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FTP網站文件到本地的C#代碼

編輯：關於C語言

using System.Net;
using System.IO;
using System.Text;
using System.Net.Sockets;

調用示例:

//調用開始:
   FTPClIEnt FtpNiuGames=new FTPClIEnt();
   FTPNiuGames.RemoteHost=textBox3.Text;
   FTPNiuGames.RemoteUser=textBox5.Text;
   FTPNiuGames.RemotePass=textBox6.Text;
   FtpNiuGames.RemotePath=txtFTPDir.Text;;
   FTPNiuGames.RemotePort=int.Parse(textBox7.Text);
   FTPNiuGames.Connect();
   textBox8.Text="成功打開FTP連接";
   //FTPNiuGames.Get("SHNiugames.mdb","c:\\");
   FtpNiuGames.Get(strFTPFile,strLocalDir);
   textBox8.Text=textBox8.Text + "\r\nFTP文件:"+strFTPDir+"文件到本地:" +strLocalFilePath+ "完成";
   FTPNiuGames.DisConnect();
   textBox8.Text=textBox8.Text + "\r\n成功關閉FTP連接";

//調用完成

/// <summary>
/// FTP ClIEnt
/// </summary>
public class FTPClIEnt
{
  #region 構造函數
  /// <summary>
  /// 缺省構造函數
  /// </summary>
  public FTPClIEnt()
  {
   strRemoteHost = "";
   strRemotePath = "";
   strRemoteUser = "";
   strRemotePass = "";
   strRemotePort = 21;
   bConnected     = false;
  }

  /// <summary>
  /// 構造函數
  /// </summary>
  /// <param name="remoteHost"></param>
  /// <param name="remotePath"></param>
  /// <param name="remoteUser"></param>
  /// <param name="remotePass"></param>
  /// <param name="remotePort"></param>
  public FTPClIEnt( string remoteHost, string remotePath, string remoteUser, string remotePass, int remotePort )
  {
   strRemoteHost = remoteHost;
   strRemotePath = remotePath;
   strRemoteUser = remoteUser;
   strRemotePass = remotePass;
   strRemotePort = remotePort;
   Connect();
  }
  #endregion

  #region 登陸
  /// <summary>
  /// FTP服務器IP地址
  /// </summary>
  private string strRemoteHost;
  public string RemoteHost
  {
   get
   {
    return strRemoteHost;
   }
   set
   {
    strRemoteHost = value;
   }
  }
  /// <summary>
  /// FTP服務器端口
  /// </summary>
  private int strRemotePort;
  public int RemotePort
  {
   get
   {
    return strRemotePort;
   }
   set
   {
    strRemotePort = value;
   }
  }
  /// <summary>
  /// 當前服務器目錄
  /// </summary>
  private string strRemotePath;
  public string RemotePath
  {
   get
   {
    return strRemotePath;
   }
   set
   {
    strRemotePath = value;
   }
  }
  /// <summary>
  /// 登錄用戶賬號
  /// </summary>
  private string strRemoteUser;
  public string RemoteUser
  {
   set
   {
    strRemoteUser = value;
   }
  }
  /// <summary>
  /// 用戶登錄密碼
  /// </summary>
  private string strRemotePass;
  public string RemotePass
  {
   set
   {
    strRemotePass = value;
   }
  }

  /// <summary>
  /// 是否登錄
  /// </summary>
  private Boolean bConnected;
  public bool Connected
  {
   get
   {
    return bConnected;
   }
  }
  #endregion

  #region 鏈接
  /// <summary>
  /// 建立連接
  /// </summary>
  public void Connect()
  {
   socketControl = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
   IPEndPoint ep = new IPEndPoint(IPAddress.Parse(RemoteHost), strRemotePort);
   // 鏈接
   try
   {
    socketControl.Connect(ep);
   }
   catch(Exception)
   {
    throw new IOException("Couldn't connect to remote server");
   }

   // 獲取應答碼
   ReadReply();
   if(iReplyCode != 220)
   {
    DisConnect();
    throw new IOException(strReply.Substring(4));
   }

   // 登陸
   SendCommand("USER "+strRemoteUser);
   if( !(iReplyCode == 331 || iReplyCode == 230) )
   {
    CloseSocketConnect();//關閉連接
    throw new IOException(strReply.Substring(4));
   }
   if( iReplyCode != 230 )
   {
    SendCommand("PASS "+strRemotePass);
    if( !(iReplyCode == 230 || iReplyCode == 202) )
    {
     CloseSocketConnect();//關閉連接
     throw new IOException(strReply.Substring(4));
    }
   }
   bConnected = true;

   // 切換到目錄
   ChDir(strRemotePath);
  }

  /// <summary>
  /// 關閉連接
  /// </summary>
  public void DisConnect()
  {
   if( socketControl != null )
   {
    SendCommand("QUIT");
   }
   CloseSocketConnect();
  }

#endregion

#region 傳輸模式

  /// <summary>
  /// 傳輸模式:二進制類型、ASCII類型
  /// </summary>
  public enum TransferType {Binary,ASCII};

  /// <summary>
  /// 設置傳輸模式
  /// </summary>
  /// <param name="ttType">傳輸模式</param>
  public void SetTransferType(TransferType ttType)
  {
   if(ttType == TransferType.Binary)
   {
    SendCommand("TYPE I");//binary類型傳輸
   }
   else
   {
    SendCommand("TYPE A");//ASCII類型傳輸
   }
   if (iReplyCode != 200)
   {
    throw new IOException(strReply.Substring(4));
   }
   else
   {
    trType = ttType;
   }
  }

  /// <summary>
  /// 獲得傳輸模式
  /// </summary>
  /// <returns>傳輸模式</returns>
  public TransferType GetTransferType()
  {
   return trType;
  }

  #endregion

  #region 文件操作
  /// <summary>
  /// 獲得文件列表
  /// </summary>
  /// <param name="strMask">文件名的匹配字符串</param>
  /// <returns></returns>
  public string[] Dir(string strMask)
  {
   // 建立鏈接
   if(!bConnected)
   {
    Connect();
   }

   //建立進行數據連接的socket
   Socket socketData = CreateDataSocket();

   //傳送命令
   SendCommand("NLST " + strMask);

   //分析應答代碼
   if(!(iReplyCode == 150 || iReplyCode == 125 || iReplyCode == 226))
   {
    throw new IOException(strReply.Substring(4));
   }

   //獲得結果
   strMsg = "";
   while(true)
   {
    int iBytes = socketData.Receive(buffer, buffer.Length, 0);
    strMsg += ASCII.GetString(buffer, 0, iBytes);
    if(iBytes < buffer.Length)
    {
     break;
    }
   }
   char[] seperator = {'\n'};
   string[] strsFileList = strMsg.Split(seperator);
   socketData.Close();//數據socket關閉時也會有返回碼
   if(iReplyCode != 226)
   {
    ReadReply();
    if(iReplyCode != 226)
    {
     throw new IOException(strReply.Substring(4));
    }
   }
   return strsFileList;
  }

  /// <summary>
  /// 獲取文件大小
  /// </summary>
  /// <param name="strFileName">文件名</param>
  /// <returns>文件大小</returns>
  private long GetFileSize(string strFileName)
  {
   if(!bConnected)
   {
    Connect();
   }
   SendCommand("SIZE " + Path.GetFileName(strFileName));
   long lSize=0;
   if(iReplyCode == 213)
   {
    lSize = Int64.Parse(strReply.Substring(4));
   }
   else
   {
    throw new IOException(strReply.Substring(4));
   }
   return lSize;
  }

  /// <summary>
  /// 刪除
  /// </summary>
  /// <param name="strFileName">待刪除文件名</param>
  public void Delete(string strFileName)
  {
   if(!bConnected)
   {
    Connect();
   }
   SendCommand("DELE "+strFileName);
   if(iReplyCode != 250)
   {
    throw new IOException(strReply.Substring(4));
   }
  }

  /// <summary>
  /// 重命名(如果新文件名與已有文件重名,將覆蓋已有文件)
  /// </summary>
  /// <param name="strOldFileName">舊文件名</param>
  /// <param name="str C#下載文件時候彈出選擇文件夾保存目錄的代碼 C#根據計算機名獲取對應IP地址 C#獲取網絡鄰居所有工作組和機器名稱 C#列表所有IIS站點以及相關站點屬性 c#讀取IIS中的站點相關屬性代碼 C#新建站點,刪除站點函數代碼 C#下在圖片文件到本地,c#,c#下載,下載圖片,下載文件,下載函數 C#根據網址獲取域名,目錄名,文件名函數 c#獲取本機電腦相關信息 FTP網站文件到本地的C#代碼 c#保存文件時候的彈出選擇要保存的文件夾帶新建文件夾效果的類代碼 C#中調用對應的應用程打開文件序的代碼數據表文件導出Execel文件-本地測試成功 C#新保存文件時候用到按日期時間命名的代碼 C#根據網址抓取目錄和文件名的兩個函數 C#下載文件函數 C#用線程傳參下載文件的代碼 c#使用線程下載文件的控制技巧和缺陷 ASP.Net中安裝使用OWC組件生成EXECEL步驟批量抓取網頁代碼中的HTTP和郵件地址，IO，正則表達式，抓網頁源碼Name">新文件名</param>
  public void Rename(string strOldFileName,string str C#下載文件時候彈出選擇文件夾保存目錄的代碼 C#根據計算機名獲取對應IP地址 C#獲取網絡鄰居所有工作組和機器名稱 C#列表所有IIS站點以及相關站點屬性 c#讀取IIS中的站點相關屬性代碼 C#新建站點,刪除站點函數代碼 C#下在圖片文件到本地,c#,c#下載,下載圖片,下載文件,下載函數 C#根據網址獲取域名,目錄名,文件名函數 c#獲取本機電腦相關信息 FTP網站文件到本地的C#代碼 c#保存文件時候的彈出選擇要保存的文件夾帶新建文件夾效果的類代碼 C#中調用對應的應用程打開文件序的代碼數據表文件導出Execel文件-本地測試成功 C#新保存文件時候用到按日期時間命名的代碼 C#根據網址抓取目錄和文件名的兩個函數 C#下載文件函數 C#用線程傳參下載文件的代碼 c#使用線程下載文件的控制技巧和缺陷 ASP.Net中安裝使用OWC組件生成EXECEL步驟批量抓取網頁代碼中的HTTP和郵件地址，IO，正則表達式，抓網頁源碼Name)
  {
   if(!bConnected)
   {
    Connect();
   }
   SendCommand("RNFR "+strOldFileName);
   if(iReplyCode != 350)
   {
    throw new IOException(strReply.Substring(4));
   }
   // 如果新文件名與原有文件重名,將覆蓋原有文件
   SendCommand("RNTO "+str C#下載文件時候彈出選擇文件夾保存目錄的代碼 C#根據計算機名獲取對應IP地址 C#獲取網絡鄰居所有工作組和機器名稱 C#列表所有IIS站點以及相關站點屬性 c#讀取IIS中的站點相關屬性代碼 C#新建站點,刪除站點函數代碼 C#下在圖片文件到本地,c#,c#下載,下載圖片,下載文件,下載函數 C#根據網址獲取域名,目錄名,文件名函數 c#獲取本機電腦相關信息 FTP網站文件到本地的C#代碼 c#保存文件時候的彈出選擇要保存的文件夾帶新建文件夾效果的類代碼 C#中調用對應的應用程打開文件序的代碼數據表文件導出Execel文件-本地測試成功 C#新保存文件時候用到按日期時間命名的代碼 C#根據網址抓取目錄和文件名的兩個函數 C#下載文件函數 C#用線程傳參下載文件的代碼 c#使用線程下載文件的控制技巧和缺陷 ASP.Net中安裝使用OWC組件生成EXECEL步驟批量抓取網頁代碼中的HTTP和郵件地址，IO，正則表達式，抓網頁源碼Name);
   if(iReplyCode != 250)
   {
    throw new IOException(strReply.Substring(4));
   }
  }
  #endregion

  #region 上傳和下載
  /// <summary>
  /// 下載一批文件
  /// </summary>
  /// <param name="strFileNameMask">文件名的匹配字符串</param>
  /// <param name="strFolder">本地目錄(不得以\結束)</param>
  public void Get(string strFileNameMask,string strFolder)
  {
   if(!bConnected)
   {
    Connect();
   }
   string[] strFiles = Dir(strFileNameMask);
   foreach(string strFile in strFiles)
   {
    if(!strFile.Equals(""))//一般來說strFiles的最後一個元素可能是空字符串
    {
     Get(strFile,strFolder,strFile);
    }
   }
  }

  /// <summary>
  /// 下載一個文件
  /// </summary>
  /// <param name="strRemoteFileName">要下載的文件名</param>
  /// <param name="strFolder">本地目錄(不得以\結束)</param>
  /// <param name="strLocalFileName">保存在本地時的文件名</param>
  public void Get(string strRemoteFileName,string strFolder,string strLocalFileName)
  {
   if(!bConnected)
   {
    Connect();
   }
   SetTransferType(TransferType.Binary);
   if (strLocalFileName.Equals(""))
   {
    strLocalFileName = strRemoteFileName;
   }
   if(!File.Exists(strLocalFileName))
   {
    Stream st = File.Create(strLocalFileName);
    st.Close();
   }
   FileStream output = new
    FileStream(strFolder + "\\" + strLocalFileName,FileMode.Create);
   Socket socketData = CreateDataSocket();
   SendCommand("RETR " + strRemoteFileName);
   if(!(iReplyCode == 150 || iReplyCode == 125
    || iReplyCode == 226 || iReplyCode == 250))
   {
    throw new IOException(strReply.Substring(4));
   }
   while(true)
   {
    int iBytes = socketData.Receive(buffer, buffer.Length, 0);
    output.Write(buffer,0,iBytes);
    if(iBytes <= 0)
    {
     break;
    }
   }
   output.Close();
   if (socketData.Connected)
   {
    socketData.Close();
   }
   if(!(iReplyCode == 226 || iReplyCode == 250))
   {
    ReadReply();
    if(!(iReplyCode == 226 || iReplyCode == 250))
    {
     throw new IOException(strReply.Substring(4));
    }
   }
  }

  /// <summary>
  /// 上傳一批文件
  /// </summary>
  /// <param name="strFolder">本地目錄(不得以\結束)</param>
  /// <param name="strFileNameMask">文件名匹配字符(可以包含*和?)</param>
  public void Put(string strFolder,string strFileNameMask)
  {
   string[] strFiles = Directory.GetFiles(strFolder,strFileNameMask);
   foreach(string strFile in strFiles)
   {
    //strFile是完整的文件名(包含路徑)
    Put(strFile);
   }
  }

  /// <summary>
  /// 上傳一個文件
  /// </summary>
  /// <param name="strFileName">本地文件名</param>
  public void Put(string strFileName)
  {
   if(!bConnected)
   {
    Connect();
   }
   Socket socketData = CreateDataSocket();
   SendCommand("STOR "+Path.GetFileName(strFileName));
   if( !(iReplyCode == 125 || iReplyCode == 150) )
   {
    throw new IOException(strReply.Substring(4));
   }
   FileStream input = new
    FileStream(strFileName,FileMode.Open);
   int iBytes = 0;
   while ((iBytes = input.Read(buffer,0,buffer.Length)) > 0)
   {
    socketData.Send(buffer, iBytes, 0);
   }
   input.Close();
   if (socketData.Connected)
   {
    socketData.Close();
   }
   if(!(iReplyCode == 226 || iReplyCode == 250))
   {
    ReadReply();
    if(!(iReplyCode == 226 || iReplyCode == 250))
    {
     throw new IOException(strReply.Substring(4));
    }
   }
  }

  #endregion

  #region 目錄操作
  /// <summary>
  /// 創建目錄
  /// </summary>
  /// <param name="strDirName">目錄名</param>
  public void MkDir(string strDirName)
  {
   if(!bConnected)
   {
    Connect();
   }
   SendCommand("MKD "+strDirName);
   if(iReplyCode != 257)
   {
    throw new IOException(strReply.Substring(4));
   }
  }


  /// <summary>
  /// 刪除目錄
  /// </summary>
  /// <param name="strDirName">目錄名</param>
  public void RmDir(string strDirName)
  {
   if(!bConnected)
   {
    Connect();
   }
   SendCommand("RMD "+strDirName);
   if(iReplyCode != 250)
   {
    throw new IOException(strReply.Substring(4));
   }
  }


  /// <summary>
  /// 改變目錄
  /// </summary>
  /// <param name="strDirName">新的工作目錄名</param>
  public void ChDir(string strDirName)
  {
   if(strDirName.Equals(".") || strDirName.Equals(""))
   {
    return;
   }
   if(!bConnected)
   {
    Connect();
   }
   SendCommand("CWD "+strDirName);
   if(iReplyCode != 250)
   {
    throw new IOException(strReply.Substring(4));
   }
   this.strRemotePath = strDirName;
  }

  #endregion

  #region 內部變量
  /// <summary>
  /// 服務器返回的應答信息(包含應答碼)
  /// </summary>
  private string strMsg;
  /// <summary>
  /// 服務器返回的應答信息(包含應答碼)
  /// </summary>
  private string strReply;
  /// <summary>
  /// 服務器返回的應答碼
  /// </summary>
  private int iReplyCode;
  /// <summary>
  /// 進行控制連接的socket
  /// </summary>
  private Socket socketControl;
  /// <summary>
  /// 傳輸模式
  /// </summary>
  private TransferType trType;
  /// <summary>
  /// 接收和發送數據的緩沖區
  /// </summary>
  private static int BLOCK_SIZE = 512;
  Byte[] buffer = new Byte[BLOCK_SIZE];
  /// <summary>
  /// 編碼方式
  /// </summary>
  Encoding ASCII = Encoding.ASCII;
  #endregion

  #region 內部函數
  /// <summary>
  /// 將一行應答字符串記錄在strReply和strMsg
  /// 應答碼記錄在iReplyCode
  /// </summary>
  private void ReadReply()
  {
   strMsg = "";
   strReply = ReadLine();
   iReplyCode = Int32.Parse(strReply.Substring(0,3));
  }

  /// <summary>
  /// 建立進行數據連接的socket
  /// </summary>
  /// <returns>數據連接socket</returns>
  private Socket CreateDataSocket()
  {
   SendCommand("PASV");
   if(iReplyCode != 227)
   {
    throw new IOException(strReply.Substring(4));
   }
   int index1 = strReply.IndexOf('(');
   int index2 = strReply.IndexOf(')');
   string ipData =
    strReply.Substring(index1+1,index2-index1-1);
   int[] parts = new int[6];
   int len = ipData.Length;
   int partCount = 0;
   string buf="";
   for (int i = 0; i < len && partCount <= 6; i++)
   {
    char ch = Char.Parse(ipData.Substring(i,1));
    if (Char.IsDigit(ch))
     buf+=ch;
    else if (ch != ',')
    {
     throw new IOException("Malformed PASV strReply: " +
      strReply);
    }
    if (ch == ',' || i+1 == len)
    {
     try
     {
      parts[partCount++] = Int32.Parse(buf);
      buf="";
     }
     catch (Exception)
     {
      throw new IOException("Malformed PASV strReply: " +
       strReply);
     }
    }
   }
   string ipAddress = parts[0] + "."+ parts[1]+ "." +
    parts[2] + "." + parts[3];
   int port = (parts[4] << 8) + parts[5];
   Socket s = new
    Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
   IPEndPoint ep = new
    IPEndPoint(IPAddress.Parse(ipAddress), port);
   try
   {
    s.Connect(ep);
   }
   catch(Exception)
   {
    throw new IOException("Can't connect to remote server");
   }
   return s;
  }

  /// <summary>
  /// 關閉socket連接(用於登錄以前)
  /// </summary>
  private void CloseSocketConnect()
  {
   if(socketControl!=null)
   {
    socketControl.Close();
    socketControl = null;
   }
   bConnected = false;
  }

  /// <summary>
  /// 讀取Socket返回的所有字符串
  /// </summary>
  /// <returns>包含應答碼的字符串行</returns>
  private string ReadLine()
  {
   while(true)
   {
    int iBytes = socketControl.Receive(buffer, buffer.Length, 0);
    strMsg += ASCII.GetString(buffer, 0, iBytes);
    if(iBytes < buffer.Length)
    {
     break;
    }
   }
   char[] seperator = {'\n'};
   string[] mess = strMsg.Split(seperator);
   if(strMsg.Length > 2)
   {
    strMsg = mess[mess.Length-2];
    //seperator[0]是10,換行符是由13和0組成的,分隔後10後面雖沒有字符串,
    //但也會分配為空字符串給後面(也是最後一個)字符串數組,
    //所以最後一個mess是沒用的空字符串
    //但為什麼不直接取mess[0],因為只有最後一行字符串應答碼與信息之間有空格
   }
   else
   {
    strMsg = mess[0];
   }
   if(!strMsg.Substring(3,1).Equals(" "))//返回字符串正確的是以應答碼(如220開頭,後面接一空格,再接問候字符串)
   {
    return ReadLine();
   }
   return strMsg;
  }

  /// <summary>
  /// 發送命令並獲取應答碼和最後一行應答字符串
  /// </summary>
  /// <param name="strCommand">命令</param>
  private void SendCommand(String strCommand)
  {
   Byte[] cmdBytes =
    Encoding.ASCII.GetBytes((strCommand+"\r\n").ToCharArray());
   socketControl.Send(cmdBytes, cmdBytes.Length, 0);
   ReadReply();
  }

#endregion
}