ftp 上传与下载

//上传

ftpmg.Upload("", DateTime.Now.ToString("yyyyMMddhhmmss"));

//下载

ftpmg.Download(@"E:", "tt.txt", out errorinfo);

 

  string ftpServerIP;
        string ftpUserID;
        string ftpPassword;
        FtpWebRequest reqFTP;
        private void Connect(String path)//连接ftp
        {
            // 根据uri创建FtpWebRequest对象
            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(path));
            // 指定数据传输类型
            reqFTP.UseBinary = true;
            // ftp用户名和密码
            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
        }
        public FtpManager(string ftpServerIP, string ftpUserID, string ftpPassword)
        {
            this.ftpServerIP = ftpServerIP;
            this.ftpUserID = ftpUserID;
            this.ftpPassword = ftpPassword;

        }
     

      

        public void Upload(string path, string filename) //上面的代码实现了向ftp服务器上载文件的功能
        {
            FileInfo fileInf = new FileInfo(filename);
            string uri = "";
            if (path != "")
                uri = "ftp://" + ftpServerIP + "/" + path + "/" + fileInf.Name;
            else
                uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;


            Connect(uri);//连接          

            // 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.UploadFile;

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

            // 缓冲大小设置为kb 
            int buffLength = 2048;

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

            // 打开一个文件流(System.IO.FileStream) 去读上传的文件
            FileStream fs = fileInf.OpenRead();

            Stream strm = null;
            try
            {
                // 把上传的文件写入流
                strm = reqFTP.GetRequestStream();
                // 每次读文件流的kb 
                contentLen = fs.Read(buff, 0, buffLength);

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

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

                // 关闭两个流
                strm.Close();
                fs.Close();
            }
            catch (Exception ex)
            {
                Log.WriteLogD("上传出错:" + ex.Message);
                Console.WriteLine(ex.Message);
                throw ex;
            }
            finally
            {

                fs.Close();
            }
        }

        public bool Download(string filePath, string fileName, out string errorinfo)/**/////上面的代码实现了从ftp服务器下载文件的功能
        {


            try
            {
                String onlyFileName = Path.GetFileName(fileName);
                string newFileName = filePath + "\" + onlyFileName;
                if (File.Exists(newFileName))
                {
                    errorinfo = string.Format("本地文件{0}已存在,无法下载", newFileName);
                    return false;

                }
                string url = "ftp://" + ftpServerIP + "/" + fileName;
                Connect(url);//连接  

                reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

                FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();

                Stream ftpStream = response.GetResponseStream();

                long cl = response.ContentLength;

                int bufferSize = 2048;

                int readCount;

                byte[] buffer = new byte[bufferSize];

                readCount = ftpStream.Read(buffer, 0, bufferSize);
                FileStream outputStream = new FileStream(newFileName, FileMode.Create);

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

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

                ftpStream.Close();

                outputStream.Close();

                response.Close();
                errorinfo = "";
                return true;
            }
            catch (Exception ex)
            {
                Log.WriteLogD("下载出错:" + ex.Message);
                errorinfo = string.Format("因{0},无法下载", ex.Message);
                return false;
            }
        }
      

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