public delegate void DownloadProgressChangedEventHandle(string information, long currentprogress, long totalprogress, string filename); public delegate void DownloadFileCompletedEventHandle(string information, bool success, string filename); public delegate void UploadProgressChangedEventHandle(string information, long currentprogress, long totalprogress, string filename); public delegate void UploadFileCompletedEventHandle(string information, bool success, string filename); /// <summary> /// FTP 的摘要说明。 /// </summary> public class FTPClient { private string strRemoteHost; private int strRemotePort; private string strRemotePath; private string strRemoteUser; private string strRemotePass; private Boolean bConnected; public event DownloadProgressChangedEventHandle DownloadProgressChanged; public event DownloadFileCompletedEventHandle DownloadFileCompleted; public event UploadProgressChangedEventHandle UploadProgressChanged; public event UploadFileCompletedEventHandle UploadFileCompleted; #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> /// 传输模式:二进制类型、ASCII类型 /// </summary> public enum TransferType { /// <summary> /// Binary /// </summary> Binary, /// <summary> /// ASCII /// </summary> ASCII }; /// <summary> /// 接收和发送数据的缓冲区 /// </summary> private static int BLOCK_SIZE = 1024; Byte[] buffer = new Byte[BLOCK_SIZE]; /// <summary> /// 编码方式 /// </summary> Encoding ASCII = Encoding.Default; private AsyncOperation asyncOperation; #endregion #region 内部函数 #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) { IPAddress[] ips; ips = Dns.GetHostAddresses(remoteHost); strRemoteHost = ips[0].ToString(); strRemotePath = remotePath; strRemoteUser = remoteUser; strRemotePass = remotePass; strRemotePort = remotePort; Connect(); } #endregion #region 登陆 /// <summary> /// FTP服务器IP地址 /// </summary> public string RemoteHost { get { return strRemoteHost; } set { strRemoteHost = value; } } /// <summary> /// FTP服务器端口 /// </summary> public int RemotePort { get { return strRemotePort; } set { strRemotePort = value; } } /// <summary> /// 当前服务器目录 /// </summary> public string RemotePath { get { return strRemotePath; } set { strRemotePath = value; } } /// <summary> /// 登录用户账号 /// </summary> public string RemoteUser { set { strRemoteUser = value; } } /// <summary> /// 用户登录密码 /// </summary> public string RemotePass { set { strRemotePass = value; } } /// <summary> /// 是否登录 /// </summary> 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> /// 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< eturns> 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>< eturns> public string[] Dir(string strMask) { // 建立链接 if (!bConnected) { Connect(); } //建立进行数据连接的socket Socket socketData = CreateDataSocket(); //传送命令 SendCommand("NLST " + strMask); if (iReplyCode == 550) { Put(strMask); 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; } } strMsg = strMsg.Replace(' ', ' '); char[] seperator = { ' ' }; 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< eturns> public 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> /// 下载多个文件 /// </summary> /// <param name="strFileNameMask">文件名的匹配字符串</param> /// <param name="strLocalFolder">本地目录(不得以/结束)</param> public void Get(string strFileNameMask, string strLocalFolder) { 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, strLocalFolder, strFile); } } } /// <summary> /// 下载单个文件 /// </summary> /// <param name="strRemoteFileName">要下载的文件名</param> /// <param name="strLocalFolder">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 strLocalFolder, string strLocalFileName) { if (!bConnected) { Connect(); } SetTransferType(TransferType.Binary); if (strLocalFileName.Equals("")) { strLocalFileName = strRemoteFileName; } if (!File.Exists(strLocalFileName)) { Stream st = File.Create(strLocalFileName); st.Close(); } long fileSize = this.GetFileSize(strRemoteFileName);//mlh 获取文件总大小 FileStream output = new FileStream(strLocalFolder + "//" + strLocalFileName, FileMode.Create); Socket socketData = CreateDataSocket(); SendCommand("RETR " + strRemoteFileName); if (!(iReplyCode == 150 || iReplyCode == 125 || iReplyCode == 226 || iReplyCode == 250)) { throw new IOException(strReply.Substring(4)); } long num = 0; //mlh 记录总的上传大小 while (true) { int iBytes = socketData.Receive(buffer, buffer.Length, 0); output.Write(buffer, 0, iBytes); num += iBytes; if (DownloadProgressChanged != null) { if (asyncOperation != null) { asyncOperation.Post((object data) => { DownloadProgressChanged("", num, fileSize, strRemoteFileName); }, null); } else DownloadProgressChanged("", num, fileSize, strRemoteFileName); } 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)); } } if (asyncOperation != null) { asyncOperation.Post((object data) => { DownloadFileCompleted("", true, strRemoteFileName); }, null); } else DownloadFileCompleted("", true, strRemoteFileName); } /// <summary> /// 异步下载多个文件 /// </summary> /// <param name="strFileNameMask"></param> /// <param name="strLocalFolder"></param> public void GetAsync(string strFileNameMask, string strLocalFolder) { asyncOperation = AsyncOperationManager.CreateOperation(null); Thread threadGet = new Thread(new ThreadStart(() => { Get(strFileNameMask, strLocalFolder); })); threadGet.IsBackground = true; threadGet.Start(); } /// <summary> /// 异步下载单个文件 /// </summary> /// <param name="strFileNameMask"></param> /// <param name="strLocalFolder"></param> /// <param name="strLocalFileName"></param> public void GetAsync(string strFileNameMask, string strLocalFolder, string strLocalFileName) { asyncOperation = AsyncOperationManager.CreateOperation(null); Thread threadGet = new Thread(new ThreadStart(() => { Get(strFileNameMask, strLocalFolder, strLocalFileName); })); threadGet.IsBackground = true; threadGet.Start(); } /// <summary> /// 上传多个文件 /// </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); long num = 0;//mlh 当前上传大小 long fileSize = input.Length;//mlh 文件总大小 int iBytes = 0; while ((iBytes = input.Read(buffer, 0, buffer.Length)) > 0) { num += iBytes; if (UploadProgressChanged != null) UploadProgressChanged("", num, fileSize, strFileName); 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)); } } if (UploadFileCompleted != null) UploadFileCompleted("", true, strFileName); } /// <summary> /// 异步上传多个文件 /// </summary> /// <param name="strFolder"></param> /// <param name="strFileNameMask"></param> public void PutAsync(string strFolder, string strFileNameMask) { asyncOperation = AsyncOperationManager.CreateOperation(null); Thread threadGet = new Thread(new ThreadStart(() => { Put(strFolder, strFileNameMask); })); threadGet.IsBackground = true; threadGet.Start(); } /// <summary> /// 异步上传多个文件 /// </summary> /// <param name="strFileName"></param> public void PutAsync(string strFileName) { asyncOperation = AsyncOperationManager.CreateOperation(null); Thread threadGet = new Thread(new ThreadStart(() => { Put(strFileName); })); threadGet.IsBackground = true; threadGet.Start(); } #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; } /// <summary> /// 列目录 /// </summary> /// <param name="strDirName"></param> public string[] ListDir() { if (!bConnected) { Connect(); } //建立进行数据连接的socket Socket socketData = CreateDataSocket(); SendCommand("LIST"); if (iReplyCode != 150) { 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; } } strMsg = strMsg.Replace(' ', ' '); char[] seperator = { ' ' }; string[] strsFileList = strMsg.Split(seperator); 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; } #endregion /// <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< eturns> 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< eturns> 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 = new char[] { ' ' }; 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 = ASCII.GetBytes((strCommand + " ").ToCharArray()); socketControl.Send(cmdBytes, cmdBytes.Length, 0); ReadReply(); } #endregion }
ps：在实际使用过程中发现由于BLOCK_SIZE设置太小导致DownloadProgressChanged事件触发过于频繁，结果界面会卡顿，所以具体多少可以自己调试设置