sudo apt-get install vsftpd

编辑vsftp的配置文件，保险起见在配置之前先将配置文件备份

cp etc/vsftpd.conf /home/xxx/Desktop/vsdtpd.conf.back
sudo vim vsftpd.conf

#禁止匿名访问
anonymous_enable=NO
#接受本地用户
local_enable=YES
#允许上传
write_enable=YES
#用户只能访问限制的目录
chroot_local_user=YES
#设置固定目录，在结尾添加。如果不添加这一行，各用户对应自己的目录，当然这个文件夹自己建
local_root=/home/ftp

重启ftp

sudo service vsftpd restart

sudo useradd -d /home/ftp -M ftp

sudo password ftp

参考：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Globalization;
using System.Windows.Forms;
using System.Net;
using System.IO;namespace exam4
{class FTPlib{public class FtpWeb{string ftpServerIP;string ftpRemotePath;string ftpUserID;string ftpPassword;string ftpURI;public String FtpURI{get {return ftpURI;}//不留set属性}/// <summary>/// 连接FTP/// </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 FtpWeb(string FtpServerIP, string FtpRemotePath, string FtpUserID, string FtpPassword){ftpServerIP = FtpServerIP;ftpRemotePath = FtpRemotePath;ftpUserID = FtpUserID;ftpPassword = FtpPassword;ftpURI = ftpServerIP + "/" /*+ ftpRemotePath + "/"*/;}/// <summary>/// 上传/// </summary>/// <param name="filename"></param>public void Upload(string filename){FileInfo fileInf = new FileInfo(filename);string uri = ftpURI + fileInf.Name;FtpWebRequest reqFTP;reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);reqFTP.KeepAlive = false;reqFTP.Method = WebRequestMethods.Ftp.UploadFile;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){Insert_Standard_ErrorLog.Insert("FtpWeb", "Upload Error --> " + ex.Message);}}/// <summary>/// 下载/// </summary>/// <param name="filePath"></param>/// <param name="fileName"></param>public void Download(string filePath, String path, string fileName){FtpWebRequest reqFTP;try{FileStream outputStream = new FileStream(filePath + "" + fileName, FileMode.Create);reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + path));reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;reqFTP.UseBinary = true;reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);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){Insert_Standard_ErrorLog.Insert("FtpWeb", "Download Error --> " + ex.Message);}}/// <summary>/// 删除文件/// </summary>/// <param name="fileName"></param>public void Delete(string fileName){try{string uri = ftpURI + fileName;FtpWebRequest reqFTP;reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);reqFTP.KeepAlive = false;reqFTP.Method = WebRequestMethods.Ftp.DeleteFile;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){Insert_Standard_ErrorLog.Insert("FtpWeb", "Delete Error --> " + ex.Message + "  文件名:" + fileName);}}/// <summary>/// 删除文件夹/// </summary>/// <param name="folderName"></param>public void RemoveDirectory(string folderName){try{string uri = ftpURI + folderName;FtpWebRequest reqFTP;reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);reqFTP.KeepAlive = false;reqFTP.Method = WebRequestMethods.Ftp.RemoveDirectory;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){Insert_Standard_ErrorLog.Insert("FtpWeb", "Delete Error --> " + ex.Message + "  文件名:" + folderName);}}/// <summary>/// 获取当前目录下明细(包含文件和文件夹)/// </summary>/// <returns></returns>public string[] GetFilesDetailList(String filename){string[] downloadFiles;try{StringBuilder result = new StringBuilder();FtpWebRequest ftp;ftp = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI+filename));ftp.Credentials = new NetworkCredential(ftpUserID, ftpPassword);ftp.Method = WebRequestMethods.Ftp.ListDirectoryDetails;WebResponse response = ftp.GetResponse();StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.Default);//while (reader.Read() > 0)//{//}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){downloadFiles = null;//MessageBox.Show("连接FTP获取根目录下文件列表出错了", "ERROR", MessageBoxButtons.OK,// MessageBoxIcon.Error);Insert_Standard_ErrorLog.Insert("FtpWeb", "GetFilesDetailList Error --> " + ex.Message);return downloadFiles;}}/// <summary>/// 获取当前目录下文件列表(仅文件)/// </summary>/// <returns></returns>public string[] GetFileList(string mask){string[] downloadFiles;StringBuilder result = new StringBuilder();FtpWebRequest reqFTP;try{reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI));reqFTP.UseBinary = true;reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);reqFTP.Method = WebRequestMethods.Ftp.ListDirectory;WebResponse response = reqFTP.GetResponse();StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.Default);string line = reader.ReadLine();while (line != null){if (mask.Trim() != string.Empty && mask.Trim() != "*.*"){string mask_ = mask.Substring(0, mask.IndexOf("*"));if (line.Substring(0, mask_.Length) == mask_){result.Append(line);result.Append("\n");}}else{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){downloadFiles = null;if (ex.Message.Trim() != "远程服务器返回错误: (550) 文件不可用(例如，未找到文件，无法访问文件)。"){Insert_Standard_ErrorLog.Insert("FtpWeb", "GetFileList Error --> " + ex.Message.ToString());}return downloadFiles;}}/// <summary>/// 获取当前目录下所有的文件夹列表(仅文件夹)/// </summary>/// <returns></returns>public string[] GetDirectoryList(String filename){string[] drectory = GetFilesDetailList(filename);string m = string.Empty;foreach (string str in drectory){int dirPos = str.IndexOf("<DIR>");if (dirPos > 0){/*判断 Windows 风格*/m += str.Substring(dirPos + 5).Trim() + "\n";}else if (str.Trim().Substring(0, 1).ToUpper() == "D"){/*判断 Unix 风格*/string dir = str.Substring(56).Trim();if (dir != "." && dir != ".."){m += dir + "\n";}}}char[] n = new char[] { '\n' };return m.Split(n);}/// <summary>/// 判断当前目录下指定的子目录是否存在/// </summary>/// <param name="RemoteDirectoryName">指定的目录名</param>public bool DirectoryExist(string RemoteDirectoryName){string[] dirList = GetDirectoryList("");foreach (string str in dirList){if (str.Trim() == RemoteDirectoryName.Trim()){return true;}}return false;}/// <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){string[] fileList = GetFileList("*.*");foreach (string str in fileList){if (str.Trim() == RemoteFileName.Trim()){return true;}}return false;}/// <summary>/// 创建文件夹/// </summary>/// <param name="dirName"></param>public void MakeDir(string dirName){FtpWebRequest reqFTP;try{// dirName = name of the directory to create.reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + dirName));reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;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){Insert_Standard_ErrorLog.Insert("FtpWeb", "MakeDir Error --> " + ex.Message);}}/// <summary>/// 获取指定文件大小/// </summary>/// <param name="filename"></param>/// <returns></returns>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){Insert_Standard_ErrorLog.Insert("FtpWeb", "GetFileSize Error --> " + ex.Message);}return fileSize;}/// <summary>/// 改名/// </summary>/// <param name="currentFilename"></param>/// <param name="newFilename"></param>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){Insert_Standard_ErrorLog.Insert("FtpWeb", "ReName Error --> " + ex.Message);}}/// <summary>/// 移动文件/// </summary>/// <param name="currentFilename"></param>/// <param name="newFilename"></param>public void MovieFile(string currentFilename, string newDirectory){ReName(currentFilename, newDirectory);}/// <summary>/// 切换当前目录/// </summary>/// <param name="DirectoryName"></param>/// <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>/// 删除订单目录/// </summary>/// <param name="ftpServerIP">FTP 主机地址</param>/// <param name="folderToDelete">FTP 用户名</param>/// <param name="ftpUserID">FTP 用户名</param>/// <param name="ftpPassword">FTP 密码</param>public static void DeleteOrderDirectory(string ftpServerIP, string folderToDelete, string ftpUserID, string ftpPassword){try{if (!string.IsNullOrEmpty(ftpServerIP) && !string.IsNullOrEmpty(folderToDelete) && !string.IsNullOrEmpty(ftpUserID) && !string.IsNullOrEmpty(ftpPassword)){FtpWeb fw = new FtpWeb(ftpServerIP, folderToDelete, ftpUserID, ftpPassword);//进入订单目录fw.GotoDirectory(folderToDelete, true);//获取规格目录string[] folders = fw.GetDirectoryList("");foreach (string folder in folders){if (!string.IsNullOrEmpty(folder) || folder != ""){//进入订单目录string subFolder = folderToDelete + "/" + folder;fw.GotoDirectory(subFolder, true);//获取文件列表string[] files = fw.GetFileList("*.*");if (files != null){//删除文件foreach (string file in files){fw.Delete(file);}}//删除冲印规格文件夹fw.GotoDirectory(folderToDelete, true);fw.RemoveDirectory(folder);}}//删除订单文件夹string parentFolder = folderToDelete.Remove(folderToDelete.LastIndexOf('/'));string orderFolder = folderToDelete.Substring(folderToDelete.LastIndexOf('/') + 1);fw.GotoDirectory(parentFolder, true);fw.RemoveDirectory(orderFolder);}else{throw new Exception("FTP 及路径不能为空！");}}catch (Exception ex){throw new Exception("删除订单时发生错误，错误信息为：" + ex.Message);}}}public class Insert_Standard_ErrorLog{public static void Insert(string x, string y){}}}
}

原作者GetDirectoryList（）截取字符的位置应该是56不是54

TreeNode rootnode = GetFileTree();
treeView1.Nodes.Add(rootnode);

        //创建文件树结构public TreeNode GetFileTree(){TreeNode RootNode = new TreeNode();RootNode.Text = "FTP file";RootNode.ImageIndex = 1;RootNode.SelectedImageIndex = 1;String[] FTPfile_detail = FTPserver.GetFilesDetailList("");foreach (String temp in FTPfile_detail){//对于是文件夹的情况if (temp.Trim().Substring(0, 1).ToUpper() == "D"){TreeNode node = new TreeNode();node.Text = temp.Trim().Substring(56);node.ImageIndex = 1;node.SelectedImageIndex = 1;Create_filemap(ref node, "", temp.Trim().Substring(56));RootNode.Nodes.Add(node);}else //对于文件的情况{TreeNode node = new TreeNode();node.Text = temp.Trim().Substring(56);node.ImageIndex = 0;node.SelectedImageIndex = 0;RootNode.Nodes.Add(node);}}return RootNode;}//递归调用产生文件目录public bool Create_filemap(ref TreeNode sub_rootnode, String current_path, String folder_name){if (null == sub_rootnode){MessageBox.Show("传递的树节点为空", "ERROR", MessageBoxButtons.OK,MessageBoxIcon.Error);return false;}current_path = current_path + folder_name + "/";String[] FTPfile_detail = FTPserver.GetFilesDetailList(current_path);if(null != FTPfile_detail){foreach (String temp in FTPfile_detail){//对于是文件夹的情况if (temp.Trim().Substring(0, 1).ToUpper() == "D"){TreeNode node = new TreeNode();node.Text = temp.Trim().Substring(56);node.ImageIndex = 1;node.SelectedImageIndex = 1;Create_filemap(ref node, current_path, temp.Trim().Substring(56));sub_rootnode.Nodes.Add(node);}else    //对于文件的情况{TreeNode node = new TreeNode();node.Text = temp.Trim().Substring(56);node.ImageIndex = 0;node.SelectedImageIndex = 0;sub_rootnode.Nodes.Add(node);}}}return true;}