FTPClient
FTPClient
public class FTPClient
{
构造函数#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 ) { strRemoteHost = remoteHost; strRemotePath = remotePath; strRemoteUser = remoteUser; strRemotePass = remotePass; strRemotePort = remotePort; Connect(); } #endregion 登陆#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 链接#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 传输模式#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 文件操作#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; } /**//// <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 上传和下载#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(strFolder + "\\" +strLocalFileName)) { Stream st = File.Create(strFolder + "\\" +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 目录操作#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 内部变量#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 内部函数#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
} 
