Want to make a FTP connection

I have to do an FTP connection and i don't know how


Here my code


URL u= new URL("ftp", "bd1.netc.net", -1, "/qwerty/joe/donnees/question.txt");

URLConnection c= u.openConnection();


After that i don't know what to do

I've try to open a stream to read the file but it throws me an exception (password). I don't know where i can set the password


Please help me.


thanks in advanced and sorry for my english

Hi,
Basically for an FTP connection you need to create two sockets, one control and the other data socket.
1. Creating a control socket:
Socket control = new Socket( address, 21 );
For reading and writing you need to define streams like this :
BufferedReader input = new BufferedReader(
new InputStreamReader(control.getInputStream())
);
PrintWriter output = new PrintWriter( control.getOutputStream(), true );

So, now you can read from the socket using:
System.input.readLine();
and write using:
output.println( String );
( I recommend you to read "Internet Programming" by Kris Jamsa for the FTP reply codes )

2. Next create a data socket class for transferring files, listing dir. etc.

public class DataSocket
{
Socket dataSocket;
ServerSocket dServer;


public DataSocket( ControlSocket control )
throws IOException
{
int dataPort;
dServer = new ServerSocket( 0, 5 );
dataPort = dServer.getLocalPort();
control.setPort( dataPort );
}

public void accept()
throws IOException
{
dataSocket = dServer.accept();
dServer.close();
}

public InputStream getInputStream()
throws IOException
{
return dataSocket.getInputStream();
}

public OutputStream getOutputStream()
throws IOException
{
return dataSocket.getOutputStream();
}

public void close()
throws IOException
{
dataSocket.close();
}
}

Hope this helps.

- Ashish

You could just download an already written free library of network components. The components include an ftp component that makes ftp easy. I use it and it is well done. The web site is http://www.oroinc.com. Good luck

Patrick Liechty
http://www.devseek.com