ftp通用類2 - tuyile006－IT工程師數位筆記本

文章出處
using System;
using System.Net;
using System.IO;
using System.Text;
using System.Net.Sockets;

/// <summary>
/// FTPClient 的摘要說明。
/// </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="strNewFileName">新文件名</param>
public void Rename(string strOldFileName,string strNewFileName)
{
   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 "+strNewFileName);
   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的最后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(用于登錄以前)
/// </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,分隔后10后面雖沒有字符串,
    //但也會分配為空字符串給后面(也是最后一個)字符串數組,
    //所以最后一個mess是沒用的空字符串
    //但為什么不直接取mess[0],因為只有最后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,后面接一空格,再接問候字符串)
   {
    return ReadLine();
   }
   return strMsg;
}
/// <summary>
/// 發送命令并獲取應答碼和最后一行應答字符串
/// </summary>
/// <param name="strCommand">命令</param>
private void SendCommand(String strCommand)
{
            //Byte[] cmdBytes =
            // Encoding.ASCII.GetBytes((strCommand + "/r/n").ToCharArray());
            byte[] cmdBytes = Encoding.GetEncoding("gb2312").GetBytes((strCommand + "/r/n").ToCharArray());
            socketControl.Send(cmdBytes, cmdBytes.Length, 0);
            ReadReply();
} 
    #endregion 
}
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