FTP Factory

技术2022-05-11 66

--使用示例-- /*FTPFactory.csBetter view with tab space=4 Written by Jaimon Mathew (jaimonmathew@rediffmail.com)Rolander,Dan (Dan.Rolander@marriott.com) has modified the downloadmethod to cope with file name with path information. He also providedthe XML comments so that the library provides Intellisense descriptions. use the following line to compilecsc /target:library /out:FTPLib.dll /r:System.DLL FTPFactory.cs*/ using System; using System.Net; using System.IO; using System.Text; using System.Net.Sockets; namespace FtpLib { public class FTPFactory { private string remoteHost, remotePath, remoteUser, remotePass, mes; private int remotePort, bytes; private Socket clientSocket; private int retValue; private Boolean debug; private Boolean logined; private string reply; private static int BLOCK_SIZE = 512; Byte[] buffer = new Byte[BLOCK_SIZE]; Encoding ASCII = Encoding.ASCII; public FTPFactory() { remoteHost = "localhost"; remotePath = "."; remoteUser = "anonymous"; remotePass = "jaimon@school2000.co.uk"; remotePort = 21; debug = false; logined = false; } /// /// Set the name of the FTP server to connect to. /// /// Server name public void setRemoteHost(string remoteHost) { this.remoteHost = remoteHost; } /// /// Return the name of the current FTP server. /// /// Server name public string getRemoteHost() { return remoteHost; } /// /// Set the port number to use for FTP. /// /// Port number public void setRemotePort(int remotePort) { this.remotePort = remotePort; } /// /// Return the current port number. /// /// Current port number public int getRemotePort() { return remotePort; } /// /// Set the remote directory path. /// /// The remote directory path public void setRemotePath(string remotePath) { this.remotePath = remotePath; } /// /// Return the current remote directory path. /// /// The current remote directory path. public string getRemotePath() { return remotePath; } /// /// Set the user name to use for logging into the remote server. /// /// Username public void setRemoteUser(string remoteUser) { this.remoteUser = remoteUser; } /// /// Set the password to user for logging into the remote server. /// /// Password public void setRemotePass(string remotePass) { this.remotePass = remotePass; } /// /// Return a string array containing the remote directory's file list. /// /// /// public string[] getFileList(string mask) { if (!logined) { login(); } Socket cSocket = createDataSocket(); sendCommand("NLST " + mask); if (!(retValue == 150 || retValue == 125)) { throw new IOException(reply.Substring(4)); } mes = ""; while (true) { int bytes = cSocket.Receive(buffer, buffer.Length, 0); mes += System.Text.Encoding.GetEncoding("gb2312").GetString(buffer, 0, bytes); if (bytes < buffer.Length) { break; } } char[] seperator = { ' ' }; string[] mess = mes.Split(seperator); cSocket.Close(); readReply(); if (retValue != 226) { throw new IOException(reply.Substring(4)); } return mess; } /// /// Return the size of a file. /// /// /// public long getFileSize(string fileName) { if (!logined) { login(); } sendCommand("SIZE " + fileName); long size = 0; if (retValue == 213) { size = Int64.Parse(reply.Substring(4)); } else { throw new IOException(reply.Substring(4)); } return size; } /// /// Login to the remote server. /// public void login() { clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPEndPoint ep = new IPEndPoint(Dns.Resolve(remoteHost).AddressList[0], remotePort); try { clientSocket.Connect(ep); } catch (Exception) { throw new IOException("Couldn't connect to remote server"); } readReply(); if (retValue != 220) { close(); throw new IOException(reply.Substring(4)); } if (debug) Console.WriteLine("USER " + remoteUser); sendCommand("USER " + remoteUser); if (!(retValue == 331 || retValue == 230)) { cleanup(); throw new IOException(reply.Substring(4)); } if (retValue != 230) { if (debug) Console.WriteLine("PASS xxx"); sendCommand("PASS " + remotePass); if (!(retValue == 230 || retValue == 202)) { cleanup(); throw new IOException(reply.Substring(4)); } } logined = true; Console.WriteLine("Connected to " + remoteHost); chdir(remotePath); } /// /// If the value of mode is true, set binary mode for downloads. /// Else, set Ascii mode. /// /// public void setBinaryMode(Boolean mode) { if (mode) { sendCommand("TYPE I"); } else { sendCommand("TYPE A"); } if (retValue != 200) { throw new IOException(reply.Substring(4)); } } /// /// Download a file to the Assembly's local directory, /// keeping the same file name. /// /// public void download(string remFileName) { download(remFileName, "", false); } /// /// Download a remote file to the Assembly's local directory, /// keeping the same file name, and set the resume flag. /// /// /// public void download(string remFileName, Boolean resume) { download(remFileName, "", resume); } /// /// Download a remote file to a local file name which can include /// a path. The local file name will be created or overwritten, /// but the path must exist. /// /// /// public void download(string remFileName, string locFileName) { download(remFileName, locFileName, false); } /// /// Download a remote file to a local file name which can include /// a path, and set the resume flag. The local file name will be /// created or overwritten, but the path must exist. /// /// /// /// public void download(string remFileName, string locFileName, Boolean resume) { if (!logined) { login(); } setBinaryMode(true); Console.WriteLine("Downloading file " + remFileName + " from " + remoteHost + "/" + remotePath); if (locFileName.Equals("")) { locFileName = remFileName; } if (!File.Exists(locFileName)) { Stream st = File.Create(locFileName); st.Close(); } FileStream output = new FileStream(locFileName, FileMode.Open); Socket cSocket = createDataSocket(); long offset = 0; if (resume) { offset = output.Length; if (offset > 0) { sendCommand("REST " + offset); if (retValue != 350) { //throw new IOException(reply.Substring(4)); //Some servers may not support resuming. offset = 0; } } if (offset > 0) { if (debug) { Console.WriteLine("seeking to " + offset); } long npos = output.Seek(offset, SeekOrigin.Begin); Console.WriteLine("new pos=" + npos); } } sendCommand("RETR " + remFileName); if (!(retValue == 150 || retValue == 125)) { throw new IOException(reply.Substring(4)); } while (true) { bytes = cSocket.Receive(buffer, buffer.Length, 0); output.Write(buffer, 0, bytes); if (bytes <= 0) { break; } } output.Close(); if (cSocket.Connected) { cSocket.Close(); } Console.WriteLine(""); readReply(); if (!(retValue == 226 || retValue == 250)) { throw new IOException(reply.Substring(4)); } } /// /// Upload a file. /// /// public void upload(string fileName) { upload(fileName, false); } /// /// Upload a file and set the resume flag. /// /// /// public void upload(string fileName, Boolean resume) { if (!logined) { login(); } Socket cSocket = createDataSocket(); long offset = 0; if (resume) { try { setBinaryMode(true); offset = getFileSize(fileName); } catch (Exception) { offset = 0; } } if (offset > 0) { sendCommand("REST " + offset); if (retValue != 350) { //throw new IOException(reply.Substring(4)); //Remote server may not support resuming. offset = 0; } } sendCommand("STOR " + Path.GetFileName(fileName)); if (!(retValue == 125 || retValue == 150)) { throw new IOException(reply.Substring(4)); } // open input stream to read source file FileStream input = new FileStream(fileName, FileMode.Open); if (offset != 0) { if (debug) { Console.WriteLine("seeking to " + offset); } input.Seek(offset, SeekOrigin.Begin); } Console.WriteLine("Uploading file " + fileName + " to " + remotePath); while ((bytes = input.Read(buffer, 0, buffer.Length)) > 0) { cSocket.Send(buffer, bytes, 0); } input.Close(); Console.WriteLine(""); if (cSocket.Connected) { cSocket.Close(); } readReply(); if (!(retValue == 226 || retValue == 250)) { throw new IOException(reply.Substring(4)); } } /// /// Delete a file from the remote FTP server. /// /// public void deleteRemoteFile(string fileName) { if (!logined) { login(); } sendCommand("DELE " + fileName); if (retValue != 250) { throw new IOException(reply.Substring(4)); } } /// /// Rename a file on the remote FTP server. /// /// /// public void renameRemoteFile(string oldFileName, string newFileName) { if (!logined) { login(); } sendCommand("RNFR " + oldFileName); if (retValue != 350) { throw new IOException(reply.Substring(4)); } // known problem // rnto will not take care of existing file. // i.e. It will overwrite if newFileName exist sendCommand("RNTO " + newFileName); if (retValue != 250) { throw new IOException(reply.Substring(4)); } } /// /// Create a directory on the remote FTP server. /// /// public void mkdir(string dirName) { if (!logined) { login(); } sendCommand("MKD " + dirName); if (retValue != 250) { throw new IOException(reply.Substring(4)); } } /// /// Delete a directory on the remote FTP server. /// /// public void rmdir(string dirName) { if (!logined) { login(); } sendCommand("RMD " + dirName); if (retValue != 250) { throw new IOException(reply.Substring(4)); } } /// /// Change the current working directory on the remote FTP server. /// /// public void chdir(string dirName) { if (dirName.Equals(".")) { return; } if (!logined) { login(); } sendCommand("CWD " + dirName); if (retValue != 250) { throw new IOException(reply.Substring(4)); } this.remotePath = dirName; Console.WriteLine("Current directory is " + remotePath); } /// /// Close the FTP connection. /// public void close() { if (clientSocket != null) { sendCommand("QUIT"); } cleanup(); Console.WriteLine("Closing..."); } /// /// Set debug mode. /// /// public void setDebug(Boolean debug) { this.debug = debug; } private void readReply() { mes = ""; reply = readLine(); retValue = Int32.Parse(reply.Substring(0, 3)); } private void cleanup() { if (clientSocket != null) { clientSocket.Close(); clientSocket = null; } logined = false; } private string readLine() { while (true) { bytes = clientSocket.Receive(buffer, buffer.Length, 0); mes += ASCII.GetString(buffer, 0, bytes); if (bytes < buffer.Length) { break; } } char[] seperator = { ' ' }; string[] mess = mes.Split(seperator); if (mes.Length > 2) { mes = mess[mess.Length - 2]; } else { mes = mess[0]; } if (!mes.Substring(3, 1).Equals(" ")) { return readLine(); } if (debug) { for (int k = 0; k < mess.Length - 1; k++) { Console.WriteLine(mess[k]); } } return mes; } private void sendCommand(String command) { Byte[] cmdBytes = Encoding.ASCII.GetBytes((command + " ").ToCharArray()); clientSocket.Send(cmdBytes, cmdBytes.Length, 0); readReply(); } private Socket createDataSocket() { sendCommand("PASV"); if (retValue != 227) { throw new IOException(reply.Substring(4)); } int index1 = reply.IndexOf('('); int index2 = reply.IndexOf(')'); string ipData = reply.Substring(index1 + 1, index2 - index1 - 1); int[] parts = new int[6]; int len = ipData.Length; int partCount = 0; string buf = ""; for (int i = 0; i < len && partCount <= 6; i++) { char ch = Char.Parse(ipData.Substring(i, 1)); if (Char.IsDigit(ch)) buf += ch; else if (ch != ',') { throw new IOException("Malformed PASV reply: " + reply); } if (ch == ',' || i + 1 == len) { try { parts[partCount++] = Int32.Parse(buf); buf = ""; } catch (Exception) { throw new IOException("Malformed PASV reply: " + reply); } } } string ipAddress = parts[0] + "." + parts[1] + "." + parts[2] + "." + parts[3]; int port = (parts[4] << 8) + parts[5]; Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPEndPoint ep = new IPEndPoint(Dns.Resolve(ipAddress).AddressList[0], port); try { s.Connect(ep); } catch (Exception) { throw new IOException("Can't connect to remote server"); } return s; } }}

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