using System;using System.Net;using System.IO;using System.Text;using System.Net.Sockets;////// FTPClient 的摘要说明。/// public class FTPClient{ #region 构造函数////// 缺省构造函数/// public FTPClient(){ strRemoteHost = ""; strRemotePath = ""; strRemoteUser = ""; strRemotePass = ""; strRemotePort = 21; bConnected = false;} ////// 构造函数/// /// /// /// /// /// 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////// FTP服务器IP地址/// private string strRemoteHost;public string RemoteHost{ get { return strRemoteHost; } set { strRemoteHost = value; }}////// FTP服务器端口/// private int strRemotePort;public int RemotePort{ get { return strRemotePort; } set { strRemotePort = value; }}////// 当前服务器目录/// private string strRemotePath;public string RemotePath{ get { return strRemotePath; } set { strRemotePath = value; }}////// 登录用户账号/// private string strRemoteUser;public string RemoteUser{ set { strRemoteUser = value; }}////// 用户登录密码/// private string strRemotePass;public string RemotePass{ set { strRemotePass = value; }} ////// 是否登录/// private Boolean bConnected;public bool Connected{ get { return bConnected; }}#endregion #region 链接////// 建立连接 /// 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);} ////// 关闭连接/// public void DisConnect(){ if( socketControl != null ) { SendCommand("QUIT"); } CloseSocketConnect();} #endregion #region 传输模式 ////// 传输模式:二进制类型、ASCII类型/// public enum TransferType {Binary,ASCII}; ////// 设置传输模式/// /// 传输模式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; }}////// 获得传输模式/// ///传输模式 public TransferType GetTransferType(){ return trType;} #endregion #region 文件操作////// 获得文件列表/// /// 文件名的匹配字符串///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); //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[] 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;} /// /// 获取文件大小/// /// 文件名///文件大小 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;}////// 删除/// /// 待删除文件名public void Delete(string strFileName){ if(!bConnected) { Connect(); } SendCommand("DELE "+strFileName); if(iReplyCode != 250) { throw new IOException(strReply.Substring(4)); }} ////// 重命名(如果新文件名与已有文件重名,将覆盖已有文件)/// /// 旧文件名/// 新文件名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////// 下载一批文件/// /// 文件名的匹配字符串/// 本地目录(不得以/结束)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); } }} ////// 下载一个文件/// /// 要下载的文件名/// 本地目录(不得以/结束)/// 保存在本地时的文件名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)); } }} ////// 上传一批文件/// /// 本地目录(不得以/结束)/// 文件名匹配字符(可以包含*和?)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); }} ////// 上传一个文件/// /// 本地文件名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////// 创建目录/// /// 目录名public void MkDir(string strDirName){ if(!bConnected) { Connect(); } SendCommand("MKD "+strDirName); if(iReplyCode != 257) { throw new IOException(strReply.Substring(4)); }} ////// 删除目录/// /// 目录名public void RmDir(string strDirName){ if(!bConnected) { Connect(); } SendCommand("RMD "+strDirName); if(iReplyCode != 250) { throw new IOException(strReply.Substring(4)); }} ////// 改变目录/// /// 新的工作目录名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////// 服务器返回的应答信息(包含应答码)/// private string strMsg;////// 服务器返回的应答信息(包含应答码)/// private string strReply;////// 服务器返回的应答码/// private int iReplyCode;////// 进行控制连接的socket/// private Socket socketControl;////// 传输模式/// private TransferType trType;////// 接收和发送数据的缓冲区/// private static int BLOCK_SIZE = 512;Byte[] buffer = new Byte[BLOCK_SIZE];////// 编码方式/// Encoding ASCII = Encoding.ASCII;#endregion #region 内部函数////// 将一行应答字符串记录在strReply和strMsg/// 应答码记录在iReplyCode/// private void ReadReply(){ strMsg = ""; strReply = ReadLine(); iReplyCode = Int32.Parse(strReply.Substring(0,3));} ////// 建立进行数据连接的socket/// ///数据连接socket 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;}////// 关闭socket连接(用于登录以前)/// private void CloseSocketConnect(){ if(socketControl!=null) { socketControl.Close(); socketControl = null; } bConnected = false;}////// 读取Socket返回的所有字符串/// ///包含应答码的字符串行 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;}////// 发送命令并获取应答码和最后一行应答字符串/// /// 命令private void SendCommand(String strCommand){ //Byte[] cmdBytes = // Encoding.ASCII.GetBytes((strCommand + "/r/n").ToCharArray()); byte[] cmdBytes = Encoding.GetEncoding("gb2312").GetBytes((strCommand + "/r/n").ToCharArray()); socketControl.Send(cmdBytes, cmdBytes.Length, 0); ReadReply();} #endregion }