using System;
using System.Net;
using System.IO;
using System.Text;
using System.Net.Sockets;
/// <summary>
/// FTPClient 的摘要说明。
/// </summary>
public class FTPClient
{
#region 构造函数
/// <summary>
/// 缺省构造函数
/// </summary>
public FTPClient()
{
strRemoteHost = "";
strRemotePath = "";
strRemoteUser = "";
strRemotePass = "";
strRemotePort = 21;
bConnected = false;
} /// <summary>
/// 构造函数
/// </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 登陆
/// <summary>
/// FTP服务器IP地址
/// </summary>
private string strRemoteHost;
public string RemoteHost
{
get
{
return strRemoteHost;
}
set
{
strRemoteHost = value;
}
}
/// <summary>
/// FTP服务器端口
/// </summary>
private int strRemotePort;
public int RemotePort
{
get
{
return strRemotePort;
}
set
{
strRemotePort = value;
}
}
/// <summary>
/// 当前服务器目录
/// </summary>
private string strRemotePath;
public string RemotePath
{
get
{
return strRemotePath;
}
set
{
strRemotePath = value;
}
}
/// <summary>
/// 登录用户账号
/// </summary>
private string strRemoteUser;
public string RemoteUser
{
set
{
strRemoteUser = value;
}
}
/// <summary>
/// 用户登录密码
/// </summary>
private string strRemotePass;
public string RemotePass
{
set
{
strRemotePass = value;
}
} /// <summary>
/// 是否登录
/// </summary>
private Boolean bConnected;
public bool Connected
{
get
{
return bConnected;
}
}
#endregion
#region 链接
/// <summary>
/// 建立连接
/// </summary>
public void Connect()
{
socketControl = new Socket( AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp );
IPEndPoint ep = new IPEndPoint( IPAddress.Parse( RemoteHost ), strRemotePort );
// 链接
try
{
socketControl.Connect( ep );
}
catch( Exception )
{
throw new IOException( "Couldn't connect to remote server" );
} // 获取应答码
ReadReply();
if( iReplyCode != 220 )
{
DisConnect();
throw new IOException( strReply.Substring( 4 ) );
} // 登陆
SendCommand( "USER " + strRemoteUser );
if( !( iReplyCode == 331 || iReplyCode == 230 ) )
{
CloseSocketConnect();//关闭连接
throw new IOException( strReply.Substring( 4 ) );
}
if( iReplyCode != 230 )
{
SendCommand( "PASS " + strRemotePass );
if( !( iReplyCode == 230 || iReplyCode == 202 ) )
{
CloseSocketConnect();//关闭连接
throw new IOException( strReply.Substring( 4 ) );
}
}
bConnected = true; // 切换到目录
ChDir( strRemotePath );
}
/// <summary>
/// 关闭连接
/// </summary>
public void DisConnect()
{
if( socketControl != null )
{
SendCommand( "QUIT" );
}
CloseSocketConnect();
}
#endregion
#region 传输模式
/// <summary>
/// 传输模式:二进制类型、ASCII类型
/// </summary>
public enum TransferType { Binary, ASCII }; /// <summary>
/// 设置传输模式
/// </summary>
/// <param name="ttType">传输模式</param>
public void SetTransferType( TransferType ttType )
{
if( ttType == TransferType.Binary )
{
SendCommand( "TYPE I" );//binary类型传输
}
else
{
SendCommand( "TYPE A" );//ASCII类型传输
}
if( iReplyCode != 200 )
{
throw new IOException( strReply.Substring( 4 ) );
}
else
{
trType = ttType;
}
}
/// <summary>
/// 获得传输模式
/// </summary>
/// <returns>传输模式</returns>
public TransferType GetTransferType()
{
return trType;
}
#endregion
#region 文件操作
/// <summary>
/// 获得文件列表
/// </summary>
/// <param name="strMask">文件名的匹配字符串</param>
/// <returns></returns>
public string[] Dir( string strMask )
{
// 建立链接
if( !bConnected )
{
Connect();
} //建立进行数据连接的socket
Socket socketData = CreateDataSocket();
//传送命令
SendCommand( "NLST " + strMask ); //分析应答代码
if( !( iReplyCode == 150 || iReplyCode == 125 || iReplyCode == 226 ) )
{
throw new IOException( strReply.Substring( 4 ) );
} //获得结果
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();//数据socket关闭时也会有返回码
if( iReplyCode != 226 )
{
ReadReply();
if( iReplyCode != 226 )
{
throw new IOException( strReply.Substring( 4 ) );
}
}
return strsFileList;
}
/// <summary>
/// 获取文件大小
/// </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>
/// 删除
/// </summary>
/// <param name="strFileName">待删除文件名</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(如果新文件名与已有文件重名,将覆盖已有文件)
/// </summary>
/// <param name="strOldFileName">旧文件名</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 ) );
}
// 如果新文件名与原有文件重名,将覆盖原有文件
SendCommand( "RNTO " + strNewFileName );
if( iReplyCode != 250 )
{
throw new IOException( strReply.Substring( 4 ) );
}
}
#endregion
#region 目录操作
/// <summary>
/// 创建目录
/// </summary>
/// <param name="strDirName">目录名</param>
public void MkDir( string strDirName )
{
if( !bConnected )
{
Connect();
}
SendCommand( "MKD " + strDirName );
if( iReplyCode != 257 )
{
throw new IOException( strReply.Substring( 4 ) );
}
}
/// <summary>
/// 删除目录
/// </summary>
/// <param name="strDirName">目录名</param>
public void RmDir( string strDirName )
{
if( !bConnected )
{
Connect();
}
SendCommand( "RMD " + strDirName );
if( iReplyCode != 250 )
{
throw new IOException( strReply.Substring( 4 ) );
}
}
/// <summary>
/// 改变目录
/// </summary>
/// <param name="strDirName">新的工作目录名</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 上传和下载
/// <summary>
/// 下载一批文件
/// </summary>
/// <param name="strFileNameMask">文件名的匹配字符串</param>
/// <param name="strFolder">本地目录(不得以\结束)</param>
public void Get( string strFileNameMask, string strFolder )
{
if( !bConnected )
{
Connect();
}
string[] strFiles = Dir( strFileNameMask );
foreach( string strFile in strFiles )
{
if( !strFile.Equals( "" ) )//一般来说strFiles的最后一个元素可能是空字符串
{
Get( strFile, strFolder, strFile );
}
}
}
/// <summary>
/// 下载一个文件
/// </summary>
/// <param name="strRemoteFileName">要下载的文件名</param>
/// <param name="strFolder">本地目录(不得以\结束)</param>
/// <param name="strLocalFileName">保存在本地时的文件名</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>
/// 上传一批文件
/// </summary>
/// <param name="strFolder">本地目录(不得以\结束)</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(包含路径)
Put( strFile );
}
}
/// <summary>
/// 上传一个文件
/// </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 内部函数
/// <summary>
/// 将一行应答字符串记录在strReply和strMsg
/// 应答码记录在iReplyCode
/// </summary>
private void ReadReply()
{
strMsg = "";
strReply = ReadLine();
iReplyCode = Int32.Parse( strReply.Substring( 0, 3 ) );
} /// <summary>
/// 建立进行数据连接的socket
/// </summary>
/// <returns>数据连接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>
/// 关闭socket连接(用于登录以前)
/// </summary>
private void CloseSocketConnect()
{
if( socketControl != null )
{
socketControl.Close();
socketControl = null;
}
bConnected = false;
}
/// <summary>
/// 读取Socket返回的所有字符串
/// </summary>
/// <returns>包含应答码的字符串行</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,换行符是由13和0组成的,分隔后10后面虽没有字符串,
//但也会分配为空字符串给后面(也是最后一个)字符串数组,
//所以最后一个mess是没用的空字符串
//但为什么不直接取mess[0],因为只有最后一行字符串应答码与信息之间有空格
}
else
{
strMsg = mess[0];
}
if( !strMsg.Substring( 3, 1 ).Equals( " " ) )//返回字符串正确的是以应答码(如220开头,后面接一空格,再接问候字符串)
{
return ReadLine();
}
return strMsg;
}
/// <summary>
/// 发送命令并获取应答码和最后一行应答字符串
/// </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
#region 内部变量
/// <summary>
/// 服务器返回的应答信息(包含应答码)
/// </summary>
private string strMsg;
/// <summary>
/// 服务器返回的应答信息(包含应答码)
/// </summary>
private string strReply;
/// <summary>
/// 服务器返回的应答码
/// </summary>
private int iReplyCode;
/// <summary>
/// 进行控制连接的socket
/// </summary>
private Socket socketControl;
/// <summary>
/// 传输模式
/// </summary>
private TransferType trType;
/// <summary>
/// 接收和发送数据的缓冲区
/// </summary>
private static int BLOCK_SIZE = 512;
Byte[] buffer = new Byte[BLOCK_SIZE];
/// <summary>
/// 编码方式
/// </summary>
Encoding ASCII = Encoding.ASCII;
#endregion
}
