C# 实现文件（夹）在ftp服务器间的同步【无需将文件（夹）保存到本地】

C#实现不同ftp服务器间文件（夹）同步

图1 实现不同ftp服务器间文件（夹）同步的实现思路图

　　　　/// <summary>
        /// 将文件夹1从ftp服务器1移到ftp服务器2文件夹2
        /// </summary>
        /// <param name="sFtpUriD">源ftp url：ftp://ip+port</param>
        /// <param name="sFilePathD">源ftp 文件路径:/xxx/xxx/xxx</param>
        /// <param name="sFtpUserD">源ftp用户名</param>
        /// <param name="sFtpPwdD">源ftp密码</param>
        /// <param name="sFtpUriU">目的ftp url：ftp://ip+port</param>
        /// <param name="sFilePathU">目的ftp 文件路径:/xxx/xxx/xxx</param>
        /// <param name="sFtpUserU">目的ftp用户名</param>
        /// <param name="sFtpPwdU">目的ftp密码</param>
        /// <returns></returns>
        public bool MoveFolderOnDiffFtp(string sFtpUriD, string sFolderPathD, string sFtpUserD, string sFtpPwdD,
            string sFtpUriU, string sFolderPathU, string sFtpUserU, string sFtpPwdU)
        {
            //获取文件夹中的详细文件列表信息（包括文件大小信息）
            string[] sFileNameArr = GetFileList(sFtpUriD + sFolderPathD, WebRequestMethods.Ftp.ListDirectoryDetails, sFtpUserD, sFtpPwdD);
            //判断是否为单个文件
            if (sFileNameArr.Length <= )       //文件夹中存在单文件
            {
                //在ftp服务器2上创建文件夹
                FtpCheckDirectoryExist(sFtpUriU + "/", sFolderPathU + "/", sFtpUserU, sFtpPwdU);
                if (sFileNameArr[sFileNameArr.Length - ] == "")
                {
                    string[] onlyname = GetFileList(sFtpUriD + sFolderPathD, WebRequestMethods.Ftp.ListDirectory, sFtpUserD, sFtpPwdD);
                    foreach (string onlynames in onlyname)
                    {
                        if (onlynames == "" || onlynames == " ")
                        {
                            break;
                        }
                        else
                        {
                            MoveFileOnDiffFtp(sFtpUriD, sFolderPathD + "/" + onlynames, sFtpUserD, sFtpPwdD,
                                sFtpUriU, sFolderPathU + "/" + onlynames, sFtpUserU, sFtpPwdU);
                            break;
                        }
                    }
                }
            }
            else        //文件夹中存在多文件或子文件夹
            {
                //在ftp服务器2上创建文件夹
                FtpCheckDirectoryExist(sFtpUriU + "/", sFolderPathU + "/", sFtpUserU, sFtpPwdU);
                foreach (string sFileName in sFileNameArr)
                {
                    //判断是否具有文件夹标识<DIR>
                    if (sFileName.Contains("<DIR>"))
                    {
                        string sInnerFloder = sFileName.Split(new string[] { "<DIR>" }, StringSplitOptions.None)[].Trim();
                        MoveFolderOnDiffFtp(sFtpUriD, sFolderPathD + "/" + sInnerFloder, sFtpUserD, sFtpPwdD,
                            sFtpUriU, sFolderPathU + "/" + sInnerFloder, sFtpUserU, sFtpPwdU);    //递归文件夹中的子文件夹
                    }
                    else
                    {
                        string[] onlyname = GetFileList(sFtpUriD + sFolderPathD, WebRequestMethods.Ftp.ListDirectory, sFtpUserD, sFtpPwdD);
                        foreach (string onlynames in onlyname)
                        {
                            if (onlynames == "" || onlynames == " " || sFileName == "")
                            {
                                break;
                            }
                            else
                            {
                                if (sFileName.Contains(" " + onlynames))
                                {
                                    MoveFileOnDiffFtp(sFtpUriD, sFolderPathD + "/" + onlynames, sFtpUserD, sFtpPwdD,
                                        sFtpUriU, sFolderPathU + "/" + onlynames, sFtpUserU, sFtpPwdU);
                                    break;
                                }
                            }
                        }
                    }
                }
            }
            return true;
        }
        /// <summary>
        /// 将文件从ftp服务器1移到ftp服务器2文件
        /// </summary>
        /// <param name="sFtpUriD">源ftp url：ftp://ip+port</param>
        /// <param name="sFilePathD">源ftp 文件路径:/xxx/xxx/xxx</param>
        /// <param name="sFtpUserD">源ftp用户名</param>
        /// <param name="sFtpPwdD">源ftp密码</param>
        /// <param name="sFtpUriU">目的ftp url：ftp://ip+port</param>
        /// <param name="sFilePathU">目的ftp 文件路径:/xxx/xxx/xxx</param>
        /// <param name="sFtpUserU">目的ftp用户名</param>
        /// <param name="sFtpPwdU">目的ftp密码</param>
        /// <returns></returns>
        public bool MoveFileOnDiffFtp(string sFtpUriD, string sFilePathD, string sFtpUserD, string sFtpPwdD,
            string sFtpUriU, string sFilePathU, string sFtpUserU, string sFtpPwdU)
        {
            try
            {
                //在目的ftp服务器上创建文件夹
                string sFolderPathU = sFilePathU.Substring(, sFilePathU.LastIndexOf("/"));
                FtpCheckDirectoryExist(sFtpUriU + "/", sFolderPathU + "/", sFtpUserU, sFtpPwdU);
                //1.从源ftp服务器1下载
                FtpWebRequest reqFtpDownload;
                reqFtpDownload = (FtpWebRequest)FtpWebRequest.Create(new Uri(sFtpUriD + sFilePathD));
                reqFtpDownload.Credentials = new NetworkCredential(sFtpUserD, sFtpPwdD);
                reqFtpDownload.Method = WebRequestMethods.Ftp.DownloadFile; //下载方法
                reqFtpDownload.KeepAlive = false;
                reqFtpDownload.UseBinary = true;
                reqFtpDownload.Proxy = null;
                FtpWebResponse response = (FtpWebResponse)reqFtpDownload.GetResponse();
                //将从服务器1下载的响应流直接作为上传到服务器2的上传流
                Stream stream = response.GetResponseStream();
                //2.上传到目的ftp服务器2
                FtpWebRequest reqFTPUpload;
                reqFTPUpload = (FtpWebRequest)FtpWebRequest.Create(new Uri(sFtpUriU + sFilePathU));
                reqFTPUpload.Credentials = new NetworkCredential(sFtpUserU, sFtpPwdU);
                reqFTPUpload.Method = WebRequestMethods.Ftp.UploadFile; //上传方法
                reqFTPUpload.KeepAlive = false;
                reqFTPUpload.UseBinary = true;
                reqFTPUpload.Proxy = null;
                int buffLength = ;  //每次读入文件流2kb
                byte[] buff = new byte[buffLength];
                Stream requestStream = reqFTPUpload.GetRequestStream();
                int len = stream.Read(buff, , buff.Length);  //文件大小
                while (len > )
                {
                    requestStream.Write(buff, , len);
                    len = stream.Read(buff, , buffLength);
                }
                stream.Close();
                requestStream.Close();
                stream.Dispose();//释放资源
                requestStream.Dispose();//释放资源return true;
            }
            catch (Exception ex)
            {
　　　　　　　　　return false;
            }
        }
        /// <summary>
        /// 获取ftp上文件夹中的文件（夹）列表信息
        /// </summary>
        /// <param name="sFloderPath">ftp路径</param>
        /// <param name="type">获取列表的类型（详细或只有文件名）</param>
        /// <param name="sFtpUser">ftp用户名</param>
        /// <param name="sFtpPwd">ftp密码</param>
        /// <returns></returns>
        private string[] GetFileList(string sFloderPath, string type ,string sFtpUser,string sFtpPwd)
        {
            WebResponse webresp = null;
            StreamReader ftpFileListReader = null;
            FtpWebRequest ftpRequest = null;
            StringBuilder str = new StringBuilder();
            try
            {
                ftpRequest = (FtpWebRequest)WebRequest.Create(new Uri(sFloderPath));
                ftpRequest.Credentials = new NetworkCredential(sFtpUser, sFtpPwd);
                ftpRequest.Method = type;
                webresp = ftpRequest.GetResponse();
                ftpFileListReader = new StreamReader(webresp.GetResponseStream(), Encoding.UTF8);
                string line = ftpFileListReader.ReadLine();
                while (line != null)
                {
                    str.Append(line);
                    str.Append("/n");
                    line = ftpFileListReader.ReadLine();
                }
            }
            catch (Exception ex)
            {}
            return str.ToString().Split(new string[] { "/n" }, StringSplitOptions.None);
        }
        /// <summary>
        /// 判断文件的目录是否存,不存则创建
        /// </summary>
        /// <param name="destFilePath"></param>
        private static void FtpCheckDirectoryExist(string strFtpURI, string destFilePath, string strFtpUserID, string strFtpPassword)
        {
            string fullDir = destFilePath.Substring(, destFilePath.LastIndexOf("/"));
            string[] dirs = fullDir.Split('/');
            string curDir = "";
            for (int i = ; i < dirs.Length; i++)
            {
                string dir = dirs[i];
                //如果是以/开始的路径,第一个为空
                if (dir != null && dir.Length > )
                {
                    try
                    {
                        curDir += dir + "/";
                        FtpMakeDir(strFtpURI, curDir, strFtpUserID, strFtpPassword);
                    }
                    catch (Exception)
                    {}
                }
            }
        }
        /// <summary>
        /// 创建ftp目录
        /// </summary>
        private static Boolean FtpMakeDir(string strFtpURI, string destFilePath, string strFtpUserID, string strFtpPassword)
        {
            FtpWebRequest req = (FtpWebRequest)WebRequest.Create(strFtpURI + destFilePath);
            req.Credentials = new NetworkCredential(strFtpUserID, strFtpPassword);
            req.Proxy = null;
            req.KeepAlive = false;
            req.Method = WebRequestMethods.Ftp.MakeDirectory;//请求方法为创建目录方法
            req.UseBinary = true;
            FtpWebResponse response = req.GetResponse() as FtpWebResponse;
            Stream ftpStream = response.GetResponseStream();
            ftpStream.Close();
            response.Close();
            req.Abort();
            return true;
        }    

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