             oWebrequest.AllowWriteStreamBuffering = false; 
51. // Get a FileStream and set the final properties of the WebRequest
52.             FileStream oFileStream = new FileStream(strFileToUpload, FileMode.Open, FileAccess.Read); 
53. long length = postHeaderBytes.Length + oFileStream.Length + boundaryBytes.Length; 
54.             oWebrequest.ContentLength = length; 
55.             Stream oRequestStream = oWebrequest.GetRequestStream(); 
56. // Write the post header
57.             oRequestStream.Write(postHeaderBytes, 0, postHeaderBytes.Length); 
58. // Stream the file contents in small pieces (4096 bytes, max).
59. byte[] buffer = new Byte[checked((uint)Math.Min(4096, (int)oFileStream.Length))]; 
60. int bytesRead = 0; 
61. while ((bytesRead = oFileStream.Read(buffer, 0, buffer.Length)) != 0) 
62.                 oRequestStream.Write(buffer, 0, bytesRead); 
63.             oFileStream.Close(); 
64. // Add the trailing boundary
65.             oRequestStream.Write(boundaryBytes, 0, boundaryBytes.Length); 
66.             WebResponse oWResponse = oWebrequest.GetResponse(); 
67.             Stream s = oWResponse.GetResponseStream(); 
68.             StreamReader sr = new StreamReader(s); 
69.             String sReturnString = sr.ReadToEnd(); 
70. // Clean up
71.             oFileStream.Close(); 
72.             oRequestStream.Close(); 
73.             s.Close(); 
74.             sr.Close(); 
75. return sReturnString; 
76.         } 

[csharp] view plaincopy

1. private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) 
2.         { 
3. return true; //总是接受 
4.         } 

调用方法

[csharp] view plaincopy

1. CookieContainer cookies = new CookieContainer(); 
2. //add or use cookies 
3. NameValueCollection querystring = new NameValueCollection(); 
4. querystring["login_id"] = "your userid"; 
5. querystring["password"] = "your password"; 
6. string uploadfile = @"C:\Test.zip";// set to file to upload 
7. string outdata = MyUploader(filePath, updateUrl, "zipfile", querystring, cookies);