10-11-2009 14:54:36
[code]
public class FTPClient
{
private string remoteHost;
private string remoteUser;
private string remotePass;
private string remotePath;

private int remotePort = 21;
private int bytes;
private Socket clientSocket;

private int retValue;
private Boolean logined;
private string reply;
private string mes = "";

private static int BLOCK_SIZE = 512;

Byte[] buffer = new Byte[BLOCK_SIZE];
Encoding ASCII = Encoding.ASCII;

public FTPClient(string host, string user, string password)
{
remoteHost = host;
remoteUser = user;
remotePass = password;
Login();
}

public void Login()
{
clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPEndPoint ep = new IPEndPoint(Dns.Resolve(remoteHost).AddressList[0], remotePort);

try
{
clientSocket.Connect(ep);
}
catch (Exception)
{
throw new IOException("Couldn't connect to remote server");
}

ReadReply();
if (retValue != 220)
{
Close();
throw new IOException(reply.Substring(4));
}

SendCommand("USER " + remoteUser);
if (!(retValue == 331 || retValue == 230))
{
CleanUp();
throw new IOException(reply.Substring(4));
}

if (retValue != 230)
{
SendCommand("PASS " + remotePass);
if (!(retValue == 230 || retValue == 202))
{
CleanUp();
throw new IOException(reply.Substring(4));
}
}

logined = true;
}

private void ChangeDir(string dirName)
{
if (dirName.Equals("."))
{
return;
}

SendCommand("CWD " + dirName);

if (retValue != 250)
{
throw new IOException(reply.Substring(4));
}

this.remotePath = dirName;
}

private void ReadReply()
{
mes = "";
reply = ReadLine();
retValue = Int32.Parse(reply.Substring(0, 3));
}

private string ReadLine()
{
while (true)
{
bytes = clientSocket.Receive(buffer, buffer.Length, 0);
mes += ASCII.GetString(buffer, 0, bytes);
if (bytes < buffer.Length)
{
break;
}
}

string[] messages = mes.Split('\n');

if (mes.Length > 2)
{
mes = messages[messages.Length - 2];
}
else
{
mes = messages[0];
}

if (!mes.Substring(3, 1).Equals(" "))
{
return ReadLine();
}

return mes;
}

private void SendCommand(string command)
{
Byte[] cmdBytes = Encoding.ASCII.GetBytes((command + "\r\n").ToCharArray());
clientSocket.Send(cmdBytes, cmdBytes.Length, 0);
ReadReply();
}

public void Close()
{
if (clientSocket != null)
{
SendCommand("QUIT");
}

CleanUp();
}

public void CleanUp()
{
if (clientSocket != null)
{
clientSocket.Close();
clientSocket = null;
}
logined = false;
}

public void UploadFile(string fileName, Stream filePosted)
{
Socket cSocket = CreateDataSocket();
//long offset = 0;

//if (resume)
//{
// try
// {
// SetBinaryMode(true);
// offset = getFileSize(fileName);
// }
// catch (Exception)
// {
// offset = 0;
// }
//}

//if (offset > 0)
//{
// SendCommand("REST " + offset);
// if (retValue != 350)
// {
// offset = 0;
// }
//}

SendCommand("STOR " + fileName);

if (!(retValue == 125 || retValue == 150))
{
throw new IOException(reply.Substring(4));
}

while ((bytes = filePosted.Read(buffer, 0, buffer.Length)) > 0)
{
cSocket.Send(buffer, bytes, 0);
}

filePosted.Close();
if (cSocket.Connected)
{
cSocket.Close();
}

ReadReply();
if (!(retValue == 226 || retValue == 250))
{
throw new IOException(reply.Substring(4));
}
}

private Socket CreateDataSocket()
{
SendCommand("PASV");

if (retValue != 227)
{
throw new IOException(reply.Substring(4));
}

int index1 = reply.IndexOf('(');
int index2 = reply.IndexOf(')');
string ipData = reply.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 reply: " + reply);
}

if (ch == ',' || i + 1 == len)
{

try
{
parts[partCount++] = Int32.Parse(buf);
buf = "";
}
catch (Exception)
{
throw new IOException("Malformed PASV reply: " + reply);
}
}
}

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(Dns.Resolve(ipAddress).AddressList[0], port);

try
{
s.Connect(ep);
}
catch (Exception)
{
throw new IOException("Can't connect to remote server");
}

return s;
}

private void SetBinaryMode(bool mode)
{
if (mode)
{
SendCommand("TYPE I");
}
else
{
SendCommand("TYPE A");
}

if (retValue != 200)
{
throw new IOException(reply.Substring(4));
}
}
}
[/code]

Chia sẻ với bà con, cái này được viết trên java, có 1 chú rất chăm chỉ chuyển sang dotnet, chạy ổn định gần như không có lỗi