问到mysql的java SSH连接访问本地主机，而不是远程主机

EN

package connectsshserver;

import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;
import java.sql.Connection;
public class MySqlConnOverSSH {
    public static void main(String[] args) throws SQLException {
        int lport=3306;
        String rhost="host47.registrar-servers.com";
        String host="host47.registrar-servers.com";
        int rport=3306;
        String user="soft123a"; //ssh user name 
        String password="123487ab"; //ssh password
        String dbuserName = "root"; 
        String dbpassword = "";
        String url = "jdbc:mysql://127.0.0.1"+"/arbaccounting"; //host+db
        String driverName="com.mysql.jdbc.Driver";
        Connection conn = null;
        Session session= null;
        try{
            //Set StrictHostKeyChecking property to no to avoid UnknownHostKey issue
            java.util.Properties config = new java.util.Properties(); 
            config.put("StrictHostKeyChecking", "no");
            JSch jsch = new JSch();
            session=jsch.getSession(user, host, 21098);
            session.setPassword(password);
            session.setConfig(config);
            session.connect();
            System.out.println("Connected");
            int assinged_port=session.setPortForwardingL(21098, rhost, 3306);
            System.out.println("127.0.0.1:"+assinged_port+" -> "+rhost+":"+rport);
            System.out.println("Port Forwarded");
            //mysql database connectivity
            Class.forName(driverName).newInstance();
            conn = DriverManager.getConnection (url, dbuserName, dbpassword);
            System.out.println ("Database connection established");
            System.out.println("DONE");
        }catch(Exception e){
            e.printStackTrace();
        }finally{
            if(conn != null && !conn.isClosed()){
                System.out.println("Closing Database Connection");
                conn.close();
            }
            if(session !=null && session.isConnected()){
                System.out.println("Closing SSH Connection");
                session.disconnect();
            }
        }
    }

}