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        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; }#endregionpublic 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.csvuploadUrl = 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.xmlCommonDefine.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);}}}