1 public static class FTPHelper 2 { 3 /// <summary> 4 /// 得到特定FTP目录的文件列表 5 /// </summary> 6 /// <param name="uri">ftp://{username}:{password}@ftp.baidu.com/{folderName}</param> 7 public static List<String> ListFiles(Uri serverUri) 8 { 9 // The serverUri parameter should start with the ftp:// scheme. 10 if (serverUri.Scheme != Uri.UriSchemeFtp) 11 { 12 throw new ArgumentException("uri must be ftp scheme"); 13 } 14 15 FtpWebRequest ftpRequest = null; 16 StreamReader reader = null; 17 try 18 { 19 // Get the object used to communicate with the server. 20 ftpRequest = (FtpWebRequest)FtpWebRequest.Create(serverUri); 21 22 ftpRequest.Method = WebRequestMethods.Ftp.ListDirectory; 23 24 reader = new StreamReader(ftpRequest.GetResponse().GetResponseStream(), Encoding.Default); 25 26 //read data. 27 List<String> fileNames = new List<String>(); 28 string line = reader.ReadLine(); 29 while (line != null) 30 { 31 32 fileNames.Add(line); 33 line = reader.ReadLine(); 34 } 35 36 return fileNames; 37 38 } 39 catch(Exception ex) 40 { 41 throw ex; 42 } 43 finally 44 { 45 if(reader != null) 46 { 47 reader.Close(); 48 } 49 if (ftpRequest != null) 50 { 51 ftpRequest.Abort(); 52 } 53 } 54 } 55 56 /// <summary> 57 /// 得到特定文件的大小 58 /// </summary> 59 /// <param name="uri">ftp://{username}:{password}@ftp.baidu.com/{fileName}</param> 60 public static long GetFileSize(Uri serverUri) 61 { 62 // The serverUri parameter should start with the ftp:// scheme. 63 if (serverUri.Scheme != Uri.UriSchemeFtp) 64 { 65 throw new ArgumentException("uri must be ftp scheme"); 66 } 67 68 FtpWebRequest ftpRequest = null; 69 StreamReader reader = null; 70 try 71 { 72 // Get the object used to communicate with the server. 73 ftpRequest = (FtpWebRequest)FtpWebRequest.Create(serverUri); 74 75 ftpRequest.Method = WebRequestMethods.Ftp.GetFileSize; 76 77 return ftpRequest.GetResponse().ContentLength; 78 } 79 catch (Exception ex) 80 { 81 throw ex; 82 } 83 finally 84 { 85 if (reader != null) 86 { 87 reader.Close(); 88 } 89 if (ftpRequest != null) 90 { 91 ftpRequest.Abort(); 92 } 93 } 94 } 95 }
调用ListFile方法把FTP特定目录的所有文件列表显示在web页面上，当单击名称时，下载文件
/// <summary> /// 下载文件（此方法定义在实现Controller某类的某个MVC Controller中） /// </summary> /// <param name="uri"></param> public void DownLoadFile(Uri uri,string fileName) { //Create a stream for the file Stream stream = null; //This controls how many bytes to read at a time and send to the client int bytesToRead = 10000; // Buffer to read bytes in chunk size specified above byte[] buffer = new Byte[bytesToRead]; // The number of bytes read try { long fileSize = FTPHelper.GetFileSize(uri); //Create a WebRequest to get the file FtpWebRequest fileReq = (FtpWebRequest)FtpWebRequest.Create(uri); //Create a response for this request FtpWebResponse fileResp = (FtpWebResponse)fileReq.GetResponse(); //Get the Stream returned from the response stream = fileResp.GetResponseStream(); // prepare the response to the client. resp is the client Response var resp = HttpContext.Response; //Indicate the type of data being sent resp.ContentType = "application/octet-stream"; //Name the file resp.AddHeader("Content-Disposition", "attachment; filename="" + fileName + """); resp.AddHeader("Content-Length", fileSize.ToString()); int length; do { // Verify that the client is connected. if (resp.IsClientConnected) { // Read data into the buffer. length = stream.Read(buffer, 0, bytesToRead); // and write it out to the response's output stream resp.OutputStream.Write(buffer, 0, length); // Flush the data resp.Flush(); //Clear the buffer buffer = new Byte[bytesToRead]; } else { // cancel the download if client has disconnected length = -1; } } while (length > 0); //Repeat until no data is read } finally { if (stream != null) { //Close the input stream stream.Close(); } } }