.NET中完成FTP各功能操作

1.FTP工厂类

using System;
using System.Configuration;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;

namespace School.Common
{
    /**//// <summary>
    /// 类 编 号： 0043
    /// 类 名 称： FTPFactory 
    /// 内容摘要： FTP工厂，完成FTP各功能操作
    /// 完成日期： 2007-1-12 10:38:36
    /// 编码作者： 林付国
    /// </summary>
    public class FTPFactory
    {
        成员变量#region 成员变量

        //static readonly log4net.ILog log = log4net.LogManager.GetLogger("log4net");
        private string remoteHost, remotePath, remoteUser, remotePass, mes;
        private int remotePort = 21, bytes;
        private Socket clientSocket;
        private int retValue;
        private Boolean debug;
        private Boolean logined;
        private string reply;

        private static int BLOCK_SIZE = 512;
        private Byte[] buffer = new Byte[BLOCK_SIZE];
        private Encoding ASCII = Encoding.ASCII;
        // FTP当前处理信息事件
        public event FTPProcessInfoEventHandler SetProcessInfoEvent;
        #endregion

        构造方法#region 构造方法

        public FTPFactory()
        {
            //string FTPRemoteIP = ConfigurationSettings.AppSettings["FTPRemoteIP"];
            //int FTPRemotePort = Convert.ToInt32(ConfigurationSettings.AppSettings["FTPRemotePort"]);
            //string FTPUser = ConfigurationSettings.AppSettings["FTPUser"];
            //string FTPPassword = ConfigurationSettings.AppSettings["FTPPassword"];

            //remoteHost = FTPRemoteIP;
            remotePath = ".";
            //remoteUser = FTPUser;
            //remotePass = FTPPassword;
            //remotePort = FTPRemotePort;

            debug = false;
            logined = false;
        }

        #endregion

        基本信息设置#region 基本信息设置

        /**////
        /// Set the name of the FTP server to connect to.
        ///
        /// Server name
        public void setRemoteHost(string remoteHost)
        {
            this.remoteHost = remoteHost;
        }

        /**////
        /// Return the name of the current FTP server.
        ///
        /// Server name
        public string getRemoteHost()
        {
            return remoteHost;
        }

        /**////
        /// Set the port number to use for FTP.
        ///
        /// Port number
        public void setRemotePort(int remotePort)
        {
            this.remotePort = remotePort;
        }

        /**////
        /// Return the current port number.
        ///
        /// Current port number
        public int getRemotePort()
        {
            return remotePort;
        }

        /**////
        /// Set the remote directory path.
        ///
        /// The remote directory path
        public void setRemotePath(string remotePath)
        {
            this.remotePath = remotePath;
        }

        /**////
        /// Return the current remote directory path.
        ///
        /// The current remote directory path.
        public string getRemotePath()
        {
            return remotePath;
        }

        /**////
        /// Set the user name to use for logging into the remote server.
        ///
        /// Username
        public void setRemoteUser(string remoteUser)
        {
            this.remoteUser = remoteUser;
        }

        /**////
        /// Set the password to user for logging into the remote server.
        ///
        /// Password
        public void setRemotePass(string remotePass)
        {
            this.remotePass = remotePass;
        }

        #endregion

        属性#region 属性
        /**//// <summary>
        /// 是否登录成功
        /// </summary>
        public bool GetLogin
        {
            get
            {
                return this.logined;
            }
        }

        #endregion

        功能操作#region 功能操作

        /**////
        /// Return a string array containing the remote directory's file list.
        ///
        ///
        ///
        public string[] getFileList(string mask)
        {
            if (!logined)
            {
                login();
            }

            Socket cSocket = createDataSocket();

            sendCommand("NLST " + mask);

            if (!(retValue == 150 || retValue == 125))
            {
                throw new IOException(reply.Substring(4));
            }

            mes = "";
            Thread.Sleep(700);

            while (true)
            {
                if (cSocket.Connected)
                {
                    int bytes = cSocket.Receive(buffer, buffer.Length, 0);
                    mes += ASCII.GetString(buffer, 0, bytes);
                    if (bytes < buffer.Length)
                    {
                        break;
                    }
                }
                else
                {
                    this.SetProcessInfoText("socket 连接已断！");
                    //log.Info("socket 连接断了！");
                }

            }
            //log.Info(mes);
            char[] seperator = { '\n' };
            string[] mess = mes.Split(seperator);
            //foreach(string fileName in mess)
            //{
            //log.Info(fileName);
            //}

            cSocket.Close();
            readReply();

            if (retValue != 226)
            {
                throw new IOException(reply.Substring(4));
            }
            return mess;
        }

        public string[] getFileList()
        {
            if (!logined)
            {
                login();
            }

            Socket cSocket = createDataSocket();

            sendCommand("LIST ");

            if (!(retValue == 150 || retValue == 125))
            {
                throw new IOException(reply.Substring(4));
            }

            mes = "";

            while (true)
            {
                int bytes = cSocket.Receive(buffer, buffer.Length, 0);
                mes += ASCII.GetString(buffer, 0, bytes);

                if (bytes < buffer.Length)
                {
                    break;
                }
            }

            //log.Info(mes);
            char[] seperator = { '\n' };
            string[] mess = mes.Split(seperator);
            cSocket.Close();

            readReply();

            if (retValue != 226)
            {
                throw new IOException(reply.Substring(4));
            }

            return mess;
        }

        /**////
        /// Return the size of a file.
        ///
        ///
        ///
        public long getFileSize(string fileName)
        {
            if (!logined)
            {
                login();
            }

            sendCommand("SIZE " + fileName);

            long size = 0;

            if (retValue == 213)
            {
                size = Int64.Parse(reply.Substring(4));
            }
            else
            {
                throw new IOException(reply.Substring(4));
            }

            return size;
        }

        /**////
        /// Login to the remote server.
        ///
        public void login()
        {
            this.SetProcessInfoText("连接中");

            clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

            IPEndPoint ep = new IPEndPoint(Dns.Resolve(remoteHost).AddressList[0], remotePort);

            try
            {
                clientSocket.Connect(ep);
            }
            catch (Exception)
            {
                this.SetProcessInfoText("连接失败！");
                // throw new IOException("Couldn't connect to remote server");
            }

            try
            {
                readReply();

                if (retValue != 220)
                {
                    close();
                    // throw new IOException(reply.Substring(4));
                }

                if (debug)
                    Console.WriteLine("USER " + remoteUser);

                this.SetProcessInfoText("检测用户名！");
                sendCommand("USER " + remoteUser);

                if (!(retValue == 331 || retValue == 230))
                {
                    this.SetProcessInfoText("检测用户名失败！");
                    cleanup();
                    // throw new IOException(reply.Substring(4));
                }

                if (retValue != 230)
                {
                    if (debug)
                        Console.WriteLine("PASS xxx");

                    this.SetProcessInfoText("检测用户密码！");
                    sendCommand("PASS " + remotePass);

                    if (!(retValue == 230 || retValue == 202))
                    {
                        this.SetProcessInfoText("检测用户密码失败！");
                        cleanup();
                        // throw new IOException(reply.Substring(4));
                    }
                }

                logined = true;
                // Console.WriteLine("Connected to " + remoteHost);
                this.SetProcessInfoText("连接成功！");

                chdir(remotePath);
            }
            catch (Exception)
            {
                this.SetProcessInfoText("连接失败！");
                // throw new IOException("Couldn't connect to remote server");
            }
        }

        /**////
        /// If the value of mode is true, set binary mode for   downloads.
        /// Else, set Ascii mode.
        ///
        ///
        public void setBinaryMode(Boolean mode)
        {
            if (mode)
            {
                sendCommand("TYPE I");
            }
            else
            {
                sendCommand("TYPE A");
            }
            if (retValue != 200)
            {
                throw new IOException(reply.Substring(4));
            }
        }

        /**////
        /// Download a file to the Assembly's local directory,
        /// keeping the same file name.
        ///
        ///
        public void download(string remFileName)
        {
            download(remFileName, "", false);
        }

        /**////
        /// Download a remote file to the Assembly's local directory,
        /// keeping the same file name, and set the resume flag.
        ///
        ///
        ///
        public void download(string remFileName, Boolean resume)
        {
            download(remFileName, "", resume);
        }

        /**////
        /// Download a remote file to a local file name which can   include
        /// a path. The local file name will be created or overwritten,
        /// but the path must exist.
        ///
        ///
        ///
        public void download(string remFileName, string locFileName)
        {
            download(remFileName, locFileName, false);
        }

        /**////
        /// Download a remote file to a local file name which can include
        /// a path, and set the resume flag. The local file name will be
        /// created or overwritten, but the path must exist.
        ///
        ///
        ///
        ///
        public void download(string remFileName, string locFileName, Boolean resume)
        {
            if (!logined)
            {
                login();
            }
            setBinaryMode(false);

            Console.WriteLine("Downloading file " + remFileName + " from " + remoteHost + "//" + remotePath);

            if (locFileName.Equals(""))
            {
                locFileName = remFileName;
            }

            if (!File.Exists(locFileName))
            {
                Stream st = File.Create(locFileName);
                st.Close();
            }

            FileStream output = new FileStream(locFileName, FileMode.Create);
            Socket cSocket = createDataSocket();
            long offset = 0;

            if (resume)
            {
                offset = output.Length;
                if (offset > 0)
                {
                    setBinaryMode(false);
                    sendCommand("REST " + offset);
                    if (retValue != 350)
                    {
                        //throw new IOException(reply.Substring(4));
                        //Some servers may not support resuming.
                        offset = 0;
                    }
                }

                if (offset > 0)
                {
                    if (debug)
                    {
                        Console.WriteLine("seeking to " + offset);
                    }
                    long npos = output.Seek(offset, SeekOrigin.Begin);
                    Console.WriteLine("new pos=" + npos);
                }
            }

            sendCommand("RETR " + remFileName);

            if (!(retValue == 150 || retValue == 125))
            {
                throw new IOException(reply.Substring(4));
            }


            while (true)
            {
                bytes = cSocket.Receive(buffer, buffer.Length, 0);
                output.Write(buffer, 0, bytes);

                if (bytes <= 0)
                {
                    break;
                }
            }

            output.Close();

            if (cSocket.Connected)
            {
                cSocket.Close();
            }

            Console.WriteLine("");
            readReply();

            if (!(retValue == 226 || retValue == 250))
            {
                throw new IOException(reply.Substring(4));
            }
        }

        /**////
        /// Upload a file.
        ///
        ///
        public void upload(string fileName)
        {
            upload(fileName, false);
        }

        /**////
        /// Upload a file and set the resume flag.
        ///
        ///
        ///
        public void upload(string fileName, Boolean resume)
        {
            if (!logined)
            {
                login();
            }
            Socket cSocket = createDataSocket();
            long offset = 0;

            if (resume)
            {
                try
                {
                    setBinaryMode(true);
                    offset = getFileSize(fileName);
                }
                catch (Exception)
                {
                    offset = 0;
                }
            }

            if (offset > 0)
            {
                sendCommand("REST " + offset);
                if (retValue != 350)
                {
                    //throw new IOException(reply.Substring(4));
                    //Remote server may not support resuming.
                    offset = 0;
                }
            }

            /**//*==========================*/
            sendCommand("STOR " + Path.GetFileName(fileName));
            if (!(retValue == 125 || retValue == 150))
            {
                throw new IOException(reply.Substring(4));
            }

            // open input stream to read source file
            FileStream input = new FileStream(fileName, FileMode.Open);

            if (offset != 0)
            {
                if (debug)
                {
                    Console.WriteLine("seeking to " + offset);
                }
                input.Seek(offset, SeekOrigin.Begin);
            }

            Console.WriteLine("Uploading file " + fileName + " to " + remotePath);

            while ((bytes = input.Read(buffer, 0, buffer.Length)) > 0)
            {
                cSocket.Send(buffer, bytes, 0);
            }

            input.Close();
            Console.WriteLine("");

            if (cSocket.Connected)
            {
                cSocket.Close();
            }

            readReply();
            if (!(retValue == 226 || retValue == 250))
            {
                throw new IOException(reply.Substring(4));
            }
        }

        /**////
        /// Delete a file from the remote FTP server.
        ///
        ///
        public void deleteRemoteFile(string fileName)
        {
            if (!logined)
            {
                login();
            }
            sendCommand("DELE " + fileName);

            if (retValue != 250)
            {
                throw new IOException(reply.Substring(4));
            }
        }

        /**////
        /// Rename a file on the remote FTP server.
        ///
        ///
        ///
        public void renameRemoteFile(string oldFileName, string newFileName)
        {
            if (!logined)
            {
                login();
            }
            sendCommand("RNFR " + oldFileName);

            if (retValue != 350)
            {
                throw new IOException(reply.Substring(4));
            }
            // known problem
            // rnto will not take care of existing file.
            // i.e. It will overwrite if newFileName exist
            sendCommand("RNTO " + newFileName);

            if (retValue != 250)
            {
                throw new IOException(reply.Substring(4));
            }
        }

        /**////
        /// Create a directory on the remote FTP server.
        ///
        ///
        public void mkdir(string dirName)
        {
            if (!logined)
            {
                login();
            }
            sendCommand("MKD " + dirName);

            if (retValue != 250)
            {
                throw new IOException(reply.Substring(4));
            }
        }

        /**////
        /// Delete a directory on the remote FTP server.
        ///
        ///
        public void rmdir(string dirName)
        {
            if (!logined)
            {
                login();
            }

            sendCommand("RMD " + dirName);

            if (retValue != 250)
            {
                throw new IOException(reply.Substring(4));
            }
        }

        /**////
        /// Change the current working directory on the remote FTP   server.
        ///
        ///
        public void chdir(string dirName)
        {
            if (dirName.Equals("."))
            {
                return;
            }
            if (!logined)
            {
                login();
            }
            sendCommand("CWD " + dirName);

            if (retValue != 250)
            {
                throw new IOException(reply.Substring(4));
            }

            this.remotePath = dirName;
            Console.WriteLine("Current directory is " + remotePath);
        }

        /**////
        /// Close the FTP connection.
        ///
        public void close()
        {
            if (clientSocket != null)
            {
                sendCommand("QUIT");
            }
            cleanup();
            Console.WriteLine("Closing");
        }

        /**////
        /// Set debug mode.
        ///
        ///
        public void setDebug(Boolean debug)
        {
            this.debug = debug;
        }

        private void readReply()
        {
            mes = "";
            reply = readLine();
            retValue = Int32.Parse(reply.Substring(0, 3));
        }

        private void cleanup()
        {
            if (clientSocket != null)
            {
                clientSocket.Close();
                clientSocket = null;
            }
            logined = false;
        }

        private string readLine()
        {
            while (true)
            {
                bytes = clientSocket.Receive(buffer, buffer.Length, 0);
                mes += ASCII.GetString(buffer, 0, bytes);
                if (bytes < buffer.Length)
                {
                    break;
                }
            }

            char[] seperator = { '\n' };
            string[] mess = mes.Split(seperator);
            if (mes.Length > 2)
            {
                mes = mess[mess.Length - 2];
            }
            else
            {
                mes = mess[0];
            }

            if (!mes.Substring(3, 1).Equals(" "))
            {
                return readLine();
            }

            if (debug)
            {
                for (int k = 0; k < mess.Length - 1; k++)
                {
                    Console.WriteLine(mess[k]);
                }
            }
            return mes;
        }

        private void sendCommand(String command)
        {
            Byte[] cmdBytes = Encoding.ASCII.GetBytes((command + "\r\n").ToCharArray());
            clientSocket.Send(cmdBytes, cmdBytes.Length, 0);
            readReply();
        }

        private Socket createDataSocket()
        {
            sendCommand("PASV");
            if (retValue != 227)
            {
                throw new IOException(reply.Substring(4));
            }

            int index1 = reply.IndexOf('(');
            int index2 = reply.IndexOf(')');
            string ipData = reply.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 reply: " + reply);
                }
                if (ch == ',' || i + 1 == len)
                {
                    try
                    {
                        parts[partCount++] = Int32.Parse(buf);
                        buf = "";
                    }
                    catch (Exception)
                    {
                        throw new IOException("Malformed PASV reply: " + reply);
                    }
                }
            }

            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);
            s.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.SendTimeout, 5000);

            IPEndPoint ep = new IPEndPoint(Dns.Resolve(ipAddress).AddressList[0], port);

            try
            {
                s.Connect(ep);
            }
            catch (Exception)
            {
                throw new IOException("Can't connect to remote   server");
            }
            return s;
        }

        #endregion

        信息输出方法#region 信息输出方法

        private void SetProcessInfoText(string str)
        {
            try
            {
                if (this.SetProcessInfoEvent != null)
                {
                    this.SetProcessInfoEvent(str);
                }
            }
            catch (Exception err)
            {
                throw (err);
            }
        }

        #endregion
    }
}

2.调用方法

 // 检查此FTP是否可用
                    FTPFactory ftp = new FTPFactory();
                    ftp.setRemoteHost(主机名);
                    ftp.setRemoteUser(用户名);
                    ftp.setRemotePass(密码);
                    ftp.setRemotePort(端口);
                    ftp.setRemotePath(路径);

                    ftp.login();

                    if (!ftp.GetLogin)
                    {
　　　　　　　　　　　　　　//　提示连接失败
                        this.Cursor = Cursors.Default;
                        return;
                    }
                    ftp.close();