Java operation SSH2 to implement remote execution of linux commands

<dependency>
    <groupId></groupId>
    <artifactId>ganymed-ssh2</artifactId>
    <version>262</version>
</dependency>

import .;
import .;

import ;
import ;
import ;
import ;

public class SSH2Util {

    //Specify the default encoding    private static String DEFAULT_CHARSET = "UTF-8";

    /**
      * EstablishSSH2connect
      * @param host Host address
      * @param username username
      * @param password password
      * @return Connection
      */
    public static Connection openConnection(String host,String username,String password) {
        try {
            Connection connection = new Connection(host);
            //Create ssh2 connection            ();
            //Check the username            boolean login = (username,password);
            if (login){
                (host + "Connected successfully");
                return connection;
            }else {
                throw new RuntimeException(host + "Username and password are incorrect");
            }
        } catch (Exception e) {
            throw new RuntimeException(host +" "+ e);
        }
    }

    /**
      * Execute the command
      * @param connection ssh2 connection object
      * @param command command statement
      * @return Execution result, encapsulate execution status and execution result
      */
    public static ExecCmdResult execCommand(Connection connection,String command){
        ExecCmdResult execCmdResult = new ExecCmdResult();
        Session session = null;
        try{
            session = ();
            //Execute the command            (command);
            //Analysis results            String result = parseResult(());
            //The parsing result is empty, which means that an error occurred in the execution command. Trying to parse the error to output the output            if (result == null||()==0){
                result = parseResult(());

            }else {
                (true);
            }
            //Set response results            (result);
            (command + " ==>> " +());
            return execCmdResult;

        }catch (Exception e){
            ();
        }
        return null;
    }

    public static String parseResult(InputStream inputStream) throws IOException{
        //Read the output stream content        BufferedReader br = new BufferedReader(new InputStreamReader(inputStream,DEFAULT_CHARSET));
        StringBuffer resultSB = new StringBuffer();
        String line;
        while((line = ()) != null){
            (line+"\n");
        }
        //Replace newline characters        String result = ().replaceAll("[\\t\\n\\r]", "");
        return result;

    }
}

public class ExecCmdResult {

    //Whether the command execution is successful    private boolean flag ;
    //Output result    private String result;

    public void setFlag(boolean success){
         = success;
    }

    public boolean getFlag() {
        return flag;
    }

    public String getResult(){
        return result;
    }
    public void setResult(String result){
         = result;
    }

}

import .;

public class SSH2Demo {

    public static void main(String[] args) {
        try {
            String host = "168.192.22.7";
            String username = "root";
            String password = "123456";
            Connection connection = (host,username,password);
            String cpuInfo = "cat /proc/cpuinfo | grep \"cpu cores\" | uniq"; // Server number            ExecCmdResult cup = (connection,cpuInfo);
            ();
        }
        catch (Exception a){
            ();
        }
    }
}