C#操作FTP, FTPHelper和SFTPHelper

1. FTPHelper

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

public class FTPHelper
    {
        /// <summary>
        /// 上传文件
        /// </summary>
        /// <param name="fileinfo">需要上传的文件</param>
        /// <param name="targetDir">目标路径</param>
        /// <param name="hostname">ftp地址</param>
        /// <param name="username">ftp用户名</param>
        /// <param name="password">ftp密码</param>
        public static void UploadFile(FileInfo fileinfo, string targetDir, string hostname, string username, string password)
        {
            //1. check target
            string target;
            if (targetDir.Trim() == "")
            {
                return;
            }
            string filename = fileinfo.Name;
            if (!string.IsNullOrEmpty(filename))
                target = filename;
            else
                target = Guid.NewGuid().ToString();  //使用临时文件名

            string URI = "FTP://" + hostname + "/" + targetDir + "/" + target;
            ///WebClient webcl = new WebClient();
            System.Net.FtpWebRequest ftp = GetRequest(URI, username, password);

            //设置FTP命令 设置所要执行的FTP命令，
            //ftp.Method = System.Net.WebRequestMethods.Ftp.ListDirectoryDetails;//假设此处为显示指定路径下的文件列表
            ftp.Method = System.Net.WebRequestMethods.Ftp.UploadFile;
            //指定文件传输的数据类型
            ftp.UseBinary = true;
            ftp.UsePassive = true;

            //告诉ftp文件大小
            ftp.ContentLength = fileinfo.Length;
            //缓冲大小设置为2KB
            const int BufferSize = 2048;
            byte[] content = new byte[BufferSize - 1 + 1];
            int dataRead;

            //打开一个文件流 (System.IO.FileStream) 去读上传的文件
            using (FileStream fs = fileinfo.OpenRead())
            {
                try
                {
                    //把上传的文件写入流
                    using (Stream rs = ftp.GetRequestStream())
                    {
                        do
                        {
                            //每次读文件流的2KB
                            dataRead = fs.Read(content, 0, BufferSize);
                            rs.Write(content, 0, dataRead);
                        } while (!(dataRead < BufferSize));
                        rs.Close();
                    }

                }
                catch (Exception ex) { }
                finally
                {
                    fs.Close();
                }

            }

            ftp = null;
        }

        /// <summary>
        /// 下载文件
        /// </summary>
        /// <param name="localDir">下载至本地路径</param>
        /// <param name="FtpDir">ftp目标文件路径</param>
        /// <param name="FtpFile">从ftp要下载的文件名</param>
        /// <param name="hostname">ftp地址即IP</param>
        /// <param name="username">ftp用户名</param>
        /// <param name="password">ftp密码</param>
        public static void DownloadFile(string localDir, string FtpDir, string FtpFile, string hostname, string username, string password)
        {
            string URI = "FTP://" + hostname + "/" + FtpDir + "/" + FtpFile;
            string tmpname = Guid.NewGuid().ToString();
            string localfile = localDir + @"" + tmpname;

            System.Net.FtpWebRequest ftp = GetRequest(URI, username, password);
            ftp.Method = System.Net.WebRequestMethods.Ftp.DownloadFile;
            ftp.UseBinary = true;
            ftp.UsePassive = false;

            using (FtpWebResponse response = (FtpWebResponse)ftp.GetResponse())
            {
                using (Stream responseStream = response.GetResponseStream())
                {
                    //loop to read & write to file
                    using (FileStream fs = new FileStream(localfile, FileMode.CreateNew))
                    {
                        try
                        {
                            byte[] buffer = new byte[2048];
                            int read = 0;
                            do
                            {
                                read = responseStream.Read(buffer, 0, buffer.Length);
                                fs.Write(buffer, 0, read);
                            } while (!(read == 0));
                            responseStream.Close();
                            fs.Flush();
                            fs.Close();
                        }
                        catch (Exception)
                        {
                            //catch error and delete file only partially downloaded
                            fs.Close();
                            //delete target file as it's incomplete
                            File.Delete(localfile);
                            throw;
                        }
                    }

                    responseStream.Close();
                }

                response.Close();
            }



            try
            {
                File.Delete(localDir + @"" + FtpFile);
                File.Move(localfile, localDir + @"" + FtpFile);


                ftp = null;
                ftp = GetRequest(URI, username, password);
                ftp.Method = System.Net.WebRequestMethods.Ftp.DeleteFile;
                ftp.GetResponse();

            }
            catch (Exception ex)
            {
                File.Delete(localfile);
                throw ex;
            }

            // 记录日志 "从" + URI.ToString() + "下载到" + localDir + @"" + FtpFile + "成功." );
            ftp = null;
        }


        /// <summary>
        /// 下载文件
        /// </summary>
        /// <param name="localDir">下载至本地路径</param>
        /// <param name="FtpDir">ftp目标文件路径</param>
        /// <param name="FtpFile">从ftp要下载的文件名</param>
        /// <param name="hostname">ftp地址即IP</param>
        /// <param name="username">ftp用户名</param>
        /// <param name="password">ftp密码</param>
        public static byte[] DownloadFileBytes(string localDir, string FtpDir, string FtpFile, string hostname, string username, string password)
        {
            byte[] bts;
            string URI = "FTP://" + hostname + "/" + FtpDir + "/" + FtpFile;
            string tmpname = Guid.NewGuid().ToString();
            string localfile = localDir + @"" + tmpname;

            System.Net.FtpWebRequest ftp = GetRequest(URI, username, password);
            ftp.Method = System.Net.WebRequestMethods.Ftp.DownloadFile;
            ftp.UseBinary = true;
            ftp.UsePassive = true;

            using (FtpWebResponse response = (FtpWebResponse)ftp.GetResponse())
            {
                using (Stream responseStream = response.GetResponseStream())
                {
                    //loop to read & write to file
                    using (MemoryStream fs = new MemoryStream())
                    {
                        try
                        {
                            byte[] buffer = new byte[2048];
                            int read = 0;
                            do
                            {
                                read = responseStream.Read(buffer, 0, buffer.Length);
                                fs.Write(buffer, 0, read);
                            } while (!(read == 0));
                            responseStream.Close();

                            //---
                            byte[] mbt = new byte[fs.Length];
                            fs.Read(mbt, 0, mbt.Length);

                            bts = mbt;
                            //---
                            fs.Flush();
                            fs.Close();
                        }
                        catch (Exception)
                        {
                            //catch error and delete file only partially downloaded
                            fs.Close();
                            //delete target file as it's incomplete
                            File.Delete(localfile);
                            throw;
                        }
                    }

                    responseStream.Close();
                }

                response.Close();
            }

            ftp = null;
            return bts;
        }

        /// <summary>
        /// 搜索远程文件
        /// </summary>
        /// <param name="targetDir"></param>
        /// <param name="hostname"></param>
        /// <param name="username"></param>
        /// <param name="password"></param>
        /// <param name="SearchPattern"></param>
        /// <returns></returns>
        public static List<string> ListDirectory(string targetDir, string hostname, string username, string password, string SearchPattern)
        {
            List<string> result = new List<string>();
            try
            {
                string URI = "FTP://" + hostname + "/" + targetDir + "/" + SearchPattern;

                System.Net.FtpWebRequest ftp = GetRequest(URI, username, password);
                ftp.Method = System.Net.WebRequestMethods.Ftp.ListDirectory;
                ftp.UsePassive = true;
                ftp.UseBinary = true;


                string str = GetStringResponse(ftp);
                str = str.Replace("
", "
").TrimEnd('
');
                str = str.Replace("
", "
");
                if (str != string.Empty)
                    result.AddRange(str.Split('
'));

                return result;
            }
            catch { }
            return null;
        }

        private static string GetStringResponse(FtpWebRequest ftp)
        {
            //Get the result, streaming to a string
            string result = "";
            using (FtpWebResponse response = (FtpWebResponse)ftp.GetResponse())
            {
                long size = response.ContentLength;
                using (Stream datastream = response.GetResponseStream())
                {
                    using (StreamReader sr = new StreamReader(datastream, System.Text.Encoding.Default))
                    {
                        result = sr.ReadToEnd();
                        sr.Close();
                    }

                    datastream.Close();
                }

                response.Close();
            }

            return result;
        }

        /// 在ftp服务器上创建目录
        /// </summary>
        /// <param name="dirName">创建的目录名称</param>
        /// <param name="ftpHostIP">ftp地址</param>
        /// <param name="username">用户名</param>
        /// <param name="password">密码</param>
        public void MakeDir(string dirName, string ftpHostIP, string username, string password)
        {
            try
            {
                string uri = "ftp://" + ftpHostIP + "/" + dirName;
                System.Net.FtpWebRequest ftp = GetRequest(uri, username, password);
                ftp.Method = WebRequestMethods.Ftp.MakeDirectory;

                FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();
                response.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }

        /// <summary>
        /// 删除文件
        /// </summary>
        /// <param name="dirName">创建的目录名称</param>
        /// <param name="ftpHostIP">ftp地址</param>
        /// <param name="username">用户名</param>
        /// <param name="password">密码</param>
        public static void delFile(string dirName, string filename, string ftpHostIP, string username, string password)
        {
            try
            {
                string uri = "ftp://" + ftpHostIP + "/";
                if (!string.IsNullOrEmpty(dirName)) {
                    uri += dirName + "/";
                }
                uri += filename;
                System.Net.FtpWebRequest ftp = GetRequest(uri, username, password);
                ftp.Method = WebRequestMethods.Ftp.DeleteFile;
                FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();
                response.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }

        /// <summary>
        /// 删除目录
        /// </summary>
        /// <param name="dirName">创建的目录名称</param>
        /// <param name="ftpHostIP">ftp地址</param>
        /// <param name="username">用户名</param>
        /// <param name="password">密码</param>
        public void delDir(string dirName, string ftpHostIP, string username, string password)
        {
            try
            {
                string uri = "ftp://" + ftpHostIP + "/" + dirName;
                System.Net.FtpWebRequest ftp = GetRequest(uri, username, password);
                ftp.Method = WebRequestMethods.Ftp.RemoveDirectory;
                FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();
                response.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }

        /// <summary>
        /// 文件重命名
        /// </summary>
        /// <param name="currentFilename">当前目录名称</param>
        /// <param name="newFilename">重命名目录名称</param>
        /// <param name="ftpServerIP">ftp地址</param>
        /// <param name="username">用户名</param>
        /// <param name="password">密码</param>
        public void Rename(string currentFilename, string newFilename, string ftpServerIP, string username, string password)
        {
            try
            {

                FileInfo fileInf = new FileInfo(currentFilename);
                string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;
                System.Net.FtpWebRequest ftp = GetRequest(uri, username, password);
                ftp.Method = WebRequestMethods.Ftp.Rename;

                ftp.RenameTo = newFilename;
                FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();

                response.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }

        private static FtpWebRequest GetRequest(string URI, string username, string password)
        {
            //根据服务器信息FtpWebRequest创建类的对象
            FtpWebRequest result = (FtpWebRequest)FtpWebRequest.Create(URI);
            //提供身份验证信息
            result.Credentials = new System.Net.NetworkCredential(username, password);
            //设置请求完成之后是否保持到FTP服务器的控制连接，默认值为true
            result.KeepAlive = false;
            return result;
        }

        /*
        /// <summary>
        /// 向Ftp服务器上传文件并创建和本地相同的目录结构
        /// 遍历目录和子目录的文件
        /// </summary>
        /// <param name="file"></param>
        private void GetFileSystemInfos(FileSystemInfo file)
        {
            string getDirecName = file.Name;
            if (!ftpIsExistsFile(getDirecName, "192.168.0.172", "Anonymous", "") && file.Name.Equals(FileName))
            {
                MakeDir(getDirecName, "192.168.0.172", "Anonymous", "");
            }
            if (!file.Exists) return;
            DirectoryInfo dire = file as DirectoryInfo;
            if (dire == null) return;
            FileSystemInfo[] files = dire.GetFileSystemInfos();

            for (int i = 0; i < files.Length; i++)
            {
                FileInfo fi = files[i] as FileInfo;
                if (fi != null)
                {
                    DirectoryInfo DirecObj = fi.Directory;
                    string DireObjName = DirecObj.Name;
                    if (FileName.Equals(DireObjName))
                    {
                        UploadFile(fi, DireObjName, "192.168.0.172", "Anonymous", "");
                    }
                    else
                    {
                        Match m = Regex.Match(files[i].FullName, FileName + "+.*" + DireObjName);
                        //UploadFile(fi, FileName+"/"+DireObjName, "192.168.0.172", "Anonymous", "");
                        UploadFile(fi, m.ToString(), "192.168.0.172", "Anonymous", "");
                    }
                }
                else
                {
                    string[] ArrayStr = files[i].FullName.Split('\');
                    string finame = files[i].Name;
                    Match m = Regex.Match(files[i].FullName, FileName + "+.*" + finame);
                    //MakeDir(ArrayStr[ArrayStr.Length - 2].ToString() + "/" + finame, "192.168.0.172", "Anonymous", "");
                    MakeDir(m.ToString(), "192.168.0.172", "Anonymous", "");
                    GetFileSystemInfos(files[i]);
                }
            }
        }
         * */

        /// <summary>
        /// 判断ftp服务器上该目录是否存在
        /// </summary>
        /// <param name="dirName"></param>
        /// <param name="ftpHostIP"></param>
        /// <param name="username"></param>
        /// <param name="password"></param>
        /// <returns></returns>
        private bool ftpIsExistsFile(string dirName, string ftpHostIP, string username, string password)
        {
            bool flag = true;
            try
            {
                string uri = "ftp://" + ftpHostIP + "/" + dirName;
                System.Net.FtpWebRequest ftp = GetRequest(uri, username, password);
                ftp.Method = WebRequestMethods.Ftp.ListDirectory;

                FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();
                response.Close();
            }
            catch (Exception)
            {
                flag = false;
            }
            return flag;
        }
    }

2. SFTPHelper

SFTPHelper采用第三方的Tamir.SharpSSH.dll

下载地址: http://www.tamirgal.com/blog/page/SharpSSH.aspx

using System;
using Tamir.SharpSsh.jsch;
using System.Collections;


public class SFTPHelper
{
    private Session m_session;
    private Channel m_channel;
    private ChannelSftp m_sftp;

    //host:sftp地址   user：用户名   pwd：密码        
    public SFTPHelper(string host, string user, string pwd)
    {
        string[] arr = host.Split(':');
        string ip = arr[0];
        int port = 22;
        if (arr.Length > 1) port = Int32.Parse(arr[1]);

        JSch jsch = new JSch();
        m_session = jsch.getSession(user, ip, port);
        MyUserInfo ui = new MyUserInfo();
        ui.setPassword(pwd);
        m_session.setUserInfo(ui);

    }

    //SFTP连接状态        
    public bool Connected { get { return m_session.isConnected(); } }

    //连接SFTP        
    public bool Connect()
    {
        try
        {
            if (!Connected)
            {
                m_session.connect();
                m_channel = m_session.openChannel("sftp");
                m_channel.connect();
                m_sftp = (ChannelSftp)m_channel;
            }
            return true;
        }
        catch
        {
            return false;
        }
    }

    //断开SFTP        
    public void Disconnect()
    {
        if (Connected)
        {
            m_channel.disconnect();
            m_session.disconnect();
        }
    }

    //SFTP存放文件        
    public bool Put(string localPath, string remotePath)
    {
        try
        {
            Tamir.SharpSsh.java.String src = new Tamir.SharpSsh.java.String(localPath);
            Tamir.SharpSsh.java.String dst = new Tamir.SharpSsh.java.String(remotePath);
            m_sftp.put(src, dst);
            return true;
        }
        catch
        {
            return false;
        }
    }

    //SFTP获取文件        
    public bool Get(string remotePath, string localPath)
    {
        try
        {
            Tamir.SharpSsh.java.String src = new Tamir.SharpSsh.java.String(remotePath);
            Tamir.SharpSsh.java.String dst = new Tamir.SharpSsh.java.String(localPath);
            m_sftp.get(src, dst);
            return true;
        }
        catch
        {
            return false;
        }
    }
    //删除SFTP文件
    public bool Delete(string remoteFile)
    {
        try
        {
            m_sftp.rm(remoteFile);
            return true;
        }
        catch
        {
            return false;
        }
    }

    //获取SFTP文件列表        
    public ArrayList GetFileList(string remotePath, string fileType)
    {
        try
        {
            Tamir.SharpSsh.java.util.Vector vvv = m_sftp.ls(remotePath);
            ArrayList objList = new ArrayList();
            foreach (Tamir.SharpSsh.jsch.ChannelSftp.LsEntry qqq in vvv)
            {
                string sss = qqq.getFilename();
                if (sss.Length > (fileType.Length + 1) && fileType == sss.Substring(sss.Length - fileType.Length))
                { objList.Add(sss); }
                else { continue; }
            }

            return objList;
        }
        catch
        {
            return null;
        }
    }


    //登录验证信息        
    public class MyUserInfo : UserInfo
    {
        String passwd;
        public String getPassword() { return passwd; }
        public void setPassword(String passwd) { this.passwd = passwd; }

        public String getPassphrase() { return null; }
        public bool promptPassphrase(String message) { return true; }

        public bool promptPassword(String message) { return true; }
        public bool promptYesNo(String message) { return true; }
        public void showMessage(String message) { }
    }


}