.netcore SSH

https://blog.csdn.net/abxdd2015/article/details/101139637
https://blog.csdn.net/qq_43034312/article/details/120507407

今天换了个服务器，文件上传到sftp服务器上了，那么ftp和sftp服务器有什么区别呢，正常来说sftp会更安全一些。

废话不多说，首先.net core 上传到sftp需要引入一个Nuget包，就是下图这个了。

引入之后呢，就可以直接使用了，非常的方便快捷，需要先引入

using Renci.SshNet;

这个命名空间。

然后我们前台传来的file文件通过memorystream的方式传到服务器，

  ```actionscript

///

            MemoryStream fs = new MemoryStream();
            file.CopyTo(fs);

            client.BufferSize = 4 * 1024 * 1024;
            fs.Seek(0, SeekOrigin.Begin);

            client.UploadFile(fs, "/DirkWang/" + dateStr.ToString() + "_" + file.FileName);
            fs.Dispose();
            result = true;
        }

        return result;
    }

这里要注意，上传到服务器上的目录的权限是要可读写的。然后加上时间戳防止文件重名。

然后是下载文件，下载文件更加简洁明了。

    ```actionscript
    /// <summary>
        /// 下载附件
        /// </summary>
        /// <param name="fileName">附件名</param>
        /// <returns>byte[]</returns>
        public static byte[] DownloadFile(string fileName)
        {
            byte[] buffer = new byte[2 * 1024 * 1024];
            using (var client = new SftpClient(ftpAddress, 22, ftpUser, ftpPwd)) //创建连接对象
            {
                client.Connect(); //连接

                buffer = client.ReadAllBytes("/" + fileName);
            }

            return buffer;
        }

然后这里用byte数组方便传到前台，ReadAllBytes方法的参数是文件的路径。

基本上就是那么简单，不过关于ssh.net 上传文件和下载的资料非常少，所以这里写一下，记录一下。

转载于:https://www.cnblogs.com/Ivan-Wu/p/10531262.html

        //linux服务器ip
        private static string host = Appsettings.app(new string[] { "FTPConfig", "FtpIp" });
        //linux服务器登录名
        private static string username = Appsettings.app(new string[] { "FTPConfig", "UserName" });
        //linux服务器密码
        private static string password = Appsettings.app(new string[] { "FTPConfig", "Password" });
         //linux服务器文件存放路径
        private static string UploadPath = Appsettings.app(new string[] { "FTPConfig", "UploadPath" });
        //linux服务器端口
        private static int Port = Appsettings.app(new string[] { "FTPConfig", "Port" }).CastToInt32(); 
        /// <summary>
        /// 上传文件
        /// </summary>
        /// <param name="formFile">文件流</param>
        /// <param name="Path">分类文件名称</param>
        /// <returns></returns>
        public static ReultMessage Upload(IFormFile formFile, string Path)
        {
            Stream stream = null;
            try
            {
                var Extension = Path.GetExtension(formFile.FileName).ToLower();
                if (Extension == ".docx" || Extension == ".pdf")
                {
                    var fileName = $"{formFile.FileName.Replace(Extension, "")}【{DateTime.Now.ToString("yyyyMMddhhmmss")}】{Extension}";
                    var Paths = UploadPath + Path+ "/" + DateTime.Now.ToString("yyyyMM") + "/";
                    Paths = Path.Combine(Paths);
                    stream = formFile.OpenReadStream();
                    var connectionInfo = new Renci.SshNet.ConnectionInfo(host, Port, username, new PasswordAuthenticationMethod(username, password));
                    using (var sftp = new SftpClient(connectionInfo))
                    {
                        sftp.Connect();
                        if (!sftp.Exists(Paths))
                        {
                            sftp.CreateDirectory(Paths);
                        }
                        sftp.ChangeDirectory(Paths);
                        sftp.UploadFile(stream, fileName, true);
                        sftp.Disconnect();
                        sftp.Dispose();
                    }
                    return new ReultMessage
                    {
                        code = 0,
                        message = "上传成功",
                        data = (Paths + fileName)
                    };
                }
                else
                {
                    return new ReultMessage
                    {
                        code = 1,
                        message = "文件格式不正确"
                    };
                }
            }
            catch (Exception ex)
            {
                return new ReultMessage
                {
                    code = 2,
                    message = ex.Message.ToString()
                };
            }
            finally
            {
                stream.Close();
                stream.Dispose();
            }
        }