Ftp的操作

using System.IO;
using System.Net;
using System.Text;
using System.Diagnostics;
using System.Text.RegularExpressions;

    //从ftp上下载文件
    private void Download(string filePath, string ImageSrc, string ImageName, string ftpServerIP, string 
 

ftpUserName, string ftpPwd)
    {
        if (!Directory.Exists(filePath))
        {
            Directory.CreateDirectory(filePath);
        }
        using (FileStream OutputStream = new FileStream(filePath + "\\" + ImageName, FileMode.Create))
        {
            FtpWebRequest ReqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + 

ImageSrc));

            ReqFTP.Method = WebRequestMethods.Ftp.DownloadFile;

            ReqFTP.UseBinary = true;

            ReqFTP.Credentials = new NetworkCredential(ftpUserName, ftpPwd);

            using (FtpWebResponse response = (FtpWebResponse)ReqFTP.GetResponse())
            {

                using (Stream 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);
                    }

                    FtpStream.Close();
                }

                response.Close();

            }

            OutputStream.Close();
        }

    }
        //从服务器上传文件到FTP上
    private void UploadSmall(string sFileDstPath, string FolderName, string ftpServerIP, string ftpUserName, 

string ftpPwd)
    {

        FileInfo fileInf = new FileInfo(sFileDstPath);

        FtpWebRequest reqFTP;

        reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + FolderName + "/" + 

fileInf.Name));

        reqFTP.Credentials = new NetworkCredential(ftpUserName, ftpPwd);

        reqFTP.KeepAlive = false;

        reqFTP.Method = WebRequestMethods.Ftp.UploadFile;

        reqFTP.UseBinary = true;

        reqFTP.ContentLength = fileInf.Length;

        int buffLength = 2048;

        byte[] buff = new byte[buffLength];

        int contentLen;

        using (FileStream fs = fileInf.OpenRead())
        {

            using (Stream strm = reqFTP.GetRequestStream())
            {

                contentLen = fs.Read(buff, 0, buffLength);

                while (contentLen != 0)
                {

                    strm.Write(buff, 0, contentLen);

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

                strm.Close();
            }

            fs.Close();
        }

    }
    //删除服务器上的文件
    private void DeleteWebServerFile(string sFilePath)
    {
        if (File.Exists(sFilePath))
        {
            File.Delete(sFilePath);
        }
    }
    //删除FTP上的文件
    private void DeleteFtpFile(string[] IName, string FolderName, string ftpServerIP, string ftpUserName, string 

ftpPwd)
    {
        foreach (string ImageName in IName)
        {
            string[] FileList = GetFileList(FolderName, ftpServerIP, ftpUserName, ftpPwd);
            for (int i = 0; i < FileList.Length; i++)
            {
                string Name = FileList[i].ToString();
                if (Name == ImageName)
                {
                    FtpWebRequest ReqFTP;

                    ReqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + 

FolderName + "/" + ImageName));

                    ReqFTP.Credentials = new NetworkCredential(ftpUserName, ftpPwd);

                    ReqFTP.KeepAlive = false;

                    ReqFTP.Method = WebRequestMethods.Ftp.DeleteFile;

                    ReqFTP.UseBinary = true;

                    using (FtpWebResponse Response = (FtpWebResponse)ReqFTP.GetResponse())
                    {

                        long size = Response.ContentLength;

                        using (Stream datastream = Response.GetResponseStream())
                        {

                            using (StreamReader sr = new StreamReader(datastream))
                            {

                                sr.ReadToEnd();

                                sr.Close();
                            }

                            datastream.Close();
                        }

                        Response.Close();
                    }
                }
            }

        }

    }
    //检查文件是否存在
    public string[] GetFileList(string FolderName, string ftpServerIP, string ftpUserName, string ftpPwd)
    {
        string[] downloadFiles;

        StringBuilder result = new StringBuilder();

        FtpWebRequest reqFTP;
        try
        {
            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + FolderName + 

"/"));

            reqFTP.UseBinary = true;

            reqFTP.Credentials = new NetworkCredential(ftpUserName, ftpPwd);

            reqFTP.Method = WebRequestMethods.Ftp.ListDirectory;

            WebResponse response = reqFTP.GetResponse();

            StreamReader reader = new StreamReader(response.GetResponseStream());

            string line = reader.ReadLine();

            while (line != null)
            {
                result.Append(line);

                result.Append("\n");

                line = reader.ReadLine();
            }
            // to remove the trailing '\n'        
            result.Remove(result.ToString().LastIndexOf('\n'), 1);

            reader.Close();

            response.Close();

            return result.ToString().Split('\n');
        }
        catch (Exception ex)
        {
            downloadFiles = null;
            return downloadFiles;
        }
    }
    //从客户端上传文件到FTP上
    private void UploadFtp(HttpPostedFile sFilePath, string filename, string FolderName, string ftpServerIP, 

string ftpUserName, string ftpPwd)
    {
        //获取的服务器路径
        //FileInfo fileInf = new FileInfo(sFilePath);

        FtpWebRequest reqFTP;

        reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + FolderName + "/" + 

filename));

        reqFTP.Credentials = new NetworkCredential(ftpUserName, ftpPwd);

        reqFTP.KeepAlive = false;

        reqFTP.Method = WebRequestMethods.Ftp.UploadFile;

        reqFTP.UseBinary = true;

        reqFTP.ContentLength = sFilePath.ContentLength;
        //设置缓存
        int buffLength = 2048;

        byte[] buff = new byte[buffLength];

        int contentLen;

        using (Stream fs = sFilePath.InputStream)
        {

            using (Stream strm = reqFTP.GetRequestStream())
            {

                contentLen = fs.Read(buff, 0, buffLength);

                while (contentLen != 0)
                {

                    strm.Write(buff, 0, contentLen);

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

                strm.Close();
            }

            fs.Close();
        }

    }
    //创建目录
    private void CreateDirectory(string FolderName, string ftpServerIP, string ftpUserName, string ftpPwd)
    {
        //创建日期目录
        try
        {
            FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + 

FolderName));

            reqFTP.UseBinary = true;

            reqFTP.Credentials = new NetworkCredential(ftpUserName, ftpPwd);

            reqFTP.KeepAlive = false;

            reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;

            FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
        }
        catch
        {
            ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('系统忙，请稍后再

试！');location.href=location.href;</script>");
        }
    }
    //检查日期目录和文件是否存在
    private static Regex regexName = new Regex(@"[^\s]*$", RegexOptions.Compiled);
    private bool CheckFileOrPath(string FolderName, string ftpServerIP, string ftpUserName, string ftpPwd)
    {
        //检查一下日期目录是否存在
        FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/"));

        reqFTP.UseBinary = true;

        reqFTP.Credentials = new NetworkCredential(ftpUserName, ftpPwd);

        reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails;

        Stream stream = reqFTP.GetResponse().GetResponseStream();

        using (StreamReader sr = new StreamReader(stream))
        {
            string line = sr.ReadLine();

            while (!string.IsNullOrEmpty(line))
            {
                GroupCollection gc = regexName.Match(line).Groups;
                if (gc.Count != 1)
                {
                    throw new ApplicationException("FTP 返回的字串格式不正确");
                }

                string path = gc[0].Value;
                if (path == FolderName)
                {
                    return true;
                }

                line = sr.ReadLine();
            }
        }

        return false;

    }
}