.net 对sftp服务器上文件的操作

由于服务商从FTP服务器迁移到SFTP服务器，唉~~~，苦逼的我们就改来该去的吧。现在来稍微说说这个是怎么实现的。

----------------------------------------我是无耻的分割线------------------------------------------------------------

就不赘述FTP和SFTP的区别了，只提一点在一定的程度上后者更安全，需要的同学请移步http://www.cnblogs.com/mfryf/archive/2013/05/29/3107286.html了解更多，谢谢！

好了，既然要到服务器上去操作文件，我们首先要登陆服务器，就像登陆其他服务器一样，我们需要一个地址、用户名、密码，可能还需要一个端口号。

这里我是借助于一个第三方的插件，SharpSSH 1.1.1.13，这是地址http://www.tamirgal.com/blog/page/SharpSSH.aspx（可以自行下载）。

--需要引用的dll

using Tamir.SharpSsh;
using AmazonASNService.BLL;

class sftpHelp
    {

        private SshTransferProtocolBase m_sshCp;
        private sftpHelp()
        {

        }
        public sftpHelp(SshConnectionInfo connectionInfo)
        {
            m_sshCp = new Sftp(connectionInfo.Host, connectionInfo.User);

            if (connectionInfo.Pass != null)
            {
                m_sshCp.Password = connectionInfo.Pass;
            }

            if (connectionInfo.IdentityFile != null)
            {
                m_sshCp.AddIdentityFile(connectionInfo.IdentityFile);
            }
        }

        public bool Connected
        {
            get
            {
                return m_sshCp.Connected;
            }
        }
        public void Connect()
        {
            if (!m_sshCp.Connected)
            {
                m_sshCp.Connect();
            }
        }
        public void Close()
        {
            if (m_sshCp.Connected)
            {
                m_sshCp.Close();
            }
        }

        //上传
        public bool Upload(string localPath, string remotePath,int port)
        {
            try
            {
                if (!m_sshCp.Connected)
                {
                    m_sshCp.Connect(port);//如果没有端口号的话可以忽略
                }
                m_sshCp.Put(localPath, remotePath);

                return true;
            }
            catch
            {
                return false;
            }

        }
        //下载
        public bool Download(string remotePath, string localPath,int port)
        {
            try
            {
                if (!m_sshCp.Connected)
                {
                    m_sshCp.Connect(port);
                }

                m_sshCp.Get(remotePath, localPath);

                return true;
            }
            catch
            {
                return false;
            }
        }
        public bool Delete(string remotePath)
        {
            try
            {
                if (!m_sshCp.Connected)
                {
                    m_sshCp.Connect();
                }
                ((Sftp)m_sshCp).Delete(remotePath);//刚刚新增的Delete方法

                return true;
            }
            catch
            {
                return false;
            }
        }

        public ArrayList GetFileList(string path,int port)
        {
            try
            {
                if (!m_sshCp.Connected)
                {
                    m_sshCp.Connect(port);
                }
                return ((Sftp)m_sshCp).GetFileList(path);
            }
            catch(Exception ex)
            {
                return null;
            }
        }
    }

   /// <summary>
        /// sftp上传文件
        /// </summary>
        private static void UploadSftp()
        {
            SshConnectionInfo objInfo = new SshConnectionInfo();
            objInfo.User = ftpUserID;
            objInfo.Host = ftpServerIP;
            objInfo.Pass = ftpPassword; //基于密码
            sftpHelp objSFTPHelper = new sftpHelp(objInfo);
            string[] strFiles = Directory.GetFiles(poapath);
            if (strFiles != null)
            {
               foreach (string strFile in strFiles)
                {
                    if ( objSFTPHelper.Upload(strFile, ftpDir,2222))//开始上传
                    {
                        File.Delete(strFile);
                    }
                }
            }

        }

   /// <summary>
        /// 2.从SFTP获取文件到指定目录
        /// </summary>
        private static void DownSFTPFile() {
            SshConnectionInfo SsInfo=new SshConnectionInfo();
            SsInfo.User = ftpUserID;
            SsInfo.Host = ftpServerIP;
            //SsInfo.IdentityFile = "key"; //有2中认证，一种基于PrivateKey,一种基于password
            SsInfo.Pass = ftpPassword; //基于密码
            sftpHelp sftpDown = new sftpHelp(SsInfo);
            ArrayList FileList = sftpDown.GetFileList(ftpPath,2222);
            if (FileList != null)
            {
                for (int i = 0; i < FileList.Count; i++)
                {
                    string sfileName = ftpPath + "/" + FileList[i];
                    if (sftpDown.Download(sfileName, downPath,2222))
                    {
                        sftpDown.Delete(sfileName,2222);
                    }
                }
            }
          }