c#ftp操作全解：创建删除目录，上传下载文件，删除移动文件，文件改名，文件目录查询

全栈工程师开发手册（作者：栾鹏）
c#教程全解

c#实现ftp的操作。包括创建删除目录，上传下载文件，删除移动文件，文件改名，文件目录查询。

在调试ftp前，需要在目标主机上开启ftp功能。这里在本机上调试，目标主机也是本机。ftp信息如下表

主机地址192.168.8.101，端口号使用默认21端口，开启了匿名登录。所以在代码中登陆ftp账号密码为空。

测试代码

static void Main()
{FtpWeb ftp=new FtpWeb("192.168.8.101","","","");  //匿名登陆ftpif (!ftp.DirectoryExist("", "lp"))   //判断指定目录下是否存在指定的子目录{System.Console.WriteLine("ftp上lp文件夹内存在lp1文件夹");ftp.MakeDir("lp");  //创建一个lp的文件夹ftp.MakeDir("lp/lp1");  //创建一个lp1的子文件夹}if (!ftp.DirectoryExist("lp", "lp2")) //判断指定目录是否存在一个子文件夹{ftp.MakeDir("lp/lp2");  //创建一个lp2的子文件夹}if (!ftp.FileExist("lp", "test.txt"))   //判断指定目录下是否存在指定的文件{System.Console.WriteLine("ftp上lp文件夹内存在test.txt文件");ftp.Upload("J:\\test.txt", "lp/test.txt");   //将本地J:\\test.txt文件上传到ftp目录下lp/test.txt}ftp.Download("lp/test.txt", "J:\\test1.txt");   //将ftp目录下stk/test.txt下载到本地J:\\test.txt文件string[] allfile = ftp.GetFilesDetailList("lp");  //获取ftp根目录下lp文件夹内的明细（包含文件和文件夹）foreach (string str in allfile){System.Console.WriteLine(str);}allfile = ftp.GetDirectoryList("lp");   //获取指定目录下的文件夹列表foreach (string str in allfile){System.Console.WriteLine(str);}long filesize = ftp.GetFileSize("lp/test.txt");  //查询指定文件的大小ftp.ReName("lp/test.txt", "test1.txt");  //将指定文件改名，只能相同目录ftp.MovieFile("lp/test1.txt", "test2.txt");  //将指定文件移动，只能相同目录ftp.Delete("lp/test2.txt");   //删除ftp上的文件ftp.RemoveDirectory("lp/lp2");   //删除ftp上的lp2文件夹(ftp要求只能删除空的目录，除非先删除里面的文件)
}}
}

ftp工具类的实现

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Globalization;
using System.Net;
using System.IO;
using System.Windows.Forms;namespace util
{public class FtpWeb{string ftpServerIP;string ftpRemotePath;string ftpUserID;string ftpPassword;string ftpURI;// 连接FTP//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public FtpWeb(string FtpServerIP, string FtpRemotePath, string FtpUserID, string FtpPassword){ftpServerIP = FtpServerIP;ftpRemotePath = FtpRemotePath;ftpUserID = FtpUserID;ftpPassword = FtpPassword;ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/";}// 上传public void Upload(string localpath,string urlpath){FileInfo fileInf = new FileInfo(localpath);string uri = ftpURI + urlpath;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){MessageBox.Show(ex.ToString());}}// 下载public void Download(string urlpath,string localpath){FtpWebRequest reqFTP;try{FileStream outputStream = new FileStream(localpath, FileMode.Create);reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + urlpath));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){MessageBox.Show(ex.ToString());}}// 删除文件public void Delete(string urlpath){try{string uri = ftpURI + urlpath;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){MessageBox.Show(ex.ToString());}}// 删除文件夹public void RemoveDirectory(string urlpath){try{string uri = ftpURI + urlpath;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){MessageBox.Show(ex.ToString());}}//获取指定目录下明细(包含文件和文件夹)public string[] GetFilesDetailList(string urlpath){string[] downloadFiles;try{bool getin=false;string uri = ftpURI + urlpath;StringBuilder result = new StringBuilder();FtpWebRequest ftp;ftp = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));ftp.Credentials = new NetworkCredential(ftpUserID, ftpPassword);ftp.Method = WebRequestMethods.Ftp.ListDirectoryDetails;WebResponse response = ftp.GetResponse();StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.Default);string line = reader.ReadLine();while (line != null){getin = true;result.Append(line);result.Append("\n");line = reader.ReadLine();}if(getin)result.Remove(result.ToString().LastIndexOf("\n"), 1);reader.Close();response.Close();return result.ToString().Split('\n');}catch (Exception ex){downloadFiles = null;MessageBox.Show(ex.ToString());return downloadFiles;}}// 获取指定目录下文件列表(仅文件)public string[] GetFileList(string urlpath,string mask){string[] downloadFiles;StringBuilder result = new StringBuilder();FtpWebRequest reqFTP;try{string uri = ftpURI + urlpath;reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));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)。"){MessageBox.Show(ex.ToString());}return downloadFiles;}}// 获取指定目录下所有的文件夹列表(仅文件夹)public string[] GetDirectoryList(string urlpath){string[] drectory = GetFilesDetailList(urlpath);string m = string.Empty;foreach (string str in drectory){if (str == "")continue;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(54).Trim();if (dir != "." && dir != ".."){m += dir + "\n";}}}if (m[m.Length - 1] == '\n')m.Remove(m.Length - 1);char[] n = new char[] { '\n' };return m.Split(n);   //这样最后一个始终是空格了}/// 判断指定目录下是否存在指定的子目录// RemoteDirectoryName指定的目录名public bool DirectoryExist(string urlpath,string RemoteDirectoryName){string[] dirList = GetDirectoryList(urlpath);foreach (string str in dirList){if (str.Trim() == RemoteDirectoryName.Trim()){return true;}}return false;}// 判断指定目录下是否存在指定的文件//远程文件名public bool FileExist(string urlpath,string RemoteFileName){string[] fileList = GetFileList(urlpath,"*.*");foreach (string str in fileList){if (str.Trim() == RemoteFileName.Trim()){return true;}}return false;}// 创建文件夹public void MakeDir(string urlpath){FtpWebRequest reqFTP;try{// dirName = name of the directory to create.reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI +urlpath));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){MessageBox.Show(ex.ToString());}}// 获取指定文件大小public long GetFileSize(string urlpath){FtpWebRequest reqFTP;long fileSize = 0;try{reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + urlpath));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){MessageBox.Show(ex.ToString());}return fileSize;}// 改名public void ReName(string urlpath, string newname){FtpWebRequest reqFTP;try{reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + urlpath));  //源路径reqFTP.Method = WebRequestMethods.Ftp.Rename;reqFTP.RenameTo = newname; //新名称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){MessageBox.Show(ex.ToString());}}// 移动文件public void MovieFile(string urlpath, string newname){ReName(urlpath, newname);}// 切换当前目录/// <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 + "/";}}}

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