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;
}
}
}
本人（徐自勉）原创内容，转载请注明出处，作者.
