C# 上传下载ftp(支持断点续传)

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C# 上传下载ftp(支持断点续传)

来源: 作者: 时间:2016-01-15 14:58 【

本文整理自网络,由于太多文章类似,此处标识其中一处:点击打开链接using System;using System Collections Generic;using System Linq;using System Text;using System Net Sockets;using Syste

本文整理自网络,由于太多文章类似,此处标识其中一处:点击打开链接

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;
using System.IO;
using System.Net;

namespace JianKunKing.Common.Ftp
{
    /// 
    /// FTP Client(不允许匿名登录)
    /// 上传、已测试,其余未测试
    /// 
    public class FTPClient
    {
        #region 构造函数
        /// 
        /// 缺省构造函数
        /// 
        public FTPClient()
        {
            this.ftpServerIP = ;
            this.remoteFilePath = ;
            this.ftpUserID = ;
            this.ftpPassword = ;
            this.ftpServerPort = 21;
            this.bConnected = false;
        }

        /// 
        /// 构造函数
        /// 
        ///FTP服务器IP地址
        ///当前服务器目录
        ///Ftp 服务器登录用户账号
        ///Ftp 服务器登录用户密码
        ///FTP服务器端口
        public FTPClient(string ftpServerIP, string remoteFilePath, string ftpUserID, string ftpPassword, int ftpServerPort, bool anonymousAccess = false)
        {
            this.ftpServerIP = ftpServerIP;
            this.remoteFilePath = remoteFilePath;
            this.ftpUserID = ftpUserID;
            this.ftpPassword = ftpPassword;
            this.ftpServerPort = ftpServerPort;
            this.Connect();
        }
        #endregion

        #region 登陆字段、属性
        /// 
        /// FTP服务器IP地址
        /// 
        private string ftpServerIP;
        public string FtpServerIP
        {
            get
            {
                return ftpServerIP;
            }
            set
            {
                this.ftpServerIP = value;
            }
        }
        /// 
        /// FTP服务器端口
        /// 
        private int ftpServerPort;
        public int FtpServerPort
        {
            get
            {
                return ftpServerPort;
            }
            set
            {
                this.ftpServerPort = value;
            }
        }
        /// 
        /// 当前服务器目录
        /// 
        private string remoteFilePath;
        public string RemoteFilePath
        {
            get
            {
                return remoteFilePath;
            }
            set
            {
                this.remoteFilePath = value;
            }
        }
        /// 
        /// Ftp 服务器登录用户账号
        /// 
        private string ftpUserID;
        public string FtpUserID
        {
            set
            {
                this.ftpUserID = value;
            }
        }
        /// 
        /// Ftp 服务器用户登录密码
        /// 
        private string ftpPassword;
        public string FtpPassword
        {
            set
            {
                this.ftpPassword = value;
            }
        }

        /// 
        /// 是否登录
        /// 
        private bool bConnected;
        public bool Connected
        {
            get
            {
                return this.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(FtpServerIP), ftpServerPort);
            // 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  + ftpUserID);
            if (!(iReplyCode == 331 || iReplyCode == 230))
            {
                CloseSocketConnect();//关闭连接
                throw new IOException(strReply.Substring(4));
            }
            if (iReplyCode != 230)
            {
                SendCommand(PASS  + ftpPassword);
                if (!(iReplyCode == 230 || iReplyCode == 202))
                {
                    CloseSocketConnect();//关闭连接
                    throw new IOException(strReply.Substring(4));
                }
            }

            bConnected = true;

            // 切换到初始目录
            if (!string.IsNullOrEmpty(remoteFilePath))
            {
                ChDir(remoteFilePath);
            }
        }


        /// 
        /// 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(LIST  + 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 += GB2312.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;
        }


        /// 
        /// 获取文件大小
        /// 
        ///文件名
        /// 文件大小
        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;
        }


        /// 
        /// 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 Download(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
                {
                    if (strFile.LastIndexOf(.) > -1)
                    {
                        Download(strFile.Replace(
, ), strFolder, strFile.Replace(
, ));
                    }
                }
            }
        }

        /// 
        /// 下载目录
        /// 
        ///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 Download(string strRemoteFileName, string strFolder, string strLocalFileName)
        {
            if (strLocalFileName.StartsWith(-r))
            {
                string[] infos = strLocalFileName.Split(' ');
                strRemoteFileName = strLocalFileName = infos[infos.Length - 1];
                if (!this.bConnected)
                {
                    this.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));
                }
                int receiveBytes = 0;
                while (true)
                {
                    int iBytes = socketData.Receive(buffer, buffer.Length, 0);
                    receiveBytes = receiveBytes + iBytes;
                    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));
                    }
                }
            }
        }

        /// 
        /// 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 DownloadFile(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));
                }
            }
        }

        /// 
        /// 下载一个文件(断点续传)
        /// 
        ///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
        ///已下载文件流长度
        public void DownloadBrokenFile(string strRemoteFileName, string strFolder, string strLocalFileName, long size)
        {
            if (!bConnected)
            {
                Connect();
            }
            SetTransferType(TransferType.Binary);
            FileStream output = new
                FileStream(strFolder + \ + strLocalFileName, FileMode.Append);
            Socket socketData = CreateDataSocket();
            SendCommand(REST  + size.ToString());
            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 Upload(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)
                Upload(strFile);
            }
        }


        /// 
        /// 上传一个文件
        /// 
        ///本地文件名
        public void Upload(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.remoteFilePath = 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(为防止出现中文乱码采用 GB2312编码方式)
        /// 
        Encoding GB2312 = Encoding.GetEncoding(gb2312);
        #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 += GB2312.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];
                //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 =
            GB2312.GetBytes((strCommand + 
).ToCharArray());
            socketControl.Send(cmdBytes, cmdBytes.Length, 0);
            ReadReply();
        }

        #endregion

    }

}

 

 

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