C#使用FluentFTP以及ICSharpCode.SharpZipLib進行FTP文件的壓縮和備份

FluentFTP，用於FTP的連接；

ICSharpCode.SharpZipLib，用於文件壓縮；

以上都是開源的第三方控件，可直接在nuget中獲取。

具體的代碼示例如下，大家可以根據自己的實際情況進行參考修改：

using System;
using FluentFTP;
using ICSharpCode.SharpZipLib.Zip;
using System.Net;

namespace FTP_Data_Backup
{
    class Program
    {
        static string strTempFolder = @"W:\TempData\";
        static void Main(string[] args)
        {


            string FTPHost_Source = "10.0.0.2"; //原路徑FTP地址
            string FTPUsername_Source = "user";
            string FTPPassword_Source = "password";
            string FTPDirectory_Source = "/source_directory";

            string FTPHost_Backup = "10.0.0.3"; //備份FTP地址
            string FTPUsername_Backup = "user";
            string FTPPassword_Backup = "password";
            string FTPDirectory_Backup = "/bk_directory";

            AppendLog("程序開始運行---------------------------------------------------------");
            //return;
            Console.WriteLine("");
            FtpClient client = new FtpClient(FTPHost_Source);
            client.Credentials = new NetworkCredential(FTPUsername_Source, FTPPassword_Source);
            client.Connect();
            AppendLog("Source服務器連接成功。");

            FtpClient client_bk = new FtpClient(FTPHost_Backup);
            client_bk.Credentials = new NetworkCredential(FTPUsername_Backup, FTPPassword_Backup);
            client_bk.Connect();
            AppendLog("Backup服務器連接成功。");

            //第一層文件夾
            foreach (FtpListItem item1 in client.GetListing(FTPDirectory_Source))
            {
                // if this is a file
                if (item1.Type != FtpFileSystemObjectType.Directory)
                {
                    continue;
                }
                //第二層文件夾
                foreach (FtpListItem item2 in client.GetListing(item1.FullName))
                {
                    // if this is a file
                    if (item2.Type != FtpFileSystemObjectType.Directory)
                    {
                        continue;
                    }
                    //第三層文件夾
                    foreach (FtpListItem item3 in client.GetListing(item2.FullName))
                    {
                        // if this is a file
                        if (item3.Type != FtpFileSystemObjectType.Directory)
                        {
                            if (item3.Type == FtpFileSystemObjectType.File)
                            {
                                //第三層已經是壓縮過的文件，直接備份過去。其他文件需要是3個月前的數據才轉移
                                if (item3.Modified < DateTime.Now.AddMonths(-3) || System.IO.Path.GetExtension(item3.Name).ToLower() == ".zip")
                                {
                                    //只備份3個月前的數據
                                    string strFTPBackupPath = CheckSlash_FTP(FTPDirectory_Backup)
                                    + item1.Name + "/" + item2.Name + "/";
                                    DownloadAndBackup(client, client_bk, item3, strFTPBackupPath);
                                }

                                continue;
                            }
                            else
                            {
                                continue;
                            }
                        }
                        foreach (FtpListItem item4 in client.GetListing(item3.FullName)) //item4,具體的文件,最後一層
                        {
                            // if this is a file
                            if (item4.Type != FtpFileSystemObjectType.Directory)
                            {
                                if (item4.Modified >= DateTime.Now.AddMonths(-3))
                                {
                                    //只備份3個月前的數據
                                    continue;
                                }
                                string strFTPBackupPath = CheckSlash_FTP(FTPDirectory_Backup)
                                    + item1.Name + "/" + item2.Name + "/"
                                    + item3.Name + "/";
                                DownloadAndBackup(client, client_bk, item4, strFTPBackupPath);
                            }
                        }
                        //如果//第三層文件夾是空，則刪除該文件夾
                        if (client.GetListing(item3.FullName).Length == 0)
                        {
                            client.DeleteDirectory(item3.FullName);
                            AppendLog("刪除了空目錄" + item3.FullName);
                        }
                    }
                    //如果第二層文件夾是空，則刪除該文件夾
                    if (client.GetListing(item2.FullName).Length == 0)
                    {
                        client.DeleteDirectory(item2.FullName);
                        AppendLog("刪除了空目錄" + item2.FullName);
                    }
                }
                //如果Customer文件夾是空，則刪除該文件夾
                if (client.GetListing(item1.FullName).Length == 0)
                {
                    client.DeleteDirectory(item1.FullName);
                    AppendLog("刪除了空目錄" + item1.FullName);
                }
            }

            // disconnect! good bye!
            client.Disconnect();
            AppendLog("關閉了EDS服務器連接。");
            client_bk.Disconnect();
            AppendLog("關閉了EDS_BK服務器連接。");
        }

        private static void DownloadAndBackup(FtpClient client, FtpClient client_bk, FtpListItem item, string strFTPBackupPath)
        {
            if (!System.IO.Directory.Exists(strTempFolder))
            {
                System.IO.Directory.CreateDirectory(strTempFolder);
            }
            string strLoaclFileName = CheckSlash(strTempFolder) + item.Name;
            string strLoaclZIPName = strLoaclFileName + ".zip";
            //下載文件
            AppendLog("開始下載文件" + item.FullName);
            if (client.DownloadFile(strLoaclFileName, item.FullName, true))
            {
                AppendLog("下載成功。");
                //壓縮
                AppendLog("開始壓縮...");
                if (System.IO.Path.GetExtension(strLoaclFileName).ToLower() == ".zip")
                {
                    //如果文件名本來就是.zip，則不需要再壓縮
                    strLoaclZIPName = strLoaclFileName;
                }
                else
                {
                    ZipFile zip = ZipFile.Create(strLoaclZIPName);
                    zip.BeginUpdate();
                    zip.Add(strLoaclFileName, item.Name);
                    zip.CommitUpdate();
                    zip.Close();
                    AppendLog("壓縮成功。");
                    System.IO.File.Delete(strLoaclFileName);
                    AppendLog("刪除本地文件成功。");
                }
                //上傳到備份FTP

                string strFTPBackupFileName = CheckSlash_FTP(strFTPBackupPath) + System.IO.Path.GetFileName(strLoaclZIPName);

                if (client_bk.FileExists(strFTPBackupFileName))
                {
                    string strFTPBackupFileName_Rename = CheckSlash_FTP(System.IO.Path.GetDirectoryName(strFTPBackupFileName)) + System.IO.Path.GetFileNameWithoutExtension(strFTPBackupFileName) + "_" + DateTime.Now.ToString("yyyyMMddHHmmss") + System.IO.Path.GetExtension(strFTPBackupFileName);
                    client_bk.Rename(strFTPBackupFileName, strFTPBackupFileName_Rename);
                    AppendLog("已經重命名backup服務器上的文件到" + strFTPBackupFileName_Rename);
                }
                AppendLog("開始上傳到backup...");
                if (client_bk.UploadFile(strLoaclZIPName, strFTPBackupFileName, FtpExists.Skip, true))
                {
                    AppendLog("上傳到backup成功。");
                    System.IO.File.Delete(strLoaclZIPName);
                    AppendLog("刪除本地壓縮文件成功。");
                    client.DeleteFile(item.FullName);
                    AppendLog("刪除源FTP文件成功。");
                }
                else
                {
                    AppendLog("上傳失敗！");
                }
            }
            else
            {
                AppendLog("下載失敗！");
            }
        }
        private static string CheckSlash(string path)
        {
            if (path.EndsWith("\\"))
            {
                return path;
            }
            else
            {
                return path + "\\";
            }
        }

        private static string CheckSlash_FTP(string path)
        {
            if (path.EndsWith("/"))
            {
                return path;
            }
            else
            {
                return path + "/";
            }
        }

        public static void AppendLog(string message)
        {
            string str_log_path = CheckSlash(AppDomain.CurrentDomain.BaseDirectory) + "Log\\";
            Console.WriteLine(message);
            if (!System.IO.Directory.Exists(str_log_path))
            {
                System.IO.Directory.CreateDirectory(str_log_path);
            }
            System.IO.FileStream fs = new System.IO.FileStream(str_log_path + DateTime.Now.ToString("yyyy_MM_dd") + ".log", System.IO.FileMode.Append);
            System.IO.StreamWriter sw = new System.IO.StreamWriter(fs, System.Text.Encoding.GetEncoding(936));
            sw.WriteLine(DateTime.Now.ToString("MM_dd HH:mm") + " | " + message);
            sw.Close();
            sw.Dispose();
            fs.Close();
            fs.Dispose();
        }
    }
}