FTPClient

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

public class FTPClient
{
    public static object obj = new object();

    #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>
    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 字段
    private int strRemotePort;
    private Boolean bConnected;
    private string strRemoteHost;
    private string strRemotePass;
    private string strRemoteUser;
    private string strRemotePath;

    /// <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;
    /// <summary>
    /// 编码方式
    /// </summary>
    Encoding ASCII = Encoding.ASCII;
    /// <summary>
    /// 字节数组
    /// </summary>
    Byte[] buffer = new Byte[BLOCK_SIZE];
    #endregion

    #region 属性
    /// <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()
    {
        lock (obj)
        {
            socketControl = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPEndPoint ep = new IPEndPoint(IPAddress.Parse(RemoteHost), strRemotePort);
            try
            {
                socketControl.Connect(ep);
            }
            catch (Exception)
            {
                throw new IOException("不能连接ftp服务器");
            }
        }
        ReadReply();
        if (iReplyCode != 220)
        {
            DisConnect();
            throw new IOException(strReply.Substring(4));
        }
        SendCommand("USER " + strRemoteUser);
        if (!(iReplyCode == 331 || iReplyCode == 230))
        {
            CloseSocketConnect();
            throw new IOException(strReply.Substring(4));
        }
        if (iReplyCode != 230)
        {
            SendCommand("PASS " + strRemotePass);
            if (!(iReplyCode == 230 || iReplyCode == 202))
            {
                CloseSocketConnect();
                throw new IOException(strReply.Substring(4));
            }
        }
        bConnected = true;
        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>
    public string[] Dir(string strMask)
    {
        if (!bConnected)
        {
            Connect();
        }
        Socket socketData = CreateDataSocket();
        SendCommand("NLST " + strMask);
        if (!(iReplyCode == 150 || iReplyCode == 125 || iReplyCode == 226))
        {
            throw new IOException(strReply.Substring(4));
        }
        strMsg = "";
        Thread.Sleep(2000);
        while (true)
        {
            int iBytes = socketData.Receive(buffer, buffer.Length, 0);
            strMsg += ASCII.GetString(buffer, 0, iBytes);
            if (iBytes < buffer.Length)
            {
                break;
            }
        }
        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;
    }

    public void newPutByGuid(string strFileName, string strGuid)
    {
        if (!bConnected)
        {
            Connect();
        }
        string str = strFileName.Substring(0, strFileName.LastIndexOf("\"));
        string strTypeName = strFileName.Substring(strFileName.LastIndexOf("."));
        strGuid = str + "\" + strGuid;
        Socket socketData = CreateDataSocket();
        SendCommand("STOR " + Path.GetFileName(strGuid));
        if (!(iReplyCode == 125 || iReplyCode == 150))
        {
            throw new IOException(strReply.Substring(4));
        }
        FileStream input = new FileStream(strGuid, FileMode.Open);
        input.Flush();
        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));
            }
        }
    }

    /// <summary>
    /// 获取文件大小
    /// </summary>
    /// <param name="strFileName">文件名</param>
    /// <returns>文件大小</returns>
    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>
    /// 获取文件信息
    /// </summary>
    /// <param name="strFileName">文件名</param>
    /// <returns>文件大小</returns>
    public string GetFileInfo(string strFileName)
    {
        if (!bConnected)
        {
            Connect();
        }
        Socket socketData = CreateDataSocket();
        SendCommand("LIST " + strFileName);
        string strResult = "";
        if (!(iReplyCode == 150 || iReplyCode == 125
            || iReplyCode == 226 || iReplyCode == 250))
        {
            throw new IOException(strReply.Substring(4));
        }
        byte[] b = new byte[512];
        MemoryStream ms = new MemoryStream();

        while (true)
        {
            int iBytes = socketData.Receive(b, b.Length, 0);
            ms.Write(b, 0, iBytes);
            if (iBytes <= 0)
            {

                break;
            }
        }
        byte[] bt = ms.GetBuffer();
        strResult = System.Text.Encoding.ASCII.GetString(bt);
        ms.Close();
        return strResult;
    }

    /// <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)
    {
        Socket socketData = CreateDataSocket();
        try
        {
            if (!bConnected)
            {
                Connect();
            }
            SetTransferType(TransferType.Binary);
            if (strLocalFileName.Equals(""))
            {
                strLocalFileName = strRemoteFileName;
            }
            SendCommand("RETR " + strRemoteFileName);
            if (!(iReplyCode == 150 || iReplyCode == 125|| iReplyCode == 226 || iReplyCode == 250))
            {
                throw new IOException(strReply.Substring(4));
            }
            FileStream output = new FileStream(strFolder + "\" + strLocalFileName, FileMode.Create);
            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));
                }
            }
        }
        catch
        {
            socketData.Close();
            socketData = null;
            socketControl.Close();
            bConnected = false;
            socketControl = null;
        }
    }

    /// <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 GetNoBinary(string strRemoteFileName, string strFolder, string strLocalFileName)
    {
        if (!bConnected)
        {
            Connect();
        }

        if (strLocalFileName.Equals(""))
        {
            strLocalFileName = strRemoteFileName;
        }
        Socket socketData = CreateDataSocket();
        SendCommand("RETR " + strRemoteFileName);
        if (!(iReplyCode == 150 || iReplyCode == 125|| iReplyCode == 226 || iReplyCode == 250))
        {
            throw new IOException(strReply.Substring(4));
        }
        FileStream output = new FileStream(strFolder + "\" + strLocalFileName, FileMode.Create);
        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)
        {
            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();
        if (Path.GetExtension(strFileName) == "")
            SendCommand("STOR " + Path.GetFileNameWithoutExtension(strFileName));
        else
            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));
            }
        }
    }

    /// <summary>
    /// 上传一个文件
    /// </summary>
    /// <param name="strFileName">本地文件名</param>
    public void PutByGuid(string strFileName, string strGuid)
    {
        if (!bConnected)
        {
            Connect();
        }
        string str = strFileName.Substring(0, strFileName.LastIndexOf("\"));
        string strTypeName = strFileName.Substring(strFileName.LastIndexOf("."));
        strGuid = str + "\" + strGuid;
        System.IO.File.Copy(strFileName, strGuid);
        System.IO.File.SetAttributes(strGuid, System.IO.FileAttributes.Normal);
        Socket socketData = CreateDataSocket();
        SendCommand("STOR " + Path.GetFileName(strGuid));
        if (!(iReplyCode == 125 || iReplyCode == 150))
        {
            throw new IOException(strReply.Substring(4));
        }
        FileStream input = new  FileStream(strGuid, FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read);
        int iBytes = 0;
        while ((iBytes = input.Read(buffer, 0, buffer.Length)) > 0)
        {
            socketData.Send(buffer, iBytes, 0);
        }
        input.Close();
        File.Delete(strGuid);
        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("无法连接ftp服务器");
        }
        return s;
    }

    /// <summary>
    /// 关闭socket连接(用于登录以前)
    /// </summary>
    private void CloseSocketConnect()
    {
        lock (obj)
        {
            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()
    {
        lock (obj)
        {
            while (true)
            {
                int iBytes = socketControl.Receive(buffer, buffer.Length, 0);
                strMsg += ASCII.GetString(buffer, 0, iBytes);
                if (iBytes < buffer.Length)
                {
                    break;
                }
            }
        }
        char[] seperator = { ' ' };
        string[] mess = strMsg.Split(seperator);
        if (strMsg.Length > 2)
        {
            strMsg = mess[mess.Length - 2];
        }
        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>
    public void SendCommand(String strCommand)
    {
        lock (obj)
        {
            Byte[] cmdBytes = Encoding.ASCII.GetBytes((strCommand + " ").ToCharArray());
            socketControl.Send(cmdBytes, cmdBytes.Length, 0);
            Thread.Sleep(500);
            ReadReply();
        }
    }
    #endregion
}