FTP是一個8位的客戶端-伺服器協議,能操作任何類型的文件而不需要進一步處理,就像MIME或Unicode一樣。可以通過C#中的FtpWebRequest類、NetworkCredential類、WebRequestMethods類來實現一個FTP操作的相關輔助類FTPHelper。 先來看MSDN ...
FTP是一個8位的客戶端-伺服器協議,能操作任何類型的文件而不需要進一步處理,就像MIME或Unicode一樣。可以通過C#中的FtpWebRequest類、NetworkCredential類、WebRequestMethods類來實現一個FTP操作的相關輔助類FTPHelper。
先來看MSDN關於上述幾個類的定義以及解釋:
FtpWebRequest類:實現文件傳輸協議 (FTP) 客戶端。若要獲取的實例FtpWebRequest,使用Create方法。 此外可以使用WebClient類來上傳和下載信息從 FTP 伺服器。 使用任一種方法,當您指定使用 FTP 方案的網路資源 (例如, "ftp://contoso.com"
)FtpWebRequest類提供了能夠以編程方式與 FTP 伺服器進行交互。
NetworkCredential類:為基於密碼的身份驗證方案(如基本、摘要式、NTLM 和 Kerberos 身份驗證)提供憑據。
WebRequestMethods類:WebRequestMethods.Ftp、WebRequestMethods.File 和 WebRequestMethods.Http 類的容器類。 無法繼承此類。
封裝好的FTPHelper幫助類如下,包含連接FTP伺服器、上傳文件到FTP伺服器、下載FTP伺服器文件、刪除FTP伺服器文件、獲取當前目錄下明細等幾個常用方法。具體實現如下:
public class FTPHelper { #region 欄位 string ftpURI; string ftpUserID; string ftpServerIP; string ftpPassword; string ftpRemotePath; #endregion /// <summary> /// 連接FTP伺服器 /// </summary> /// <param name="FtpServerIP">FTP連接地址</param> /// <param name="FtpRemotePath">指定FTP連接成功後的當前目錄, 如果不指定即預設為根目錄</param> /// <param name="FtpUserID">用戶名</param> /// <param name="FtpPassword">密碼</param> public FTPHelper(string FtpServerIP, string FtpRemotePath, string FtpUserID, string FtpPassword) { ftpServerIP = FtpServerIP; ftpRemotePath = FtpRemotePath; ftpUserID = FtpUserID; ftpPassword = FtpPassword; ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/"; } /// <summary> /// 上傳 /// </summary> public void Upload(string filename) { FileInfo fileInf = new FileInfo(filename); FtpWebRequest reqFTP; reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileInf.Name)); reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword); reqFTP.Method = WebRequestMethods.Ftp.UploadFile; reqFTP.KeepAlive = false; reqFTP.UseBinary = true; reqFTP.ContentLength = fileInf.Length; int buffLength = 2048; byte[] buff = new byte[buffLength]; int contentLen; FileStream fs = fileInf.OpenRead(); try { Stream strm = reqFTP.GetRequestStream(); contentLen = fs.Read(buff, 0, buffLength); while (contentLen != 0) { strm.Write(buff, 0, contentLen); contentLen = fs.Read(buff, 0, buffLength); } strm.Close(); fs.Close(); } catch (Exception ex) { throw new Exception(ex.Message); } } /// <summary> /// 下載 /// </summary> public void Download(string filePath, string fileName) { try { FileStream outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create); FtpWebRequest reqFTP; reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileName)); reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword); reqFTP.Method = WebRequestMethods.Ftp.DownloadFile; reqFTP.UseBinary = true; FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse(); Stream ftpStream = response.GetResponseStream(); long cl = response.ContentLength; int bufferSize = 2048; int readCount; byte[] buffer = new byte[bufferSize]; readCount = ftpStream.Read(buffer, 0, bufferSize); while (readCount > 0) { outputStream.Write(buffer, 0, readCount); readCount = ftpStream.Read(buffer, 0, bufferSize); } ftpStream.Close(); outputStream.Close(); response.Close(); } catch (Exception ex) { throw new Exception(ex.Message); } } /// <summary> /// 刪除文件 /// </summary> public void Delete(string fileName) { try { FtpWebRequest reqFTP; reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileName)); reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword); reqFTP.Method = WebRequestMethods.Ftp.DeleteFile; reqFTP.KeepAlive = false; string result = String.Empty; FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse(); long size = response.ContentLength; Stream datastream = response.GetResponseStream(); StreamReader sr = new StreamReader(datastream); result = sr.ReadToEnd(); sr.Close(); datastream.Close(); response.Close(); } catch (Exception ex) { throw new Exception(ex.Message); } } /// <summary> /// 獲取當前目錄下明細(包含文件和文件夾) /// </summary> public string[] GetFilesDetailList() { try { StringBuilder result = new StringBuilder(); FtpWebRequest ftp; ftp = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI)); ftp.Credentials = new NetworkCredential(ftpUserID, ftpPassword); ftp.Method = WebRequestMethods.Ftp.ListDirectoryDetails; WebResponse response = ftp.GetResponse(); StreamReader reader = new StreamReader(response.GetResponseStream()); string line = reader.ReadLine(); line = reader.ReadLine(); line = reader.ReadLine(); while (line != null) { result.Append(line); result.Append("\n"); line = reader.ReadLine(); } result.Remove(result.ToString().LastIndexOf("\n"), 1); reader.Close(); response.Close(); return result.ToString().Split('\n'); } catch (Exception ex) { throw new Exception(ex.Message); } } /// <summary> /// 獲取FTP文件列表(包括文件夾) /// </summary> private string[] GetAllList(string url) { List<string> list = new List<string>(); FtpWebRequest req = (FtpWebRequest)WebRequest.Create(new Uri(url)); req.Credentials = new NetworkCredential(ftpPassword, ftpPassword); req.Method = WebRequestMethods.Ftp.ListDirectory; req.UseBinary = true; req.UsePassive = true; try { using (FtpWebResponse res = (FtpWebResponse)req.GetResponse()) { using (StreamReader sr = new StreamReader(res.GetResponseStream())) { string s; while ((s = sr.ReadLine()) != null) { list.Add(s); } } } } catch (Exception ex) { throw (ex); } return list.ToArray(); } /// <summary> /// 獲取當前目錄下文件列表(不包括文件夾) /// </summary> public string[] GetFileList(string url) { StringBuilder result = new StringBuilder(); FtpWebRequest reqFTP; try { reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(url)); reqFTP.UseBinary = true; reqFTP.Credentials = new NetworkCredential(ftpPassword, ftpPassword); reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails; WebResponse response = reqFTP.GetResponse(); StreamReader reader = new StreamReader(response.GetResponseStream()); string line = reader.ReadLine(); while (line != null) { if (line.IndexOf("<DIR>") == -1) { result.Append(Regex.Match(line, @"[\S]+ [\S]+", RegexOptions.IgnoreCase).Value.Split(' ')[1]); result.Append("\n"); } line = reader.ReadLine(); } result.Remove(result.ToString().LastIndexOf('\n'), 1); reader.Close(); response.Close(); } catch (Exception ex) { throw (ex); } return result.ToString().Split('\n'); } /// <summary> /// 判斷當前目錄下指定的文件是否存在 /// </summary> /// <param name="RemoteFileName">遠程文件名</param> public bool FileExist(string RemoteFileName) { string[] fileList = GetFileList("*.*"); foreach (string str in fileList) { if (str.Trim() == RemoteFileName.Trim()) { return true; } } return false; } /// <summary> /// 創建文件夾 /// </summary> public void MakeDir(string dirName) { FtpWebRequest reqFTP; try { reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + dirName)); reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory; reqFTP.UseBinary = true; reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword); FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse(); Stream ftpStream = response.GetResponseStream(); ftpStream.Close(); response.Close(); } catch (Exception ex) { } } /// <summary> /// 獲取指定文件大小 /// </summary> public long GetFileSize(string filename) { FtpWebRequest reqFTP; long fileSize = 0; try { reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + filename)); reqFTP.Method = WebRequestMethods.Ftp.GetFileSize; reqFTP.UseBinary = true; reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword); FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse(); Stream ftpStream = response.GetResponseStream(); fileSize = response.ContentLength; ftpStream.Close(); response.Close(); } catch (Exception ex) { } return fileSize; } /// <summary> /// 更改文件名 /// </summary> public void ReName(string currentFilename, string newFilename) { FtpWebRequest reqFTP; try { reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + currentFilename)); reqFTP.Method = WebRequestMethods.Ftp.Rename; reqFTP.RenameTo = newFilename; reqFTP.UseBinary = true; reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword); FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse(); Stream ftpStream = response.GetResponseStream(); ftpStream.Close(); response.Close(); } catch (Exception ex) { } } /// <summary> /// 移動文件 /// </summary> public void MovieFile(string currentFilename, string newDirectory) { ReName(currentFilename, newDirectory); } /// <summary> /// 切換當前目錄 /// </summary> /// <param name="IsRoot">true:絕對路徑 false:相對路徑</param> public void GotoDirectory(string DirectoryName, bool IsRoot) { if (IsRoot) { ftpRemotePath = DirectoryName; } else { ftpRemotePath += DirectoryName + "/"; } ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/"; } }
備註:此文章轉載自C#工具類:FTP操作輔助類FTPHelper_IT技術小趣屋。