C# 简单FTP客户端源码（支持SSL/TLS加密）

Tags

C++, FTP, Source Code, TLS

在网上找了半天也没有找到一个比较满意的C# FTP Class，参考着各种资料自己写了一个比较简单的版本

主要功能如下

• 设置远程路径
• 支持SSL/TLS加密（默认支持自签名证书，如不需要请删除ServerCertificateValidationCallback)
• 支持上传/下载文件
• 支持正则表达式列出文件列表（表达式留空即为列出所有）
• 连接测试功能

可能还存在一些bug和兼容性问题….这个以后再慢慢测试吧（逃

比较坑爹的一点是现在又要求使用隐式TSL FTP，而微软只支持显示的，于是还得再去找第三方库……..

using System;
using System.Text;
using System.IO;
using System.Net;
using System.Text.RegularExpressions;
using System.Net.Security;
namespace MyFTP
{
    public class FtpClient
    {
        string ftpServerIP;
        string ftpRemotePath;
        string ftpUserID;
        string ftpPassword;
        string ftpURI;
        bool ftpUseSSL;
        /// <summary>
        /// 连接FTP
        /// </summary>
        /// <param name="FtpServerIP">FTP连接地址</param>
        /// <param name="FtpRemotePath">指定FTP远程目录</param>
        /// <param name="FtpUserID">用户名</param>
        /// <param name="FtpPassword">密码</param>
        /// <param name="useSSL">使用SSL</param>
        public FtpClient(string FtpServerIP, string FtpRemotePath, string FtpUserID, string FtpPassword,bool useSSL)
        {
            ServicePointManager.ServerCertificateValidationCallback
             = new RemoteCertificateValidationCallback((a, b, c, d) => { return true; });
            ftpServerIP = FtpServerIP;
            ftpRemotePath = FtpRemotePath;
            ftpUserID = FtpUserID;
            ftpPassword = FtpPassword;
            ftpUseSSL = useSSL;
            if (ftpUseSSL)
            {
                ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/";
            }
            else
                ftpURI = "ftp://" + ftpServerIP + "/" + ftpRemotePath + "/";
        }

        /// <summary>
        /// 上传
        /// </summary>
        /// <param name="filename">本地文件路径名称</param>
        public void Upload(string filename)
        {
            FileInfo fileInf = new FileInfo(filename);
            string uri = ftpURI + fileInf.Name;
            FtpWebRequest reqFTP;
            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));
            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
            reqFTP.KeepAlive = false;
            reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
            reqFTP.UseBinary = true;
            if (ftpUseSSL)
            {
                reqFTP.EnableSsl = true;
            }
            reqFTP.ContentLength = fileInf.Length;
            int buffLength = 2048;
            byte[] buff = new byte[buffLength];
            int contentLen;
            FileStream fs = fileInf.OpenRead();
            Stream strm = null;
            try
            {
                strm = reqFTP.GetRequestStream();
                contentLen = fs.Read(buff, 0, buffLength);
                while (contentLen != 0)
                {
                    strm.Write(buff, 0, contentLen);
                    contentLen = fs.Read(buff, 0, buffLength);
                }
            }
            catch (Exception ex)
            {
                throw (ex);
            }
            finally
            {
                if (strm != null)
                {
                    strm.Close();
                }
                if (fs != null)
                {
                    fs.Close();
                }
            }
        }

        /// <summary>
        /// 下载
        /// </summary>
        /// <param name="filePath">本地保存文件路径</param>
        /// <param name="fileName">服务器文件名</param>
        public void Download(string filePath, string fileName)
        {
            FtpWebRequest reqFTP;
            FileStream outputStream = null;
            FtpWebResponse response = null;
            Stream ftpStream = null;
            try
            {
                outputStream = new FileStream(filePath + "//" + fileName, FileMode.Create);
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + fileName));
                reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
                reqFTP.UseBinary = true;
                if (ftpUseSSL)
                {
                    reqFTP.EnableSsl = true;
                }
                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                response = (FtpWebResponse)reqFTP.GetResponse();

                ftpStream = response.GetResponseStream();
                long cl = response.ContentLength;
                int bufferSize = 2048;
                int readCount;
                byte[] buffer = new byte[bufferSize];
                readCount = ftpStream.Read(buffer, 0, bufferSize);
                while (readCount > 0)
                {
                    outputStream.Write(buffer, 0, readCount);
                    readCount = ftpStream.Read(buffer, 0, bufferSize);
                }

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

                if (outputStream != null)
                {
                    outputStream.Close();
                }
                if (response != null)
                {
                    response.Close();
                }
            }
        }

        /// <summary>
        /// 获取当前目录下满足指定正则表达式的文件名列表
        /// </summary>
        ///  <param name="regExp">正则表达式</param>
        /// <returns>string[]</returns>
        public string[] GetFileList(string regExp)
        {
            StringBuilder result = new StringBuilder();
            FtpWebRequest request = null;
            StreamReader reader = null;
            WebResponse response = null;
            try
            {
                request = (FtpWebRequest)FtpWebRequest.Create(ftpURI);
                request.UseBinary = true;
                request.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                request.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
                request.UseBinary = true;
                if (ftpUseSSL)
                {
                    request.EnableSsl = true;
                }
                response = request.GetResponse();
                reader = new StreamReader(response.GetResponseStream());

                string line = reader.ReadLine();
                while (line != null)
                {
                    if (regExp.Length != 0)
                    {
                        Regex rg = new Regex(regExp);
                        line = rg.Match(line).Value;
                    }
                    result.Append(line);
                    if (line != "")
                    {
                        result.Append("n");
                    }
                    line = reader.ReadLine();
                }
                // to remove the trailing 'n''
                if (result.Length != 0)
                {
                    result.Remove(result.ToString().LastIndexOf('n'), 1);
                }
                return result.ToString().Split('n');
            }
            catch (Exception ex)
            {

                throw (ex);
            }
            finally
            {
                if (request != null)
                {
                    request.Abort();
                }
                if (response != null)
                {
                    response.Close();
                }
                if (reader != null)
                {
                    reader.Close();
                }
            }
        }

        /// <summary>
        ///  测试FTP服务器连接
        /// </summary>
        public string test()
        {
            StringBuilder result = new StringBuilder();
            FtpWebRequest request = null;
            StreamReader reader = null;
            WebResponse response = null;
            try
            {
                 request = (FtpWebRequest)FtpWebRequest.Create(ftpURI);
                request.UseBinary = true;
                request.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                request.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
                request.UseBinary = true;
                if (ftpUseSSL)
                {
                    request.EnableSsl = true;
                }
                response = request.GetResponse();
                reader = new StreamReader(response.GetResponseStream());

                string line = reader.ReadLine();
                while (line != null)
                {
                    if (line != "")
                    {
                        result.Append("n");
                    }
                    line = reader.ReadLine();
                }
            }
            catch (Exception ex)
            {
                return "FTP访问失败:" + ex.Message;
            }
            finally
            {
                if (request != null)
                {
                    request.Abort();
                }
                if (response != null)
                {
                    response.Close();
                }
                if (reader != null)
                {
                    reader.Close();
                }

            }
            return "FTP访问成功";
        }

    }
}