C# FtpHelper实现ftp服务器文件读写操作

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最近做了一个项目，需要读取ftp服务器上的文件，于是参考了网上提供的一些帮组方法，使用过程中，出现一些小细节问题，于是本人做了一些修改，拿来分享一下

 using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Net; using System.IO; using System.Threading;using System.Configuration;  namespace FtpSyn {     public  class FtpHelper     {         //基本设置 ftp://400:ZOina2017@192.168.10.17/400backup         static PRivate string path = @"ftp://" + ConfigurationManager.AppSettings["FtpServerip"].ToString() + "/";    //目标路径         static private string ftpip = ConfigurationManager.AppSettings["FtpServerIP"].ToString();    //ftp IP地址         static private string username = ConfigurationManager.AppSettings["FtpUserName"].ToString();   //ftp用户名         static private string passWord = ConfigurationManager.AppSettings["FtpPassWord"].ToString();   //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 + dir));                 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;                 request.UsePassive = false;  //选择主动还是被动模式 ,  这句要加上的。                 request.KeepAlive = false;//一定要设置此属性，否则一次性下载多个文件的时候，会出现异常。                 WebResponse response = request.GetResponse();                 StreamReader reader = new StreamReader(response.GetResponseStream());                  string 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)             {                 LogHelper.writeErrorLog("获取ftp上面的文件和文件夹：" + ex.Message);                 downloadFiles = null;                 return downloadFiles;             }         }         /// <summary>         /// 从ftp服务器上获取文件并将内容全部转换成string返回         /// </summary>         /// <param name="fileName"></param>         /// <param name="dir"></param>         /// <returns></returns>          public static string GetFileStr(string fileName, string dir)         {             FtpWebRequest reqFTP;             try             {                 reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(path + dir + "/" + fileName));                 reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;                 reqFTP.UseBinary = true;                 reqFTP.Credentials = new NetworkCredential(username, password);                 reqFTP.UsePassive = false;  //选择主动还是被动模式 ,  这句要加上的。                 reqFTP.KeepAlive = false;//一定要设置此属性，否则一次性下载多个文件的时候，会出现异常。                 FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();                 Stream ftpStream = response.GetResponseStream();                 StreamReader reader = new StreamReader(ftpStream);                 string fileStr = reader.ReadToEnd();                 reader.Close();                 ftpStream.Close();                 response.Close();                 return fileStr;             }             catch (Exception ex)             {                 LogHelper.writeErrorLog("获取ftp文件并读取内容失败：" + ex.Message);                 return null;             }         }           /// <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;         }          } }