String bd = "mibase";
        String url = "jdbc:mysql://localhost:/3306"+bd;
        String password = "admin";
        String login = "root";
        try {
            Connection conn = null;
            Class.forName("org.gjt.mm.mysql.Driver");
            conn = DriverManager.getConnection(url, login, password);
            if (conn != null)
            {
            JOptionPane.showMessageDialog(null,"Conexión a base de datos "+url+" ... Ok");
            conn.close();
            }
        } catch (SQLException ex) {
            Logger.getLogger(Prueba2.class.getName()).log(Level.SEVERE, null, ex);
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(Prueba2.class.getName()).log(Level.SEVERE, null, ex);
            JOptionPane.showMessageDialog
            (null,"Hubo un problema al intentar conectarse con la base de datos"+ex.getMessage());
        }