C#操作FTP的类，Socket实现，网上找到的，整理了一下，处理了一些BUG，喜欢的拿去用，但不保证全部BUG已捉完。
using System;
using System.Net;
using System.IO;
using System.Text;
using System.Net.Sockets;namespace XML自动回执工具
{/// <summary>/// FTPClient 的摘要说明。/// </summary>/// <summary>/// FTPClient 的摘要说明。/// </summary>public class FTPClient{#region 构造函数/// <summary>/// 缺省构造函数/// </summary>public FTPClient(){strRemoteHost = "";strRemotePath = "/";strRemoteUser = "";strRemotePass = "";strRemotePort = 21;bConnected = false;} /// <summary>/// 构造函数/// </summary>/// <param name="remoteHost"></param>/// <param name="remotePath"></param>/// <param name="remoteUser"></param>/// <param name="remotePass"></param>/// <param name="remotePort"></param>public FTPClient(string remoteHost, string remotePath, string remoteUser, string remotePass, int remotePort){strRemoteHost = remoteHost;strRemotePath = remotePath;strRemoteUser = remoteUser;strRemotePass = remotePass;strRemotePort = remotePort;Connect();}#endregion#region 登陆/// <summary>/// FTP服务器IP地址/// </summary>private string strRemoteHost;public string RemoteHost{get{return strRemoteHost;}set{strRemoteHost = value;}}/// <summary>/// FTP服务器端口/// </summary>private int strRemotePort;public int RemotePort{get{return strRemotePort;}set{strRemotePort = value;}}/// <summary>/// 当前服务器目录/// </summary>private string strRemotePath;public string RemotePath{get{return strRemotePath;}set{strRemotePath = value;}}/// <summary>/// 登录用户账号/// </summary>private string strRemoteUser;public string RemoteUser{set{strRemoteUser = value;}}/// <summary>/// 用户登录密码/// </summary>private string strRemotePass;public string RemotePass{set{strRemotePass = value;}} /// <summary>/// 是否登录/// </summary>private Boolean bConnected;public bool Connected{get{return bConnected;}}#endregion#region 链接/// <summary>/// 建立连接 /// </summary>public void Connect(){socketControl = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);IPEndPoint ep = new IPEndPoint(IPAddress.Parse(RemoteHost), strRemotePort);// 链接try{socketControl.Connect(ep);}catch (Exception){throw new IOException("Couldn't connect to remote server");} // 获取应答码ReadReply();if (iReplyCode != 220){DisConnect();throw new IOException(strReply.Substring(4));} // 登陆SendCommand("USER " + strRemoteUser);if (!(iReplyCode == 331 || iReplyCode == 230)){CloseSocketConnect();//关闭连接throw new IOException(strReply.Substring(4));}if (iReplyCode != 230){SendCommand("PASS " + strRemotePass);if (!(iReplyCode == 230 || iReplyCode == 202)){CloseSocketConnect();//关闭连接throw new IOException(strReply.Substring(4));}}bConnected = true; // 切换到目录ChDir(strRemotePath);}/// <summary>/// 关闭连接/// </summary>public void DisConnect(){if (socketControl != null){SendCommand("QUIT");}CloseSocketConnect();}#endregion#region 传输模式 /// <summary>/// 传输模式:二进制类型、ASCII类型/// </summary>public enum TransferType { Binary, ASCII }; /// <summary>/// 设置传输模式/// </summary>/// <param name="ttType">传输模式</param>public void SetTransferType(TransferType ttType){if (ttType == TransferType.Binary){SendCommand("TYPE I");//binary类型传输}else{SendCommand("TYPE A");//ASCII类型传输}if (iReplyCode != 200){throw new IOException(strReply.Substring(4));}else{trType = ttType;}}/// <summary>/// 获得传输模式/// </summary>/// <returns>传输模式</returns>public TransferType GetTransferType(){return trType;}#endregion#region 文件操作/// <summary>/// 获得文件列表/// </summary>/// <param name="strMask">文件名的匹配字符串</param>/// <returns></returns>public string[] Dir(string strMask){// 建立链接if (!bConnected){Connect();} //建立进行数据连接的socketSocket socketData = CreateDataSocket();//传送命令SendCommand("NLST " + strMask); //分析应答代码if (!(iReplyCode == 150 || iReplyCode == 125 || iReplyCode == 226)){throw new IOException(strReply.Substring(4));} //获得结果strMsg = "";while (true){int iBytes = socketData.Receive(buffer, buffer.Length, 0);strMsg += ASCII.GetString(buffer, 0, iBytes);if (iBytes < buffer.Length){break;}}//char[] seperator = { '\n' };string[] seperator = { "\r\n" };string[] strsFileList = strMsg.Split(seperator, StringSplitOptions.RemoveEmptyEntries);socketData.Close();//数据socket关闭时也会有返回码if (iReplyCode != 226){ReadReply();if (iReplyCode != 226){throw new IOException(strReply.Substring(4));}}return strsFileList;}/// <summary>/// 获取文件大小/// </summary>/// <param name="strFileName">文件名</param>/// <returns>文件大小</returns>private long GetFileSize(string strFileName){if (!bConnected){Connect();}SendCommand("SIZE " + Path.GetFileName(strFileName));long lSize = 0;if (iReplyCode == 213){lSize = Int64.Parse(strReply.Substring(4));}else{throw new IOException(strReply.Substring(4));}return lSize;}/// <summary>/// 删除/// </summary>/// <param name="strFileName">待删除文件名</param>public void Delete(string strFileName){if (!bConnected){Connect();}SendCommand("DELE " + strFileName);if (iReplyCode != 250){throw new IOException(strReply.Substring(4));}}/// <summary>/// 重命名(如果新文件名与已有文件重名,将覆盖已有文件)/// </summary>/// <param name="strOldFileName">旧文件名</param>/// <param name="strNewFileName">新文件名</param>public void Rename(string strOldFileName, string strNewFileName){if (!bConnected){Connect();}SendCommand("RNFR " + strOldFileName);if (iReplyCode != 350){throw new IOException(strReply.Substring(4));}// 如果新文件名与原有文件重名,将覆盖原有文件SendCommand("RNTO " + strNewFileName);if (iReplyCode != 250){throw new IOException(strReply.Substring(4));}}#endregion#region 上传和下载/// <summary>/// 下载一批文件/// </summary>/// <param name="strFileNameMask">文件名的匹配字符串</param>/// <param name="strFolder">本地目录(不得以/结束)</param>public void Get(string strFileNameMask, string strFolder){if (!bConnected){Connect();}string[] strFiles = Dir(strFileNameMask);foreach (string strFile in strFiles){if (!strFile.Equals(""))//一般来说strFiles的最后一个元素可能是空字符串{Get(strFile, strFolder, strFile);}}}/// <summary>/// 下载一个文件/// </summary>/// <param name="strRemoteFileName">要下载的文件名</param>/// <param name="strFolder">本地目录(不得以/结束)</param>/// <param name="strLocalFileName">保存在本地时的文件名</param>public void Get(string strRemoteFileName, string strFolder, string strLocalFileName){if (!bConnected){Connect();}SetTransferType(TransferType.Binary);if (strLocalFileName.Equals("")){strLocalFileName = strRemoteFileName;}//if (!File.Exists(strLocalFileName))//{
// Stream st = File.Create(strLocalFileName);// st.Close();//}FileStream output = new FileStream(strFolder + "\\" + strLocalFileName, FileMode.Create);Socket socketData = CreateDataSocket();SendCommand("RETR " + strRemoteFileName);if (!(iReplyCode == 150 || iReplyCode == 125 || iReplyCode == 226 || iReplyCode == 250)){throw new IOException(strReply.Substring(4));}while (true){int iBytes = socketData.Receive(buffer, buffer.Length, 0);output.Write(buffer, 0, iBytes);if (iBytes <= 0){break;}}output.Close();if (socketData.Connected){socketData.Close();}if (!(iReplyCode == 226 || iReplyCode == 250)){ReadReply();if (!(iReplyCode == 226 || iReplyCode == 250)){throw new IOException(strReply.Substring(4));}}}/// <summary>/// 上传一批文件/// </summary>/// <param name="strFolder">本地目录(不得以/结束)</param>/// <param name="strFileNameMask">文件名匹配字符(可以包含*和?)</param>public void Put(string strFolder, string strFileNameMask){string[] strFiles = Directory.GetFiles(strFolder, strFileNameMask);foreach (string strFile in strFiles){//strFile是完整的文件名(包含路径)Put(strFile);}}/// <summary>/// 上传一个文件/// </summary>/// <param name="strFileName">本地文件名</param>public void Put(string strFileName){if (!bConnected){Connect();}Socket socketData = CreateDataSocket();SendCommand("STOR " + Path.GetFileName(strFileName));if (!(iReplyCode == 125 || iReplyCode == 150)){throw new IOException(strReply.Substring(4));}FileStream input = new FileStream(strFileName, FileMode.Open);int iBytes = 0;while ((iBytes = input.Read(buffer, 0, buffer.Length)) > 0){socketData.Send(buffer, iBytes, 0);}input.Close();if (socketData.Connected){socketData.Close();}if (!(iReplyCode == 226 || iReplyCode == 250)){ReadReply();if (!(iReplyCode == 226 || iReplyCode == 250)){throw new IOException(strReply.Substring(4));}}}#endregion#region 目录操作/// <summary>/// 创建目录/// </summary>/// <param name="strDirName">目录名</param>public void MkDir(string strDirName){if (!bConnected){Connect();}SendCommand("MKD " + strDirName);if (iReplyCode != 257){throw new IOException(strReply.Substring(4));}}/// <summary>/// 删除目录/// </summary>/// <param name="strDirName">目录名</param>public void RmDir(string strDirName){if (!bConnected){Connect();}SendCommand("RMD " + strDirName);if (iReplyCode != 250){throw new IOException(strReply.Substring(4));}}/// <summary>/// 改变目录/// </summary>/// <param name="strDirName">新的工作目录名</param>public void ChDir(string strDirName){if (strDirName.Equals(".") || strDirName.Equals("")){return;}if (!bConnected){Connect();}SendCommand("CWD " + strDirName);if (iReplyCode != 250){throw new IOException(strReply.Substring(4));}this.strRemotePath = strDirName;}#endregion#region 内部变量/// <summary>/// 服务器返回的应答信息(包含应答码)/// </summary>private string strMsg;/// <summary>/// 服务器返回的应答信息(包含应答码)/// </summary>private string strReply;/// <summary>/// 服务器返回的应答码/// </summary>private int iReplyCode;/// <summary>/// 进行控制连接的socket/// </summary>private Socket socketControl;/// <summary>/// 传输模式/// </summary>private TransferType trType;/// <summary>/// 接收和发送数据的缓冲区/// </summary>private static int BLOCK_SIZE = 512;Byte[] buffer = new Byte[BLOCK_SIZE];/// <summary>/// 编码方式/// </summary>Encoding ASCII = Encoding.ASCII;#endregion#region 内部函数/// <summary>/// 将一行应答字符串记录在strReply和strMsg/// 应答码记录在iReplyCode/// </summary>private void ReadReply(){strMsg = "";strReply = ReadLine();iReplyCode = Int32.Parse(strReply.Substring(0, 3));} /// <summary>/// 建立进行数据连接的socket/// </summary>/// <returns>数据连接socket</returns>private Socket CreateDataSocket(){SendCommand("PASV");if (iReplyCode != 227){throw new IOException(strReply.Substring(4));}int index1 = strReply.IndexOf('(');int index2 = strReply.IndexOf(')');string ipData =strReply.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 strReply: " + strReply);}if (ch == ',' || i + 1 == len){try{parts[partCount++] = Int32.Parse(buf);buf = "";}catch (Exception){throw new IOException("Malformed PASV strReply: " + strReply);}}}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(IPAddress.Parse(ipAddress), port);try{s.Connect(ep);}catch (Exception){throw new IOException("Can't connect to remote server");}return s;}/// <summary>/// 关闭socket连接(用于登录以前)/// </summary>private void CloseSocketConnect(){if (socketControl != null){socketControl.Close();socketControl = null;}bConnected = false;}/// <summary>/// 读取Socket返回的所有字符串/// </summary>/// <returns>包含应答码的字符串行</returns>private string ReadLine(){while (true){int iBytes = socketControl.Receive(buffer, buffer.Length, 0);strMsg += ASCII.GetString(buffer, 0, iBytes);if (iBytes < buffer.Length){break;}}char[] seperator = { '\n' };string[] mess = strMsg.Split(seperator);if (strMsg.Length > 2){strMsg = mess[mess.Length - 2];//seperator[0]是10,换行符是由13和0组成的,分隔后10后面虽没有字符串,//但也会分配为空字符串给后面(也是最后一个)字符串数组,//所以最后一个mess是没用的空字符串//但为什么不直接取mess[0],因为只有最后一行字符串应答码与信息之间有空格}else{strMsg = mess[0];}if (!strMsg.Substring(3, 1).Equals(" "))//返回字符串正确的是以应答码(如220开头,后面接一空格,再接问候字符串){return ReadLine();}return strMsg;}/// <summary>/// 发送命令并获取应答码和最后一行应答字符串/// </summary>/// <param name="strCommand">命令</param>private void SendCommand(String strCommand){Byte[] cmdBytes = Encoding.ASCII.GetBytes((strCommand + "\r\n").ToCharArray());socketControl.Send(cmdBytes, cmdBytes.Length, 0);ReadReply();}#endregion}
}