import com.jcraft.jsch.*;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Scanner;

public class Javassh {

    public static void main(String args[]) throws IOException {
        String user = "<YOUR LOGIN>";
        String password = "<YOUR PASSWORD>";
        String host = "<YOUR HOST>";
        int port = 22;
        String remoteFile = "/home/root/test.txt";

        try {
            JSch jsch = new JSch();
            Session session = jsch.getSession(user, host, port);
            session.setPassword(password);
            session.setConfig("StrictHostKeyChecking", "no");
            System.out.println("Establishing Connection...");
            session.connect();
            System.out.println("Connection established.");
            System.out.println("Crating SFTP Channel.");
            ChannelSftp sftpChannel = (ChannelSftp) session.openChannel("sftp");
            int lport;
            String rhost = "localhost";
            int rport;
            sftpChannel.connect();

            String command = "nc localhost 5000";
            Channel channel = session.openChannel("exec");
            ((ChannelExec) channel).setCommand(command);
            channel.setInputStream(null);
            ((ChannelExec) channel).setErrStream(System.err);
            InputStream in = channel.getInputStream();

            channel.connect();

            byte[] tmp = new byte[1024];
            while (true)
            {
              while (in.available() > 0)
              {
                int i = in.read(tmp, 0, 1024);
                if (i < 0)
                  break;
                System.out.print(new String(tmp, 0, i));
              }
              if (channel.isClosed())
              {
                System.out.println("exit-status: " + channel.getExitStatus());
                break;
              }
              try
              {
                Thread.sleep(1000);
              }
              catch (Exception ee)
              {
              }
            }

            channel.disconnect();

            System.out.println("SFTP Channel created.");

            InputStream inputStream = sftpChannel.get(remoteFile);

            try (Scanner scanner = new Scanner(new InputStreamReader(inputStream))) {
                while (scanner.hasNextLine()) {
                    String line = scanner.nextLine();
                    System.out.println(line);
                }
            }
        } catch (JSchException | SftpException e) {
            e.printStackTrace();
        }
    }

}