/*
* SSHManager
*
* @author cabbott
* @version 1.0
*/


import com.jcraft.jsch.*;
import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Level;
import java.util.logging.Logger;

public class SSHManager {
    private static final Logger LOGGER = Logger.getLogger(SSHManager.class.getName());
    private JSch jschSSHChannel;
    private String strUserName;
    private String strConnectionIP;
    private int intConnectionPort;
    private String strPassword;
    private Session sesConnection;
    private int intTimeOut;

    private void doCommonConstructorActions(String userName, String password, String connectionIP, String knownHostsFileName) {
        jschSSHChannel = new JSch();

        try {
            jschSSHChannel.setKnownHosts(knownHostsFileName);
        } catch (JSchException jschX) {
            logError(jschX.getMessage());
        }

        strUserName = userName;
        strPassword = password;
        strConnectionIP = connectionIP;
    }

    public SSHManager(String userName, String password, String connectionIP, String knownHostsFileName) {
        doCommonConstructorActions(userName, password, connectionIP, knownHostsFileName);
        intConnectionPort = 22;
        intTimeOut = 60000;
    }

    public SSHManager(String userName, String password, String connectionIP, String knownHostsFileName, int connectionPort) {
        doCommonConstructorActions(userName, password, connectionIP, knownHostsFileName);
        intConnectionPort = connectionPort;
        intTimeOut = 60000;
    }

    public SSHManager(String userName, String password, String connectionIP, String knownHostsFileName, int connectionPort, int timeOutMilliseconds) {
        doCommonConstructorActions(userName, password, connectionIP, knownHostsFileName);
        intConnectionPort = connectionPort;
        intTimeOut = timeOutMilliseconds;
    }

    public String connect() {
        String errorMessage = null;

        try {
            sesConnection = jschSSHChannel.getSession(strUserName, strConnectionIP, intConnectionPort);
            sesConnection.setPassword(strPassword);
            // UNCOMMENT THIS FOR TESTING PURPOSES, BUT DO NOT USE IN PRODUCTION
             sesConnection.setConfig("StrictHostKeyChecking", "no");
            sesConnection.connect(intTimeOut);
        } catch (JSchException jschX) {
            errorMessage = jschX.getMessage();
        }

        return errorMessage;
    }

    private String logError(String errorMessage) {
        if (errorMessage != null) {
            LOGGER.log(Level.SEVERE, "{0}:{1} - {2}", new Object[] { strConnectionIP, intConnectionPort, errorMessage });
        }

        return errorMessage;
    }

    private String logWarning(String warnMessage) {
        if (warnMessage != null) {
            LOGGER.log(Level.WARNING, "{0}:{1} - {2}", new Object[] { strConnectionIP, intConnectionPort, warnMessage });
        }

        return warnMessage;
    }

    public String sendCommand(String command) {
        StringBuilder outputBuffer = new StringBuilder();

        try {
            Channel channel = sesConnection.openChannel("exec");
            ((ChannelExec) channel).setCommand(command);
            InputStream commandOutput = channel.getInputStream();
            channel.connect();
            int readByte = commandOutput.read();

            while (readByte != 0xffffffff) {
                outputBuffer.append((char) readByte);
                readByte = commandOutput.read();
            }

            channel.disconnect();
        } catch (IOException ioX) {
            logWarning(ioX.getMessage());
            return null;
        } catch (JSchException jschX) {
            logWarning(jschX.getMessage());
            return null;
        }

        return outputBuffer.toString();
    }

    public void close() {
        sesConnection.disconnect();
    }

}

public class MainClass {
  public static void main (String args[])
  {

     String DIR = "ROOT_ADDRESS";
     String command1= "cd " + DIR;
     String command2 = "java -jar JAR_FILE";
     String command = command1 + " && " + command2;

     //System.out.println(command2);
     String userName = "USERNAME";
     String password = "PASSWORD";
     String connectionIP = "127.0.0.1";
     SSHManager instance = new SSHManager(userName, password, connectionIP, "");
     String errorMessage = instance.connect();


     if(errorMessage != null)
     {
        System.out.println(errorMessage);
        System.exit(1);
     }

     System.out.println(command);
     String result = instance.sendCommand(command);

     instance.close();

     System.out.println(result);
  }
}