FtpHelper实现ftp服务器文件读写操作(C#)

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;
         }

     }
 }