import com.jcraft.jsch.*;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class SSHClient {
    public static void main(String[] args) throws JSchException, IOException {
        String endLineStr = " # "; // it is dependant to the server
        String host = ""; // host IP
        String user = ""; // username for SSH connection
        String password = ""; // password for SSH connection
        int port = 22; // default SSH port

        JSch shell = new JSch();
        // get a new session
        Session session = shell.getSession(user, host, port);

        // set user password and connect to a channel
        session.setUserInfo(new SSHUserInfo(password));
        session.connect();
        Channel channel = session.openChannel("shell");
        channel.connect();

        ChannelExec channelExec = (ChannelExec)session.openChannel("exec");

        InputStream in = channelExec.getInputStream();

        channelExec.setCommand("ls");
        channelExec.connect();

        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        String line;
        int index = 0;

        while ((line = reader.readLine()) != null)
        {
            System.out.println(++index + " : " + line);
        }

        int exitStatus = channelExec.getExitStatus();
        channelExec.disconnect();
        session.disconnect();
        if(exitStatus < 0){
            System.out.println("Done, but exit status not set!");
        }
        else if(exitStatus > 0){
            System.out.println("Done, but with error!");
        }
        else{
            System.out.println("Done!");
        }

//        DataInputStream dataIn = new DataInputStream(channel.getInputStream());
//        DataOutputStream dataOut = new DataOutputStream(channel.getOutputStream());
//
//        // send ls command to the server
//        dataOut.writeBytes("ls");
//        dataOut.flush();
//
//        // and print the response
//        String line = dataIn.readLine();
//        System.out.println(line);
//        while(!line.endsWith(endLineStr)) {
//            System.out.println(line);
//            line = dataIn.readLine();
//        }
//        dataIn.close();
//        dataOut.close();
        channel.disconnect();
        session.disconnect();
    }

    // this class implements jsch UserInfo interface for passing password to the session
    static class SSHUserInfo implements UserInfo {
        private String password;

        SSHUserInfo(String password) {
            this.password = password;
        }

        public String getPassphrase() {
            return null;
        }

        public String getPassword() {
            return password;
        }

        public boolean promptPassword(String arg0) {
            return true;
        }

        public boolean promptPassphrase(String arg0) {
            return true;
        }

        public boolean promptYesNo(String arg0) {
            return true;
        }

        public void showMessage(String arg0) {
            System.out.println(arg0);
        }
    }

}