Renci.SshNet进行SFTP连接下载删除上传文件

如果对SFTP or FTPS 有过一点点了解的话，那么你肯定知道Renci.SshNet。

其中SftpClient类的构造函数需要传输，远程服务器地址、端口、用户名、密码（有些还有私钥）。下面只是用到账户密码即可，暂时就不说秘钥了。

当你创建了这个实例之后，就可以Connect();打开服务器连接了。

通过ListDirectory()方法你就可以拿到远程目录的文件了。服务器初始文件目录地址为"/",当你那你子目录或者文件即可进行操作。

通过Delete()方法你可以直接根据远程目录直接删除文件 or 文件夹//"/Test.txt"

通过DownloadFile()方法你可以直接更具远程目录以及创建的文件下载文件。

通过UploadFile()方法你可以把本地文件的流上传到远程目录。

 如有问题，我们可以继续探讨。

 public class SFTP
    {
        #region 字段或属性
        private SftpClient sftp;
        /// <summary>
        /// SFTP连接状态
        /// </summary>
        public bool Connected { get { return sftp.IsConnected; } }
        #endregion

        #region 构造
        /// <summary>
        /// 构造
        /// </summary>
        /// <param name="ip">IP</param>
        /// <param name="port">端口</param>
        /// <param name="user">用户名</param>
        /// <param name="pwd">密码</param>
        public SFTPOperation(string ip, string port, string user, string pwd)
        {
            sftp = new SftpClient(ip, Int32.Parse(port), user, pwd);
        }

        public SFTPOperation(string ip, int port, string user, string pwd)
        {
            var authMethods = new List<AuthenticationMethod>();
            var keyboardAuthMethod = new KeyboardInteractiveAuthenticationMethod(user);//键盘模拟连接
            keyboardAuthMethod.AuthenticationPrompt += delegate (Object senderObject, AuthenticationPromptEventArgs eventArgs)
            {
                foreach (var prompt in eventArgs.Prompts)
                {
                    if (prompt.Request.Equals("Password: ", StringComparison.InvariantCultureIgnoreCase))
                    {
                        prompt.Response = pwd;
                    }
                }
            };
            authMethods.Add(new PasswordAuthenticationMethod(user, pwd));
            authMethods.Add(keyboardAuthMethod);
            var connection = new ConnectionInfo(ip, port, user, authMethods.ToArray());
            sftp = new SftpClient(connection);
            sftp.Connect();
        }

        public SFTPOperation(string ip, int port, string user, string passphrase, string keypath)
        {
            var key = File.ReadAllText(keypath);
            PrivateKeyFile keyFile = null;
            using (var buf = new MemoryStream(Encoding.UTF8.GetBytes(key)))
            {
                if (string.IsNullOrWhiteSpace(passphrase))
                {
                    keyFile = new PrivateKeyFile(buf);
                }
                else
                {
                    keyFile = new PrivateKeyFile(buf, passphrase);
                }
            }

            var keyFiles = new[] { keyFile };
            var methods = new List<AuthenticationMethod>
                {
                    new PrivateKeyAuthenticationMethod(user, keyFiles)
                };
            var connection = new ConnectionInfo(ip, port, user, methods.ToArray());
            sftp = new SftpClient(connection);
            sftp.Connect();
        }
        #endregion

        #region 连接SFTP
        /// <summary>
        /// 连接SFTP
        /// </summary>
        /// <returns>true成功</returns>
        public bool Connect()
        {
            try
            {
                if (!Connected)
                {
                    sftp.Connect();
                }
                return true;
            }
            catch (Exception ex)
            {
                throw new Exception(string.Format("连接SFTP失败，原因：{0}", ex.InnerException != null ? ex.InnerException.Message : ex.Message));
            }
        }
        #endregion

        #region 断开SFTP
        /// <summary>
        /// 断开SFTP
        /// </summary> 
        public void Disconnect()
        {
            try
            {
                if (sftp != null && Connected)
                {
                    sftp.Disconnect();
                }
            }
            catch (Exception ex)
            {
                throw new Exception(string.Format("断开SFTP失败，原因：{0}", ex.InnerException != null ? ex.InnerException.Message : ex.Message));
            }
        }
        #endregion

        #region SFTP上传文件
        /// <summary>
        /// SFTP上传文件
        /// </summary>
        /// <param name="localPath">本地路径</param>
        /// <param name="remotePath">远程路径</param>
        public bool Put(string localPath, string remotePath, bool successCloseConnect = false)
        {
            try
            {
                using (var file = File.OpenRead(localPath))
                {
                    Connect();
                    sftp.UploadFile(file, remotePath);
                    Console.WriteLine("上传成功");
                    if (successCloseConnect)
                    {
                        Disconnect();
                    }
                }
                return true;
            }
            catch (Exception ex)
            {
                throw new Exception(string.Format("SFTP文件上传失败，原因：{0}", ex.InnerException != null ? ex.InnerException.Message : ex.Message));
            }
        }
        #endregion

        #region SFTP获取文件
        /// <summary>
        /// SFTP获取文件
        /// </summary>
        /// <param name="remotePath">远程路径</param>
        /// <param name="localPath">本地路径</param>
        public void Get(string remotePath, string localPath)
        {
            try
            {
                //Connect();
                //var test = sftp.Get(remotePath);
                var byt = sftp.ReadAllBytes(remotePath);
                //Disconnect();
                //创建写入流
                using (var fs = new FileStream(localPath, FileMode.CreateNew))
                {
                    var stream = new MemoryStream(byt);
                    byte[] bytes = new byte[1024];
                    int count = 0;
                    int readCount = 0; //从相应流中读取到的文件大小
                    while ((count = stream.Read(bytes, 0, bytes.Length)) > 0)
                    {
                        //写入文件
                        fs.Write(bytes, 0, count);
                        //清空
                        fs.Flush();
                        readCount += count;
                    }
                    stream.Close();
                    var Count = readCount;
                }
            }
            catch (Exception ex)
            {
                throw new Exception(string.Format("SFTP文件获取失败，原因：{0}", ex.InnerException != null ? ex.InnerException.Message : ex.Message));
            }

        }

        public void GetFile(string remotePath, string localPath)
        {
            try
            {
                //创建写入流
                //using (var fs = new FileStream(localPath, FileMode.CreateNew))
                using (var fs = File.OpenWrite(localPath))
                {
                    sftp.DownloadFile(remotePath, fs);
                }
            }
            catch (Exception ex)
            {
                throw new Exception(string.Format("SFTP文件获取失败，原因：{0}", ex.InnerException != null ? ex.InnerException.Message : ex.Message));
            }

        }
        #endregion

        #region 删除SFTP文件
        /// <summary>
        /// 删除SFTP文件 
        /// </summary>
        /// <param name="remoteFile">远程路径</param>
        public void Delete(string remoteFile, bool closeClient = false)
        {
            try
            {
                Connect();
                sftp.Delete(remoteFile);
                if (closeClient)
                {
                    Disconnect();
                }
            }
            catch (Exception ex)
            {
                throw new Exception(string.Format("SFTP文件删除失败，原因：{0}", ex.InnerException != null ? ex.InnerException.Message : ex.Message));
            }
        }
        #endregion

        #region 获取SFTP文件列表
        /// <summary>
        /// 获取SFTP文件列表
        /// </summary>
        /// <param name="remotePath">远程目录</param>
        /// <param name="fileSuffix">文件后缀</param>
        /// <returns></returns>
        public List<string> GetFileList(string remotePath, string fileSuffix)
        {
            try
            {
                //Connect();
                var files = sftp.ListDirectory(remotePath);
                //Disconnect();
                var list = new List<string>();
                foreach (var file in files)
                {
                    string name = file.Name;
                    if (name.Length > (fileSuffix.Length + 1) && fileSuffix == name.Substring(name.Length - fileSuffix.Length))
                    {
                        list.Add(name);
                    }
                }
                return list;
            }
            catch (Exception ex)
            {
                throw new Exception(string.Format("SFTP文件列表获取失败，原因：{0}", ex.InnerException != null ? ex.InnerException.Message : ex.Message));
            }
        }
        #endregion

        #region 移动SFTP文件
        /// <summary>
        /// 移动SFTP文件
        /// </summary>
        /// <param name="oldRemotePath">旧远程路径</param>
        /// <param name="newRemotePath">新远程路径</param>
        public void Move(string oldRemotePath, string newRemotePath)
        {
            try
            {
                Connect();
                sftp.RenameFile(oldRemotePath, newRemotePath);
                Disconnect();
            }
            catch (Exception ex)
            {
                throw new Exception(string.Format("SFTP文件移动失败，原因：{0}", ex.InnerException != null ? ex.InnerException.Message : ex.Message));
            }
        }
        #endregion

    }