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 = ;

             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, , buffLength);

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

                     contentLen = fs.Read(buff, , 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 = ;

                 int readCount;

                 byte[] buffer = new byte[bufferSize];

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

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

                     readCount = ftpStream.Read(buffer, , 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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