FTP helper 类

FTP,(File Transfer Protocol),就是文件传输协议。用于互联网双向传输，控制文件下载空间在服务器复制文件从本地计算机或本地上传文件复制到服务器上的空间。
因为有一个奇葩的需求，客户要求把一个服务器的文件拷贝到另一个服务器还要求用ftp。所以研究了一番ftp.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Net;
using System.Windows.Forms;

namespace TestFTP
{
    public class FtpHelper
    {
        private string ftpServerIP;
        private string ftpRemotePath;
        private string ftpUserID;
        private string ftpPassword;
        private string ftpURI;
        /// <summary>
        /// 连接FTP
        /// </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 ServerIP, string RemotePath, string UserID, string Password)
        {
            ftpServerIP = ServerIP;
            ftpRemotePath = RemotePath;
            ftpUserID = UserID;
            ftpPassword = Password;
            ftpURI = "ftp://" + ftpServerIP + ftpRemotePath + "/";
        }
 
        /// <summary>
        /// 上传
        /// </summary>
        /// <param name="filename">文件名</param>
        public void UploadFile(string FileName)
        {
            FileInfo fileInfo = new FileInfo(FileName);
            string uri = ftpURI + fileInfo.Name;
            FtpWebRequest reqFTP;
 
            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
            reqFTP.KeepAlive = false;
            reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
            reqFTP.UseBinary = true;
            reqFTP.UsePassive = false;
            reqFTP.ContentLength = fileInfo.Length;
            int BufferSize = 2048;
            byte[] buff = new byte[BufferSize];
            int ContentLength;
            FileStream fs = fileInfo.OpenRead();
            try
            {
                Stream strm = reqFTP.GetRequestStream();
                ContentLength = fs.Read(buff, 0, BufferSize);
                while (ContentLength != 0)
                {
                    strm.Write(buff, 0, ContentLength);
                    ContentLength = fs.Read(buff, 0, BufferSize);
                }
 
                strm.Close();
                fs.Close();
            }
            catch (Exception ex)
            {
                throw new Exception("Ftphelper Upload Error --> " + ex.Message);
            }
        }
 
        /// <summary>
        /// 下载
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <param name="fileName">文件名</param>
        public void DownloadFile(string FileName, string LocalSavePath)
        {
            FtpWebRequest reqFTP;
            try
            {
                FileStream outputStream = new FileStream(LocalSavePath, FileMode.Create);
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpUserID + ":" + ftpPassword + "@" + ftpServerIP + "/" + FileName));
                reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                reqFTP.UsePassive = false;
                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 ex;
                MessageBox.Show("ex: " + ex);
            }
        }
 
        /// <summary>
        /// 删除文件夹
        /// </summary>
        /// <param name="folderName">文件夹名</param>
        public void RemoveDirectory(string folderName)
        {
            try
            {
                string uri = ftpURI + folderName;
                FtpWebRequest reqFTP;
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
 
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                reqFTP.KeepAlive = false;
                reqFTP.Method = WebRequestMethods.Ftp.RemoveDirectory;
                reqFTP.UsePassive = 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("FtpHelper Delete Error --> " + ex.Message + "  文件名:" + folderName);
            }
        }
 
        /// <summary>
        /// 获取当前目录下明细(包含文件和文件夹)
        /// </summary>
        /// <returns>名称数组</returns>
        public string[] GetFilesDetailList()
        {
            string[] downloadFiles;
            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;
                ftp.UsePassive = false;
                WebResponse response = ftp.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.Default);
 
                //while (reader.Read() > 0)
                //{
 
                //}
                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)
            {
                downloadFiles = null;
                throw new Exception("FtpHelper  Error --> " + ex.Message);
            }
        }
 
        /// <summary>
        /// 获取当前目录下文件列表(仅文件)
        /// </summary>
        /// <returns></returns>
        public string[] GetFileList(string mask)
        {
            string[] downloadFiles;
            StringBuilder result = new StringBuilder();
            FtpWebRequest reqFTP;
            try
            {
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI));
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                reqFTP.Method = WebRequestMethods.Ftp.ListDirectory;
                reqFTP.UsePassive = false;
                WebResponse response = reqFTP.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.Default);
 
                string line = reader.ReadLine();
                while (line != null)
                {
                    if (mask.Trim() != string.Empty && mask.Trim() != "*.*")
                    {
 
                        string mask_ = mask.Substring(0, mask.IndexOf("*"));
                        if (line.Substring(0, mask_.Length) == mask_)
                        {
                            result.Append(line);
                            result.Append("
");
                        }
                    }
                    else
                    {
                        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)
            {
                downloadFiles = null;
                if (ex.Message.Trim() != "远程服务器返回错误: (550) 文件不可用(例如，未找到文件，无法访问文件)。")
                {
                    throw new Exception("FtpHelper GetFileList Error --> " + ex.Message.ToString());
                }
                return downloadFiles;
            }
        }
 
        /// <summary>
        /// 获取当前目录下所有的文件夹列表(仅文件夹)
        /// </summary>
        /// <returns></returns>
        public string[] GetDirectoryList()
        {
            string[] drectory = GetFilesDetailList();
            string m = string.Empty;
            foreach (string str in drectory)
            {
                int dirPos = str.IndexOf("<DIR>");
                if (dirPos > 0)
                {
                    /*判断 Windows 风格*/
                    m += str.Substring(dirPos + 5).Trim() + "
";
                }
                else if (str.Trim().Substring(0, 1).ToUpper() == "D")
                {
                    /*判断 Unix 风格*/
                    string dir = str.Substring(54).Trim();
                    if (dir != "." && dir != "..")
                    {
                        m += dir + "
";
                    }
                }
            }
 
            char[] n = new char[] { '
' };
            return m.Split(n);
        }
 
        /// <summary>
        /// 判断当前目录下指定的子目录是否存在
        /// </summary>
        /// <param name="RemoteDirectoryName">指定的目录名</param>
        public bool DirectoryExist(string RemoteDirectoryName)
        {
            string[] dirList = GetDirectoryList();
            foreach (string str in dirList)
            {
                if (str.Trim() == RemoteDirectoryName.Trim())
                {
                    return true;
                }
            }
            return false;
        }
 
        /// <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>
        /// <param name="dirName"></param>
        public void MakeDir(string dirName)
        {
            FtpWebRequest reqFTP;
            try
            {
                // dirName = name of the directory to create.
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + dirName));
                reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;
                reqFTP.UseBinary = true;
                reqFTP.UsePassive = false;
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
 
                ftpStream.Close();
                response.Close();
            }
            catch (Exception ex)
            {
                throw new Exception("FtpHelper MakeDir Error --> " + ex.Message);
            }
        }
 
        /// <summary>
        /// 获取指定文件大小
        /// </summary>
        /// <param name="filename"></param>
        /// <returns></returns>
        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.UsePassive = false;
                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)
            {
                throw new Exception("FtpHelper GetFileSize Error --> " + ex.Message);
            }
            return fileSize;
        }
 
        /// <summary>
        /// 改名
        /// </summary>
        /// <param name="currentFilename"></param>
        /// <param name="newFilename"></param>
        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.UsePassive = false;
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
 
                ftpStream.Close();
                response.Close();
            }
            catch (Exception ex)
            {
                throw new Exception("FtpHelper ReName Error --> " + ex.Message);
            }
        }
 
        /// <summary>
        /// 移动文件
        /// </summary>
        /// <param name="currentFilename"></param>
        /// <param name="newFilename"></param>
        public void MovieFile(string currentFilename, string newDirectory)
        {
            ReName(currentFilename, newDirectory);
        }
 
        /// <summary>
        /// 切换当前目录
        /// </summary>
        /// <param name="DirectoryName"></param>
        /// <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 + "/";
        }
 
    }
}