C# FTP操作类

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

namespace Common.Helper
{
    /// <summary>
    /// FTP辅助类
    /// </summary>
    public class FTPHelper
    {
        #region 字段
        string ftpURI;
        string ftpUserID;
        string ftpServerIP;
        string ftpPassword;
        string ftpRemotePath;
        #endregion

        /// <summary>  
        /// 连接FTP服务器
        /// </summary>  
        /// <param name="FtpServerIP">FTP连接地址</param>  
        /// <param name="FtpRemotePath">指定FTP连接成功后的当前目录, 如果不指定即默认为根目录</param>  
        /// <param name="FtpUserID">用户名</param>  
        /// <param name="FtpPassword">密码</param>  
        public FTPHelper( string FtpServerIP, string FtpRemotePath, string FtpUserID, string FtpPassword )
        {
            ftpServerIP = FtpServerIP;
            ftpRemotePath = FtpRemotePath;
            ftpUserID = FtpUserID;
            ftpPassword = FtpPassword;
            ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/";
        }

        /// <summary>  
        /// 上传  
        /// </summary>   
        public void Upload( string filename )
        {
            FileInfo fileInf = new FileInfo( filename );
            FtpWebRequest reqFTP;
            reqFTP = (FtpWebRequest)FtpWebRequest.Create( new Uri( ftpURI + fileInf.Name ) );
            reqFTP.Credentials = new NetworkCredential( ftpUserID, ftpPassword );
            reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
            reqFTP.KeepAlive = false;
            reqFTP.UseBinary = true;
            reqFTP.ContentLength = fileInf.Length;
            int buffLength = 2048;
            byte[] buff = new byte[buffLength];
            int contentLen;
            FileStream fs = fileInf.OpenRead();
            try
            {
                Stream strm = reqFTP.GetRequestStream();
                contentLen = fs.Read( buff, 0, buffLength );
                while (contentLen != 0)
                {
                    strm.Write( buff, 0, contentLen );
                    contentLen = fs.Read( buff, 0, buffLength );
                }
                strm.Close();
                fs.Close();
            }
            catch (Exception ex)
            {
                throw new Exception( ex.Message );
            }
        }

        /// <summary>  
        /// 下载  
        /// </summary>   
        public void Download( string filePath, string fileName )
        {
            try
            {
                FileStream outputStream = new FileStream( filePath + "\" + fileName, FileMode.Create );
                FtpWebRequest reqFTP;
                reqFTP = (FtpWebRequest)FtpWebRequest.Create( new Uri( ftpURI + fileName ) );
                reqFTP.Credentials = new NetworkCredential( ftpUserID, ftpPassword );
                reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
                reqFTP.UseBinary = true;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                long cl = response.ContentLength;
                int bufferSize = 2048;
                int readCount;
                byte[] buffer = new byte[bufferSize];
                readCount = ftpStream.Read( buffer, 0, bufferSize );
                while (readCount > 0)
                {
                    outputStream.Write( buffer, 0, readCount );
                    readCount = ftpStream.Read( buffer, 0, bufferSize );
                }
                ftpStream.Close();
                outputStream.Close();
                response.Close();
            }
            catch (Exception ex)
            {
                throw new Exception( ex.Message );
            }
        }

        /// <summary>  
        /// 删除文件  
        /// </summary>  
        public void Delete( string fileName )
        {
            try
            {
                FtpWebRequest reqFTP;
                reqFTP = (FtpWebRequest)FtpWebRequest.Create( new Uri( ftpURI + fileName ) );
                reqFTP.Credentials = new NetworkCredential( ftpUserID, ftpPassword );
                reqFTP.Method = WebRequestMethods.Ftp.DeleteFile;
                reqFTP.KeepAlive = false;
                string result = String.Empty;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                long size = response.ContentLength;
                Stream datastream = response.GetResponseStream();
                StreamReader sr = new StreamReader( datastream );
                result = sr.ReadToEnd();
                sr.Close();
                datastream.Close();
                response.Close();
            }
            catch (Exception ex)
            {
                throw new Exception( ex.Message );
            }
        }

        /// <summary>  
        /// 获取当前目录下明细(包含文件和文件夹)  
        /// </summary>  
        public string[] GetFilesDetailList()
        {
            try
            {
                StringBuilder result = new StringBuilder();
                FtpWebRequest ftp;
                ftp = (FtpWebRequest)FtpWebRequest.Create( new Uri( ftpURI ) );
                ftp.Credentials = new NetworkCredential( ftpUserID, ftpPassword );
                ftp.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
                WebResponse response = ftp.GetResponse();
                StreamReader reader = new StreamReader( response.GetResponseStream() );
                string line = reader.ReadLine();
                line = reader.ReadLine();
                line = reader.ReadLine();
                while (line != null)
                {
                    result.Append( line );
                    result.Append( " " );
                    line = reader.ReadLine();
                }
                result.Remove( result.ToString().LastIndexOf( " " ), 1 );
                reader.Close();
                response.Close();
                return result.ToString().Split( ' ' );
            }
            catch (Exception ex)
            {
                throw new Exception( ex.Message );
            }
        }

        /// <summary>  
        /// 获取FTP文件列表(包括文件夹)
        /// </summary>   
        private string[] GetAllList( string url )
        {
            List<string> list = new List<string>();
            FtpWebRequest req = (FtpWebRequest)WebRequest.Create( new Uri( url ) );
            req.Credentials = new NetworkCredential( ftpPassword, ftpPassword );
            req.Method = WebRequestMethods.Ftp.ListDirectory;
            req.UseBinary = true;
            req.UsePassive = true;
            try
            {
                using (FtpWebResponse res = (FtpWebResponse)req.GetResponse())
                {
                    using (StreamReader sr = new StreamReader( res.GetResponseStream() ))
                    {
                        string s;
                        while ((s = sr.ReadLine()) != null)
                        {
                            list.Add( s );
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                throw (ex);
            }
            return list.ToArray();
        }

        /// <summary>  
        /// 获取当前目录下文件列表(不包括文件夹)  
        /// </summary>  
        public string[] GetFileList( string url )
        {
            StringBuilder result = new StringBuilder();
            FtpWebRequest reqFTP;
            try
            {
                reqFTP = (FtpWebRequest)FtpWebRequest.Create( new Uri( url ) );
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential( ftpPassword, ftpPassword );
                reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
                WebResponse response = reqFTP.GetResponse();
                StreamReader reader = new StreamReader( response.GetResponseStream() );
                string line = reader.ReadLine();
                while (line != null)
                {

                    if (line.IndexOf( "<DIR>" ) == -1)
                    {
                        result.Append( Regex.Match( line, @"[S]+ [S]+", RegexOptions.IgnoreCase ).Value.Split( ' ' )[1] );
                        result.Append( " " );
                    }
                    line = reader.ReadLine();
                }
                result.Remove( result.ToString().LastIndexOf( ' ' ), 1 );
                reader.Close();
                response.Close();
            }
            catch (Exception ex)
            {
                throw (ex);
            }
            return result.ToString().Split( ' ' );
        }

        /// <summary>  
        /// 判断当前目录下指定的文件是否存在  
        /// </summary>  
        /// <param name="RemoteFileName">远程文件名</param>  
        public bool FileExist( string RemoteFileName )
        {
            string[] fileList = GetFileList( "*.*" );
            foreach (string str in fileList)
            {
                if (str.Trim() == RemoteFileName.Trim())
                {
                    return true;
                }
            }
            return false;
        }

        /// <summary>  
        /// 创建文件夹  
        /// </summary>   
        public void MakeDir( string dirName )
        {
            FtpWebRequest reqFTP;
            try
            {
                reqFTP = (FtpWebRequest)FtpWebRequest.Create( new Uri( ftpURI + dirName ) );
                reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential( ftpUserID, ftpPassword );
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                ftpStream.Close();
                response.Close();
            }
            catch (Exception ex)
            { }
        }

        /// <summary>  
        /// 获取指定文件大小  
        /// </summary>  
        public long GetFileSize( string filename )
        {
            FtpWebRequest reqFTP;
            long fileSize = 0;
            try
            {
                reqFTP = (FtpWebRequest)FtpWebRequest.Create( new Uri( ftpURI + filename ) );
                reqFTP.Method = WebRequestMethods.Ftp.GetFileSize;
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential( ftpUserID, ftpPassword );
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                fileSize = response.ContentLength;
                ftpStream.Close();
                response.Close();
            }
            catch (Exception ex)
            { }
            return fileSize;
        }

        /// <summary>  
        /// 更改文件名  
        /// </summary>
        public void ReName( string currentFilename, string newFilename )
        {
            FtpWebRequest reqFTP;
            try
            {
                reqFTP = (FtpWebRequest)FtpWebRequest.Create( new Uri( ftpURI + currentFilename ) );
                reqFTP.Method = WebRequestMethods.Ftp.Rename;
                reqFTP.RenameTo = newFilename;
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential( ftpUserID, ftpPassword );
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                ftpStream.Close();
                response.Close();
            }
            catch (Exception ex)
            { }
        }

        /// <summary>  
        /// 移动文件  
        /// </summary>  
        public void MovieFile( string currentFilename, string newDirectory )
        {
            ReName( currentFilename, newDirectory );
        }

        /// <summary>  
        /// 切换当前目录  
        /// </summary>  
        /// <param name="IsRoot">true:绝对路径 false:相对路径</param>   
        public void GotoDirectory( string DirectoryName, bool IsRoot )
        {
            if (IsRoot)
            {
                ftpRemotePath = DirectoryName;
            }
            else
            {
                ftpRemotePath += DirectoryName + "/";
            }
            ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/";
        }
    }
}