C# ftp帮助类 项目实战优化版

    上位机开发中有时要与客户的文件服务器进行数据交互。如Mapping文件下载。结果文件上传等。我在项目中就常用到。现在把项目实战代码进行分享一下。
    功能列表：连接服务器，下载文件，上传文件，删除服务器文件，获取当前目录下明细(包含文件和文件夹)  ，获取FTP文件列表(包括文件夹)，获取当前目录下文件列表(不包括文件夹)  ，创建文件夹，获取指定文件大小  ，更改文件名，移动文件  ，删除ftpURI目录下指定的文件夹

调用

    1.初始化连接
    CommonData.FtpServer_MappingFile = new FTPHelper(ftpIPAddress, ftpUser, ftpPw);
    2.下载
    //url 服务器下载地址
    //savefilePath 保存文件目录
    //fileName 文件名，只是文件名
    CommonData.FtpServer_MappingFile.DownloadByUrl(url, savefilePath, fileName, true);
    3.上传
    //currentDirectory 本地文件完整路径包括文件名
    //ftpUploadFileName FTP服务器完整上传路径包括文件名
    CommonData.FtpServer_MappingFile.Upload(currentDirectory, ftpUploadFileName);

代码

/// <summary>
    /// ftp帮助类
    /// </summary>
    public class FTPHelper
    {
        #region 字段
        string ftpURI;
        string ftpUserID;
        string ftpServerIP;
        string ftpPassword;
        string ftpRemotePath;
        /// <summary>
        /// 下载URL
        /// </summary>
        public string DownloadUrl { get; set; }
        #endregion
        public string GetFtpURI()
        {
            return ftpURI;
        }
        //public FTPHelper() { }
        /// <summary>  
        /// 连接FTP服务器
        /// </summary>  
        /// <param name="FtpServerIP">FTP连接地址</param>  
        /// <param name="FtpRemotePath">指定FTP连接成功后的当前目录, 如果不指定即默认为根目录</param>  
        /// <param name="FtpUserID">用户名</param>  
        /// <param name="FtpPassword">密码</param>  
        public FTPHelper(string FtpServerIP, string FtpRemotePath, string FtpUserID, string FtpPassword, bool isFile = false)
        {
            ftpServerIP = FtpServerIP;
            ftpRemotePath = FtpRemotePath;
            ftpUserID = FtpUserID;
            ftpPassword = FtpPassword;
            //ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/";
            ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/";
            if (isFile)
            {
                ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath.Replace("\\", "/");
            }
        }
        /// <summary>  
        /// 连接FTP服务器
        /// </summary>  
        /// <param name="FtpServerIP">FTP连接地址</param>  
        /// <param name="FtpRemotePath">指定FTP连接成功后的当前目录, 如果不指定即默认为根目录</param>  
        /// <param name="FtpUserID">用户名</param>  
        /// <param name="FtpPassword">密码</param>  
        public FTPHelper(string FtpServerIP, string FtpUserID, string FtpPassword)
        {
            ftpServerIP = FtpServerIP;
            //ftpRemotePath = FtpRemotePath;
            ftpUserID = FtpUserID;
            ftpPassword = FtpPassword;
            //ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/";
            ftpURI = "ftp://" + ftpServerIP;//+ "/" + ftpRemotePath + "/";
            //if (isFile)
            //{
            //    ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath.Replace("\\", "/");
            //}
        }
        /// <summary>  
        /// 上传  filename是本地图片的地址
        /// </summary>   
        public void Upload(string filename)
        {
            FileInfo fileInf = new FileInfo(filename);
            FtpWebRequest reqFTP;
            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileInf.Name));
            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
            reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
            reqFTP.KeepAlive = false;
            reqFTP.UseBinary = true;
            reqFTP.ContentLength = fileInf.Length;
            int buffLength = 2048;
            byte[] buff = new byte[buffLength];
            int contentLen;
            FileStream fs = fileInf.OpenRead();
            try
            {
                Stream strm = reqFTP.GetRequestStream();
                contentLen = fs.Read(buff, 0, buffLength);
                while (contentLen != 0)
                {
                    strm.Write(buff, 0, contentLen);
                    contentLen = fs.Read(buff, 0, buffLength);
                }
                strm.Close();
                fs.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }
        /// <summary>
        /// 上传
        /// </summary>
        /// <param name="fileName">是本地文件全路径</param>
        /// <param name="ftpUrl"></param>
        /// <param name="lmDir"></param>
        /// <returns></returns>
        public CommonResultModel<string> Upload(string fileName, string ftpUrl)
        {
            var resultModel = new CommonResultModel<string>();
            FileInfo fileInf = null;
            FtpWebRequest reqFTP;
            Stream strm = null;
            FileStream fs = null;
            var uploadUrl = string.Empty;
            try
            {
                //ip/指定目录/lotId/pid.csv
                uploadUrl = ftpURI + ftpUrl;
                resultModel.Data = uploadUrl;
                //var ftpDir = uploadUrl.Replace(lmDir, string.Empty);
                var ftpDirList = ftpUrl.Split('/').ToList();
                ftpDirList = ftpDirList.FindAll(t => t.Length > 0).FindAll(t => !t.Contains("."));
                var newDir = ftpURI;
                //判断文件夹是否存在
                //resultModel.Msg = "Upload 判断文件夹是否存在 ";
                //CommonDefine.SaveWorkLogs(resultModel.Msg);
                foreach (var item in ftpDirList)
                {
                    //newDir += "/" + item;
                    var isExists = FolderExists(newDir, item);
                    newDir += "/" + item;
                    //resultModel.Msg += "newDir:" + newDir + ",isExists:" + isExists + ",";
                    //CommonDefine.SaveWorkLogs(resultModel.Msg);
                    if (!isExists)
                    {
                        var makeDirResultModel = MakeDir(newDir);
                        //CommonDefine.SaveWorkLogs(resultModel.Msg
                        //    + ", MakeDir: IsSucceed=" + makeDirResultModel.IsSucceed + ",msg:" + makeDirResultModel.Msg);
                        //if (!makeDirResultModel.IsSucceed)
                        //{
                        //    throw new Exception(makeDirResultModel.Msg);
                        //}
                    }
                }
                fileInf = new FileInfo(fileName);
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uploadUrl));
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
                reqFTP.KeepAlive = false;
                reqFTP.UseBinary = true;
                reqFTP.ContentLength = fileInf.Length;
                int buffLength = 2048;
                byte[] buff = new byte[buffLength];
                int contentLen;
                fs = fileInf.OpenRead();
                strm = reqFTP.GetRequestStream();
                contentLen = fs.Read(buff, 0, buffLength);
                while (contentLen != 0)
                {
                    strm.Write(buff, 0, contentLen);
                    contentLen = fs.Read(buff, 0, buffLength);
                }
            }
            catch (Exception ex)
            {
                //throw new Exception("uploadUrl:" + uploadUrl + ",Message:" + ex.Message);
                resultModel.Msg = "异常:" + ex.Message;
            }
            finally
            {
                if (strm != null)
                {
                    strm.Close();
                }
                if (fs != null)
                {
                    fs.Close();
                }
            }
            return resultModel;
        }
        /// <summary>  
        /// 下载  filePath是下载到本机的地址fileName是需要下载的文件的名字
        /// </summary>   
        public void Download(string filePath, string fileName, bool isFile = false)
        {
            try
            {
                FileStream outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create);
                FtpWebRequest reqFTP;
                if (isFile)
                {
                    reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI));
                }
                else
                {
                    reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileName));
                }
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
                reqFTP.UseBinary = true;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                long cl = response.ContentLength;
                int bufferSize = 2048;
                int readCount;
                byte[] buffer = new byte[bufferSize];
                readCount = ftpStream.Read(buffer, 0, bufferSize);
                while (readCount > 0)
                {
                    outputStream.Write(buffer, 0, readCount);
                    readCount = ftpStream.Read(buffer, 0, bufferSize);
                }
                ftpStream.Close();
                outputStream.Close();
                response.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }
        /// <summary>
        /// 下载  filePath是下载到本机的地址fileName是需要下载的文件的名字
        /// </summary>
        /// <param name="ftpFilePath">FTP下载文件的路径（/mapping/xxx）</param>
        /// <param name="savefilePath">本地保存文件路径</param>
        /// <param name="savefileName">本地保存文件</param>
        /// <param name="isFile">是否是文件</param>
        public void DownloadByUrl(string ftpFilePath, string savefilePath, string savefileName, bool isFile = false)
        {
            try
            {
                FileStream outputStream = new FileStream(savefilePath + "\\" + savefileName, FileMode.Create);
                FtpWebRequest reqFTP;
                ftpFilePath = ftpFilePath.Replace("\\", "/");
                if (isFile)
                {
                    //DownloadUrl = ftpURI;
                    DownloadUrl = ftpURI + ftpFilePath;
                    reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(DownloadUrl));
                }
                else
                {
                    //var url = ftpURI + "//" + ftpFilePath.Trim().TrimStart('\\').TrimStart('/');
                    DownloadUrl = ftpURI + ftpFilePath;
                    reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(DownloadUrl));
                }
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
                reqFTP.UseBinary = true;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                long cl = response.ContentLength;
                int bufferSize = 2048;
                int readCount;
                byte[] buffer = new byte[bufferSize];
                readCount = ftpStream.Read(buffer, 0, bufferSize);
                while (readCount > 0)
                {
                    outputStream.Write(buffer, 0, readCount);
                    readCount = ftpStream.Read(buffer, 0, bufferSize);
                }
                ftpStream.Close();
                outputStream.Close();
                response.Close();
            }
            catch (Exception ex)
            {
                throw new Exception("DownloadUrl:" + DownloadUrl + ", errorMsg:" + ex.Message);
            }
        }
        /// <summary>  
        /// 删除服务器的文件  fileName是需要删除的文件的名字
        /// </summary>  
        public void Delete(string fileName)
        {
            try
            {
                FtpWebRequest reqFTP;
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileName));
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                reqFTP.Method = WebRequestMethods.Ftp.DeleteFile;
                reqFTP.KeepAlive = false;
                string result = String.Empty;
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                long size = response.ContentLength;
                Stream datastream = response.GetResponseStream();
                StreamReader sr = new StreamReader(datastream);
                result = sr.ReadToEnd();
                sr.Close();
                datastream.Close();
                response.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }
        /// <summary>  
        /// 获取当前目录下明细(包含文件和文件夹)  
        /// </summary>  
        public string[] GetFilesDetailList()
        {
            try
            {
                StringBuilder result = new StringBuilder();
                FtpWebRequest ftp;
                ftp = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI));
                ftp.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                ftp.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
                WebResponse response = ftp.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream());
                string line = reader.ReadLine();
                line = reader.ReadLine();
                line = reader.ReadLine();
                while (line != null)
                {
                    result.Append(line);
                    result.Append("\n");
                    line = reader.ReadLine();
                }
                result.Remove(result.ToString().LastIndexOf("\n"), 1);
                reader.Close();
                response.Close();
                return result.ToString().Split('\n');
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }
        /// <summary>  
        /// 获取FTP文件列表(包括文件夹)
        /// </summary>   
        private List<string> GetAllList(string url)
        {
            List<string> list = new List<string>();
            FtpWebRequest req = (FtpWebRequest)WebRequest.Create(new Uri(url));
            req.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
            req.Method = WebRequestMethods.Ftp.ListDirectory;
            req.UseBinary = true;
            req.UsePassive = true;
            try
            {
                using (FtpWebResponse res = (FtpWebResponse)req.GetResponse())
                {
                    using (StreamReader sr = new StreamReader(res.GetResponseStream()))
                    {
                        string s;
                        while ((s = sr.ReadLine()) != null)
                        {
                            list.Add(s);
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                throw (ex);
            }
            return list;
        }
        /// <summary>  
        /// 获取当前目录下文件列表(不包括文件夹)  
        /// </summary>  
        public List<string> GetFileList(string url)
        {
            var fileNameList = new List<string>();
            //StringBuilder result = new StringBuilder();
            FtpWebRequest reqFTP;
            try
            {
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
                WebResponse response = reqFTP.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream());
                string line = reader.ReadLine();
                while (line != null)
                {
                    //rwxrwxr--    1 1001     1001         4520 Oct 31  2023 AD2300225P1.xml
                    CommonDefine.SaveWorkLogs("GetFileList() " + line);
                    //if (line.IndexOf("<DIR>") == -1)
                    //{
                    //    var fileName = Regex.Match(line, @"[\S]+ [\S]+", RegexOptions.IgnoreCase).Value.Split(' ')[1];
                    //    CommonDefine.SaveWorkLogs("GetFileList()1 fileName:" + fileName);
                    //    result.Append(fileName);
                    //    result.Append("\n");
                    //}
                    var textList = line.Split(' ').ToList();
                    var fileName = textList.LastOrDefault();
                    //result.Append(fileName);
                    fileNameList.Add(fileName);
                    line = reader.ReadLine();
                }
                //result.Remove(result.ToString().LastIndexOf('\n'), 1);
                reader.Close();
                response.Close();
            }
            catch (Exception ex)
            {
                //throw (ex);
                throw new Exception(ex.Message + ",url:" + url + ",ftpUserID:" + ftpUserID + ",ftpPassword:" + ftpPassword);
            }
            //return result.ToString().Split('\n');
            return fileNameList;
        }
        /// <summary>  
        /// 获取当前目录下文件列表(不包括文件夹)  
        /// </summary>  
        public List<string> GetFileListByFilePath(string filePath)
        {
            var fileList = new List<string>();
            //var url = ftpURI + "//" + filePath.Trim().TrimStart('\\').TrimStart('/');
            var url = ftpURI + filePath.Trim();
            try
            {
                //var fileNameArray = GetFileList(ftpURI + "//" + filePath);
                var fileNameArray = GetFileList(url);
                if (fileNameArray != null && fileNameArray.Count > 0)
                {
                    fileList = fileNameArray;
                }
            }
            catch (Exception ex)
            {
                //throw (ex);
                throw new Exception("url:" + url + ",errormsg:" + ex.Message);
            }
            return fileList;
        }
        /// <summary>  
        /// 判断当前目录下指定的文件是否存在  
        /// </summary>  
        /// <param name="RemoteFileName">远程文件名</param>  
        public bool FileExist(string RemoteFileName)
        {
            var fileList = GetFileList("*.*");
            foreach (string str in fileList)
            {
                if (str.Trim() == RemoteFileName.Trim())
                {
                    return true;
                }
            }
            return false;
        }
        /// <summary>  
        /// 创建文件夹  
        /// </summary>   
        public CommonResultModel<string> MakeDir(string ftpDirName)
        {
            var resultModel = new CommonResultModel<string>();
            FtpWebRequest reqFTP;
            FtpWebResponse response = null;
            try
            {
                //resultModel.Msg = "MakeDir 1";
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpDirName));
                //resultModel.Msg = "MakeDir 2";
                reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;//创建文件夹
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                //resultModel.Msg = "MakeDir 3";
                using (response = (FtpWebResponse)reqFTP.GetResponse())
                {
                    //resultModel.Msg = "MakeDir 4";
                    Stream ftpStream = response.GetResponseStream();
                    //resultModel.Msg = "MakeDir 5";
                    ftpStream.Close();
                    resultModel.IsSucceed = true;
                }
                //response.Close();
            }
            catch (Exception ex)
            {
                //resultModel.Msg = ex.Message;
                throw ex;
            }
            finally
            {
                if (response != null)
                {
                    response.Close();
                }
            }
            return resultModel;
        }
        
        /// <summary>
        /// 判断文件夹是否存在
        /// </summary>
        /// <param name="ftpServer"></param>
        /// <param name="ftpFolder">文件夹</param>
        /// <param name="ftpUsername"></param>
        /// <param name="ftpPassword"></param>
        /// <returns></returns>
        public bool FolderExists(string ftpFolder, string findFolder)
        {
            bool folderExists = false;
            string uploadUrl = string.Empty;
            try
            {
                var fileNameList = CommonData.FtpServer_MappingFile.GetAllList(ftpFolder.Trim());
                foreach (var item in fileNameList)
                {
                    //this.lbFtpFileNames.Items.Add(item);
                    //CommonDefine.SaveWorkLogs("判断文件夹是否存在 获取FTP所有文件 " + ftpFolder + "：" + item);
                    if (item.Contains(findFolder))
                    {
                        folderExists = true;
                        //CommonDefine.SaveWorkLogs("判断文件夹是否存在 获取FTP所有文件 " + ftpFolder + "：" + item + "," + findFolder + "目录存在");
                        break;
                    }
                }
            }
            catch (WebException ex)
            {
                var response = (FtpWebResponse)ex.Response;
                if (response.StatusCode == FtpStatusCode.ActionNotTakenFileUnavailable)
                {
                    folderExists = false;
                }
                else
                {
                    // 处理其他异常
                }
            }
            return folderExists;
        }
        /// <summary>  
        /// 获取指定文件大小  
        /// </summary>  
        public long GetFileSize(string filename)
        {
            FtpWebRequest reqFTP;
            long fileSize = 0;
            try
            {
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + filename));
                reqFTP.Method = WebRequestMethods.Ftp.GetFileSize;
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                fileSize = response.ContentLength;
                ftpStream.Close();
                response.Close();
            }
            catch (Exception ex)
            { }
            return fileSize;
        }
        /// <summary>  
        /// 更改文件名  
        /// </summary> 
        public void ReName(string currentFilename, string newFilename)
        {
            FtpWebRequest reqFTP;
            try
            {
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + currentFilename));
                reqFTP.Method = WebRequestMethods.Ftp.Rename;
                reqFTP.RenameTo = newFilename;
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                ftpStream.Close();
                response.Close();
            }
            catch (Exception ex)
            { }
        }
        /// <summary>  
        /// 移动文件  
        /// </summary>  
        public void MovieFile(string currentFilename, string newDirectory)
        {
            ReName(currentFilename, newDirectory);
        }
        /// <summary>  
        /// 切换当前目录  
        /// </summary>  
        /// <param name="IsRoot">true:绝对路径 false:相对路径</param>   
        public void GotoDirectory(string DirectoryName, bool IsRoot)
        {
            if (IsRoot)
            {
                ftpRemotePath = DirectoryName;
            }
            else
            {
                ftpRemotePath += DirectoryName + "/";
            }
            ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/";
        }
        /// <summary>  
        /// 删除ftpURI目录下指定的文件夹  
        /// </summary>   
        public void DeleteDir(string dirName)
        {
            FtpWebRequest reqFTP;
            try
            {
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + dirName));
                reqFTP.Method = WebRequestMethods.Ftp.RemoveDirectory;
                reqFTP.UseBinary = true;
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
                Stream ftpStream = response.GetResponseStream();
                ftpStream.Close();
                response.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }
    }