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C#通过FTP账号上传、修改、删除文件 FTPClient
下面类文件中，主要做的工作是：从ftp服务器上下载文件把本地文件替换、添加、或删除功能，在替换本地文件时会先备份一下本地的文件，若整个操作都完成了就会发出commit命令，表示全部替换成功。若中间操作有失败的，则把本地文件回滚到替换前的样子。
描述：
SynchroDataTest.cs（Winform页面类）中的addfiles数组代表要下载到本地的文件（有可能是添加或替换），delfiles数组是要把本地的这些文件删除的数组
string[] addfiles = new string[] { "/SnmpWalk/ReadMe.txt", "/SnmpWalk/SnmpWalk.exe", "/IPMI/WMI取CPU使用率等/net中的WMI编程.docx", "/IPMI/dell IPMI V2 工作原理.docx" };string[] delfiles = new string[] { "/IPMI/使用IPMI远程控制管理DELL2850服务器.docx", "/IPMI/使用 ipmitool 实现 Linux 系统下对服务器的 ipmi 管理.docx", "/IPMI/使用 ipmit/没有此文件.jpg" };
using System;using System.Text;using System.IO;using System.Net;using System.Net.Sockets;namespace EricTestProject{ 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socket Socket socketData = http://www.mamicode.com/CreateDataSocket();"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 += Utf8Coding.GetString(buffer, 0, iBytes); if (iBytes < buffer.Length) { break; } } //char[] seperator = { ‘\n‘ }; string[] strsFileList = strMsg.Split(new string[] { "\r\n" }, 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(); } //如果下载文件夹中已有此文件，则删除此文件在创建 if (File.Exists(strFolder + "\\" + strLocalFileName)) { File.Delete(strFolder + "\\" + strLocalFileName); } FileStream output = new FileStream(strFolder + "\\" + strLocalFileName, FileMode.Create); Socket socketData = http://www.mamicode.com/CreateDataSocket();"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 = http://www.mamicode.com/CreateDataSocket();"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 Utf8Coding = Encoding.UTF8; //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 = http://www.mamicode.com/strReply.Substring(index1 + 1, index2 - index1 - 1);""; 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 += Utf8Coding.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 = Utf8Coding.GetBytes((strCommand + "\r\n").ToCharArray()); socketControl.Send(cmdBytes, cmdBytes.Length, 0); ReadReply(); } #endregion }}
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