关于FTP的应用免不了要对FTP进行增删查改什么的。通过搜索，整理和修改，自己写了一个FTP的Helper类。此篇文章目的有二（2最近流行）。
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- 累积代码，方便自己以后查阅使用；
- 分享代码，方便他人使用。
以下是类：
FtpHelper.cs
以下是重点说明：
如何获取某一目录下的文件和文件夹列表。
由于FtpWebRequest类只提供了WebRequestMethods.Ftp.ListDirectory方式和WebRequestMethods.Ftp.ListDirectoryDetails方式。这个方法获取到的是包含文件列表和文件夹列表的信息。并不是单单只包含某一类。为此我们需要分析获取信息的特点。分析发现，对于文件夹会有“<DIR>”这一项，而文件没有。所以我们可以根据这个来区分。一下分别是获取文件列表和文件夹列表的代码：
获取文件夹：
/// <summary> /// 从ftp服务器上获得文件夹列表 /// </summary> /// <param name="RequedstPath">服务器下的相对路径</param> /// <returns></returns> public static List<string> GetDirctory(string RequedstPath) { List<string> strs = new List<string>(); try { string uri = path + RequedstPath; //目标路径 path为服务器地址 FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri)); // ftp用户名和密码 reqFTP.Credentials = new NetworkCredential(username, password); reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails; WebResponse response = reqFTP.GetResponse(); StreamReader reader = new StreamReader(response.GetResponseStream());//中文文件名 string line = reader.ReadLine(); while (line != null) { if (line.Contains("<DIR>")) { string msg = line.Substring(line.LastIndexOf("<DIR>")+5).Trim(); strs.Add(msg); } line = reader.ReadLine(); } reader.Close(); response.Close(); return strs; } catch (Exception ex) { Console.WriteLine("获取目录出错：" + ex.Message); } return strs; }
获取文件列表
/// <summary> /// 从ftp服务器上获得文件列表 /// </summary> /// <param name="RequedstPath">服务器下的相对路径</param> /// <returns></returns> public static List<string> GetFile(string RequedstPath) { List<string> strs = new List<string>(); try { string uri = path + RequedstPath; //目标路径 path为服务器地址 FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri)); // ftp用户名和密码 reqFTP.Credentials = new NetworkCredential(username, password); reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails; WebResponse response = reqFTP.GetResponse(); StreamReader reader = new StreamReader(response.GetResponseStream());//中文文件名 string line = reader.ReadLine(); while (line != null) { if (!line.Contains("<DIR>")) { string msg = line.Substring(39).Trim(); strs.Add(msg); } line = reader.ReadLine(); } reader.Close(); response.Close(); return strs; } catch (Exception ex) { Console.WriteLine("获取文件出错：" + ex.Message); } return strs; }
其他代码并不需要过多的说明，注释已经说的相当明确了。
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Net; using System.IO; using System.Threading; namespace FtpSyn { static public class FtpHelper { //基本设置 static private string path = @"ftp://" + Helper.GetAppConfig("obj") + "/"; //目标路径 static private string ftpip =Helper.GetAppConfig("obj"); //ftp IP地址 static private string username = Helper.GetAppConfig("username"); //ftp用户名 static private string password = Helper.GetAppConfig("password"); //ftp密码 //获取ftp上面的文件和文件夹 public static string[] GetFileList(string dir) { string[] downloadFiles; StringBuilder result = new StringBuilder(); FtpWebRequest request; try { request = (FtpWebRequest)FtpWebRequest.Create(new Uri(path)); request.UseBinary = true; request.Credentials = new NetworkCredential(username, password);//设置用户名和密码 request.Method = WebRequestMethods.Ftp.ListDirectory; request.UseBinary = true; WebResponse response = request.GetResponse(); StreamReader reader = new StreamReader(response.GetResponseStream()); string line = reader.ReadLine(); while (line != null) { result.Append(line); result.Append("\n"); Console.WriteLine(line); line = reader.ReadLine(); } // to remove the trailing '\n' result.Remove(result.ToString().LastIndexOf('\n'), 1); reader.Close(); response.Close(); return result.ToString().Split('\n'); } catch (Exception ex) { Console.WriteLine("获取ftp上面的文件和文件夹：" + ex.Message); downloadFiles = null; return downloadFiles; } } /// <summary> /// 获取文件大小 /// </summary> /// <param name="file">ip服务器下的相对路径</param> /// <returns>文件大小</returns> public static int GetFileSize(string file) { StringBuilder result = new StringBuilder(); FtpWebRequest request; try { request = (FtpWebRequest)FtpWebRequest.Create(new Uri(path + file)); request.UseBinary = true; request.Credentials = new NetworkCredential(username, password);//设置用户名和密码 request.Method = WebRequestMethods.Ftp.GetFileSize; int dataLength = (int)request.GetResponse().ContentLength; return dataLength; } catch (Exception ex) { Console.WriteLine("获取文件大小出错：" + ex.Message); return -1; } } /// <summary> /// 文件上传 /// </summary> /// <param name="filePath">原路径（绝对路径）包括文件名</param> /// <param name="objPath">目标文件夹：服务器下的相对路径 不填为根目录</param> public static void FileUpLoad(string filePath,string objPath="") { try { string url = path; if(objPath!="") url += objPath + "/"; try { FtpWebRequest reqFTP = null; //待上传的文件 （全路径） try { FileInfo fileInfo = new FileInfo(filePath); using (FileStream fs = fileInfo.OpenRead()) { long length = fs.Length; reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(url + fileInfo.Name)); //设置连接到FTP的帐号密码 reqFTP.Credentials = new NetworkCredential(username, password); //设置请求完成后是否保持连接 reqFTP.KeepAlive = false; //指定执行命令 reqFTP.Method = WebRequestMethods.Ftp.UploadFile; //指定数据传输类型 reqFTP.UseBinary = true; using (Stream stream = reqFTP.GetRequestStream()) { //设置缓冲大小 int BufferLength = 5120; byte[] b = new byte[BufferLength]; int i; while ((i = fs.Read(b, 0, BufferLength)) > 0) { stream.Write(b, 0, i); } Console.WriteLine("上传文件成功"); } } } catch (Exception ex) { Console.WriteLine("上传文件失败错误为" + ex.Message); } finally { } } catch (Exception ex) { Console.WriteLine("上传文件失败错误为" + ex.Message); } finally { } } catch (Exception ex) { Console.WriteLine("上传文件失败错误为" + ex.Message); } } /// <summary> /// 删除文件 /// </summary> /// <param name="fileName">服务器下的相对路径 包括文件名</param> public static void DeleteFileName(string fileName) { try { FileInfo fileInf = new FileInfo(ftpip +""+ fileName); string uri = path + fileName; FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri)); // 指定数据传输类型 reqFTP.UseBinary = true; // ftp用户名和密码 reqFTP.Credentials = new NetworkCredential(username, password); // 默认为true，连接不会被关闭 // 在一个命令之后被执行 reqFTP.KeepAlive = false; // 指定执行什么命令 reqFTP.Method = WebRequestMethods.Ftp.DeleteFile; FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse(); response.Close(); } catch (Exception ex) { Console.WriteLine("删除文件出错：" + ex.Message); } } /// <summary> /// 新建目录 上一级必须先存在 /// </summary> /// <param name="dirName">服务器下的相对路径</param> public static void MakeDir(string dirName) { try { string uri = path + dirName; FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri)); // 指定数据传输类型 reqFTP.UseBinary = true; // ftp用户名和密码 reqFTP.Credentials = new NetworkCredential(username, password); reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory; FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse(); response.Close(); } catch (Exception ex) { Console.WriteLine("创建目录出错：" + ex.Message); } } /// <summary> /// 删除目录 上一级必须先存在 /// </summary> /// <param name="dirName">服务器下的相对路径</param> public static void DelDir(string dirName) { try { string uri = path + dirName; FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri)); // ftp用户名和密码 reqFTP.Credentials = new NetworkCredential(username, password); reqFTP.Method = WebRequestMethods.Ftp.RemoveDirectory; FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse(); response.Close(); } catch (Exception ex) { Console.WriteLine("删除目录出错：" + ex.Message); } } /// <summary> /// 从ftp服务器上获得文件夹列表 /// </summary> /// <param name="RequedstPath">服务器下的相对路径</param> /// <returns></returns> public static List<string> GetDirctory(string RequedstPath) { List<string> strs = new List<string>(); try { string uri = path + RequedstPath; //目标路径 path为服务器地址 FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri)); // ftp用户名和密码 reqFTP.Credentials = new NetworkCredential(username, password); reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails; WebResponse response = reqFTP.GetResponse(); StreamReader reader = new StreamReader(response.GetResponseStream());//中文文件名 string line = reader.ReadLine(); while (line != null) { if (line.Contains("<DIR>")) { string msg = line.Substring(line.LastIndexOf("<DIR>")+5).Trim(); strs.Add(msg); } line = reader.ReadLine(); } reader.Close(); response.Close(); return strs; } catch (Exception ex) { Console.WriteLine("获取目录出错：" + ex.Message); } return strs; } /// <summary> /// 从ftp服务器上获得文件列表 /// </summary> /// <param name="RequedstPath">服务器下的相对路径</param> /// <returns></returns> public static List<string> GetFile(string RequedstPath) { List<string> strs = new List<string>(); try { string uri = path + RequedstPath; //目标路径 path为服务器地址 FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri)); // ftp用户名和密码 reqFTP.Credentials = new NetworkCredential(username, password); reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails; WebResponse response = reqFTP.GetResponse(); StreamReader reader = new StreamReader(response.GetResponseStream());//中文文件名 string line = reader.ReadLine(); while (line != null) { if (!line.Contains("<DIR>")) { string msg = line.Substring(39).Trim(); strs.Add(msg); } line = reader.ReadLine(); } reader.Close(); response.Close(); return strs; } catch (Exception ex) { Console.WriteLine("获取文件出错：" + ex.Message); } return strs; } } }
希望对你有所帮助。