C# ftp 上传、下载、删除

 

C# ftp 上传、下载、删除

分类： [ 11 ] Ftp2012-11-02 10:36 3341人阅读 评论(0) 收藏 举报

public class FtpHelper
   {
       public static readonly FtpHelper Instance = new FtpHelper();

       /// <summary>
       /// 取得文件名
       /// </summary>
       /// <param name="ftpPath">ftp路径</param>
       /// <returns></returns>
       public string[] GetFilePath(string userId, string pwd, string ftpPath)
       {
           string[] downloadFiles;
           StringBuilder result = new StringBuilder();
           FtpWebRequest reqFTP;
           try
           {
               reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpPath));
               reqFTP.UseBinary = true;
               reqFTP.Credentials = new NetworkCredential(userId, pwd);
               reqFTP.Method = WebRequestMethods.Ftp.ListDirectory;
               reqFTP.UsePassive = false;
               WebResponse response = reqFTP.GetResponse();
               StreamReader reader = new StreamReader(response.GetResponseStream());
               string line = reader.ReadLine();
               while (line != null)
               {
                   result.Append(line);
                   result.Append("
");
                   line = reader.ReadLine();
               }
               result.Remove(result.ToString().LastIndexOf('
'), 1);
               reader.Close();
               response.Close();
               return result.ToString().Split('
');
           }
           catch (Exception ex)
           {
               downloadFiles = null;
               return downloadFiles;
           }
       }

       //ftp的上传功能
       public void Upload(string userId, string pwd, string filename, string ftpPath)
       {
           FileInfo fileInf = new FileInfo(filename);
           FtpWebRequest reqFTP;
           // 根据uri创建FtpWebRequest对象
           reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpPath + fileInf.Name));
           // ftp用户名和密码
           reqFTP.Credentials = new NetworkCredential(userId, pwd);

           reqFTP.UsePassive = false;
           // 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;
           // 指定数据传输类型
           reqFTP.UseBinary = true;
           // 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2kb
           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();
           try
           {
               // 把上传的文件写入流
               Stream strm = reqFTP.GetRequestStream();
               // 每次读文件流的2kb
               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)
           {

           }
       }

       public void Delete(string userId, string pwd, string ftpPath, string fileName)
       {
           FtpWebRequest reqFTP;
           try
           {
               reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpPath + fileName));
               reqFTP.Method = WebRequestMethods.Ftp.DeleteFile;
               reqFTP.UseBinary = true;
               reqFTP.Credentials = new NetworkCredential(userId, pwd);
               reqFTP.UsePassive = false;
               FtpWebResponse listResponse = (FtpWebResponse)reqFTP.GetResponse();
               string sStatus = listResponse.StatusDescription;
           }
           catch (Exception ex)
           {
               throw ex;
           }
       }

       //从ftp服务器上下载文件的功能
       public void Download(string userId, string pwd, string ftpPath, string filePath, string fileName)
       {
           FtpWebRequest reqFTP;
           try
           {
               FileStream outputStream = new FileStream(filePath + "\" + fileName, FileMode.Create);
               reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpPath + fileName));
               reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
               reqFTP.UseBinary = true;
               reqFTP.Credentials = new NetworkCredential(userId, pwd);
               reqFTP.UsePassive = false;
               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);
               while (readCount > 0)
               {
                   outputStream.Write(buffer, 0, readCount);
                   readCount = ftpStream.Read(buffer, 0, bufferSize);
               }
               ftpStream.Close();
               outputStream.Close();
               response.Close();


           }
           catch (Exception ex)
           {
               throw ex;
           }
       }

   }