C#访问FTP | 易学教程

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.IO;
using System.Net;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //FTPUploadFile("127.0.0.1/zwx" , "administrator", "123123", "e:\\饭卡记录清单.xls");
            //FTPDownloadFile("127.0.0.1/zwx", "administrator", "123123", "d:", "123.xls", "饭卡记录清单.xls");
            string[] fileList = FTPGetFileList("127.0.0.1/zwx/1", "administrator", "123123");
            for (int i = 0; i < fileList.Length; i++)
            {
                Console.WriteLine(fileList[i]);
            }

Console.Read();
}

#region FTP获取文件列表

        /// <summary>
        /// FTP获取文件列表
        /// </summary>
        /// <param name="ftpServerIP"></param>
        /// <param name="ftpUserID"></param>
        /// <param name="ftpPassword"></param>
        /// <returns></returns>
        private static string[] FTPGetFileList(string ftpServerIP, string ftpUserID, string ftpPassword)
        {
            //响应结果
            StringBuilder result = new StringBuilder();

//FTP请求
FtpWebRequest ftpRequest = null;

//FTP响应
WebResponse ftpResponse = null;

//FTP响应流
StreamReader ftpResponsStream = null;

            try
            {
                //生成FTP请求
                ftpRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/"));

//设置文件传输类型
ftpRequest.UseBinary = true;

//FTP登录
ftpRequest.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

//设置FTP方法
ftpRequest.Method = WebRequestMethods.Ftp.ListDirectory;

//生成FTP响应
ftpResponse = ftpRequest.GetResponse();

//FTP响应流
ftpResponsStream = new StreamReader(ftpResponse.GetResponseStream());

string line = ftpResponsStream.ReadLine();

                while (line != null)
                {
                    result.Append(line);
                    result.Append("\n");
                    line = ftpResponsStream.ReadLine();
                }

//去掉结果列表中最后一个换行
result.Remove(result.ToString().LastIndexOf('\n'), 1);

                //返回结果
                return result.ToString().Split('\n');
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return (null);
            }
            finally
            {
                if (ftpResponsStream != null)
                {
                    ftpResponsStream.Close();
                }

                if (ftpResponse != null)
                {
                    ftpResponse.Close();
                }
            }
        }

#endregion

#region FTP下载文件

        /// <summary>
        /// FTP下载文件
        /// </summary>
        /// <param name="ftpServerIP">FTP服务器IP</param>
        /// <param name="ftpUserID">FTP登录帐号</param>
        /// <param name="ftpPassword">FTP登录密码</param>
        /// <param name="saveFilePath">保存文件路径</param>
        /// <param name="saveFileName">保存文件名</param>
        /// <param name="downloadFileName">下载文件名</param>
        private static void FTPDownloadFile(string ftpServerIP, string ftpUserID, string ftpPassword,
            string saveFilePath, string saveFileName, string downloadFileName)
        {
            //定义FTP请求对象
            FtpWebRequest ftpRequest = null;
            //定义FTP响应对象
            FtpWebResponse ftpResponse = null;

            //存储流
            FileStream saveStream = null;
            //FTP数据流
            Stream ftpStream = null;

            try
            {
                //生成下载文件
                saveStream = new FileStream(saveFilePath + "\\" + saveFileName, FileMode.Create);

//生成FTP请求对象
ftpRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + downloadFileName));

//设置下载文件方法
ftpRequest.Method = WebRequestMethods.Ftp.DownloadFile;

//设置文件传输类型
ftpRequest.UseBinary = true;

//设置登录FTP帐号和密码
ftpRequest.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

//生成FTP响应对象
ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();

//获取FTP响应流对象
ftpStream = ftpResponse.GetResponseStream();

//响应数据长度
long cl = ftpResponse.ContentLength;

int bufferSize = 2048;

int readCount;

byte[] buffer = new byte[bufferSize];

//接收FTP文件流
readCount = ftpStream.Read(buffer, 0, bufferSize);

                while (readCount > 0)
                {
                    saveStream.Write(buffer, 0, readCount);

readCount = ftpStream.Read(buffer, 0, bufferSize);
}

            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            finally
            {
                if (ftpStream != null)
                {
                    ftpStream.Close();
                }

                if (saveStream != null)
                {
                    saveStream.Close();
                }

                if (ftpResponse != null)
                {
                    ftpResponse.Close();
                }
            }
        }

#endregion

#region FTP上传文件

        /// <summary>
        /// FTP上传文件
        /// </summary>
        /// <param name="ftpServerIP">FTP服务器IP</param>
        /// <param name="ftpUserID">FTP登录帐号</param>
        /// <param name="ftpPassword">FTP登录密码</param>
        /// <param name="filename">上文件文件名（绝对路径）</param>
        private static void FTPUploadFile(string ftpServerIP, string ftpUserID, string ftpPassword, string filename)
        {
            //上传文件
            FileInfo uploadFile = null;

            //上传文件流
            FileStream uploadFileStream = null;

//FTP请求对象
FtpWebRequest ftpRequest = null;

//FTP流
Stream ftpStream = null;

            try
            {
                //获取上传文件
                uploadFile = new FileInfo(filename);

//创建FtpWebRequest对象
ftpRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + uploadFile.Name));

//FTP登录
ftpRequest.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

                // 默认为true，连接不会被关闭
                // 在一个命令之后被执行
                ftpRequest.KeepAlive = false;

//FTP请求执行方法
ftpRequest.Method = WebRequestMethods.Ftp.UploadFile;

// 指定数据传输类型
ftpRequest.UseBinary = true;

// 上传文件时通知服务器文件的大小
ftpRequest.ContentLength = uploadFile.Length;

// 缓冲大小设置为2kb
int buffLength = 2048;

byte[] buff = new byte[buffLength];
int contentLen;

// 打开一个文件流读上传的文件
uploadFileStream = uploadFile.OpenRead();

// 把上传的文件写入流
ftpStream = ftpRequest.GetRequestStream();

// 每次读文件流的2kb
contentLen = uploadFileStream.Read(buff, 0, buffLength);

                // 流内容没有结束
                while (contentLen != 0)
                {
                    // 把内容从file stream 写入 upload stream
                    ftpStream.Write(buff, 0, contentLen);

contentLen = uploadFileStream.Read(buff, 0, buffLength);
}

            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            finally
            {
                if (uploadFileStream != null)
                {
                    uploadFileStream.Close();
                }

                if (ftpStream != null)
                {
                    ftpStream.Close();
                }
            }
        }

#endregion
}
}

来源：https://www.cnblogs.com/qiren5761/archive/2010/01/22/1654496.html

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