C#的FTP上传下载的实验

前段时间做了一个FTP操作服务器文件的实验，现在把一些经验写下来，免得忘记。

1、上传的处理：目标文件夹A上传到服务器指定目录。先检索服务器目录中有无同名文件夹，若有，则先改名，上传成功后再删除，上传失败则回复文件夹名。

1)、检查文件夹是否存在

        /// <summary>

        /// 检查文件夹在服务器上是否已存在

        /// </summary>

        /// <param name="path"></param>

        /// <returns></returns>

        private static bool CheckExist(string fileName)

        {

            FtpWebRequest checkRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(_upLoadPath));

            checkRequest.Method = WebRequestMethods.Ftp.ListDirectory;

            checkRequest.UseBinary = true;

            checkRequest.Credentials = new NetworkCredential(_userName, _password);

            FtpWebResponse response = (FtpWebResponse)checkRequest.GetResponse();

            StreamReader sw = new StreamReader(response.GetResponseStream());

            List<string> files = new List<string>();

            string line = sw.ReadLine();

            while (line != null)

            {

                files.Add(line.Substring(line.IndexOf("/") + ));

                line = sw.ReadLine();

            }

            sw.Close();

            response.Close();

            return files.Contains(fileName);

        }

2)、文件夹的重命名

        /// <summary>

        /// 文件夹重命名

        /// </summary>

        /// <param name="oldName"></param>

        /// <param name="newName"></param>

        private static void RenameFolder(string oldName, string newName)

        {

            string uri = _upLoadPath + "/" + oldName;

            FtpWebRequest ftpRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));

            ftpRequest.Method = WebRequestMethods.Ftp.Rename;

            ftpRequest.UseBinary = true;

            ftpRequest.Credentials = new NetworkCredential(_userName, _password);

            ftpRequest.RenameTo = newName;

            FtpWebResponse ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();

            ftpResponse.Close();

        }

3)、文件夹的上传

        /// <summary>

        /// 上传文件夹

        /// </summary>

        /// <param name="folderInfo">待上传文件夹的信息</param>

        private static void UpLoadFolder(DirectoryInfo folderInfo)

        {

            // 服务器上文件夹的位置为根目录加上相对位置

            // rootPath = (new DirectoryInfo(_localPath)).Parent.FullName;  rootPath是待上传文件夹的目录

            string foldePath = folderInfo.FullName.Substring(rootPath.Length).Replace('\\', '/');

            string uriPath = _upLoadPath + "/" + foldePath;

            // 创建文件夹

            CreateFolder(uriPath);

            // 递归创建子文件夹并上传文件

            if (folderInfo != null)

            {

                foreach (DirectoryInfo folder in folderInfo.GetDirectories())

                {

                    UpLoadFolder(folder);

                }

                foreach (FileInfo file in folderInfo.GetFiles())

                {

                    UpLoadFile(file);

                }

            }

        }

        /// <summary>

        /// 创建文件夹

        /// </summary>

        /// <param name="folderPath">文件夹路径</param>

        private static void CreateFolder(string folderPath)

        {

            FtpWebRequest request = (FtpWebRequest)FtpWebRequest.Create(new Uri(uriPath));

            request.Method = WebRequestMethods.Ftp.MakeDirectory;

            request.UseBinary = true;

            request.Credentials = new NetworkCredential(_userName, _password);

            FtpWebResponse response = (FtpWebResponse)request.GetResponse();

            Stream ftpStream = response.GetResponseStream();

            ftpStream.Close();

            response.Close();

        }

        /// <summary>

        /// 上传单个文件

        /// </summary>

        /// <param name="file"></param>

        private static void UpLoadFile(FileInfo file)

        {

            // 服务器上文件的位置为根目录加上相对位置

            string fileName = file.FullName.Substring(rootPath.Length).Replace('\\', '/');

            string uriPath = _upLoadPath + "/" + fileName;

            FtpWebRequest request = (FtpWebRequest)FtpWebRequest.Create(new Uri(uriPath));

            request.Method = WebRequestMethods.Ftp.UploadFile;

            request.Credentials = new NetworkCredential(_userName, _password);

            FtpWebResponse upLoadResponse = (FtpWebResponse)request.GetResponse();

            Stream upLoadStream = request.GetRequestStream();

            using (FileStream fileStream = File.Open(file.FullName, FileMode.Open))

            {

                byte[] buffer = new byte[];

                int bytesRead;

                while (true)

                {

                    bytesRead = fileStream.Read(buffer, , buffer.Length);

                    if (bytesRead == )

                        break;

                    upLoadStream.Write(buffer, , bytesRead);

                }

            }

            upLoadStream.Close();

            upLoadResponse.Close();

        }

4)、文件夹的删除

        /// <summary>

        /// 删除文件夹及子文件和子文件夹

        /// </summary>

        /// <param name="folderName"></param>

        private static void DeleteFolder(string folderName)

        {

            string uri = _upLoadPath + "/" + folderName;

            FtpWebRequest searchRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));

            searchRequest.Method = WebRequestMethods.Ftp.ListDirectoryDetails;

            searchRequest.Credentials = new NetworkCredential(_userName, _password);

            FtpWebResponse searchResponse = (FtpWebResponse)searchRequest.GetResponse();

            StreamReader sw = new StreamReader(searchResponse.GetResponseStream());

            List<string> files = new List<string>();

            List<string> folders = new List<string>();

            string line = sw.ReadLine();

            while (line != null)

            {

                // windows下的文件夹读取到的数据以“d”开头，以“空格” + 文件夹名 结束

                if (line.StartsWith("d"))

                    folders.Add(line.Substring(line.LastIndexOf(" ") + ));

                else

                    files.Add(line.Substring(line.LastIndexOf(" ") + ));

                line = sw.ReadLine();

            }

            sw.Close();

            searchResponse.Close();

            // 递归删除服务器上的文件夹和文件

            foreach (string folder in folders)

            {

                DeleteFolder(folderName + "/" + folder);

            }

            foreach (string file in files)

            {

                DeleteFile(folderName + "/" + file);

            }

            FtpWebRequest deleteRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));

            deleteRequest.Method = WebRequestMethods.Ftp.RemoveDirectory;

            deleteRequest.Credentials = new NetworkCredential(_userName, _password);

            FtpWebResponse deleteResponse = (FtpWebResponse)deleteRequest.GetResponse();

            deleteResponse.Close();

        }

        /// <summary>

        /// 删除单个文件

        /// </summary>

        /// <param name="fileName"></param>

        private static void DeleteFile(string fileName)

        {

            string uri = _upLoadPath + "/" + fileName;

            FtpWebRequest deleteRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));

            deleteRequest.Method = WebRequestMethods.Ftp.DeleteFile;

            deleteRequest.Credentials = new NetworkCredential(_userName, _password);

            FtpWebResponse deleteResponse = (FtpWebResponse)deleteRequest.GetResponse();

            deleteResponse.Close();

        }

至此，上传算是完成了。一些异常处理，配置文件的格式就不贴出来了。

2)、下载，一样是重命名，下载，删除的套路。但重命名和删除是在本地，很容易实现。而FTP下载的代码也与上传代码非常镜像，递归创建子文件夹和读取写文件就好了。

总结：对于ftp服务器上文件的任何操作

1.都需要用Uri(包含IP、端口号和目录的完整路径)去实例化一个FtpWebRequest对象。

2.用FtpWebRequest对象的Method属性来选择操作文件的方式，本文出现了ListDirectory(获取子文件夹信息)、Rename、MakeDirectory(创建文件夹)、UploadFile、ListDirectoryDetails(获取子文件夹及文件信息)、RemoveDirectory、DeleteFile以及文中没有出现但下载需用到的DownloadFile。

3.连接FTP服务器XXXXRequest.Credentials = new NetworkCredential(_userName, _password)

4.得到FTP的响应对象FtpWebResponse

5.如有必要，可获得响应对象FtpWebResponse的流GetRequestStream()，并进行读写操作。

可以看到FTP各种操作的相关代码非常类似，容易看懂，功能清晰。通过这次实验，接触了FTP服务器的搭建(FileZilla Server Interface工具一路点下一步。。。)，学习了C#怎么实现FTP的上传下载，怎么用C#写windows服务以及如何调试（这个有时间、有闲心的话，也写一下，贡以后自己参考吧）。

巴特西

C#的FTP上传下载的实验

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