[Spring boot] CommandLineRunner and Autowired

Previously we use Application Context to get Bean and Dependenies injection. It is actually easier to use 'CommonLineRunner'.

Main beneift is we can use @Autowired.

@SpringBootApplication
public class SpringAopApplication implements CommandLineRunner{
    
    private Logger logger = LoggerFactory.getLogger(this.getClass());

    @Autowired
    private Business1 business1;

    @Autowired
    private Business2 business2;
    
    public static void main(String[] args) {
        SpringApplication.run(SpringAopApplication.class, args);
    }

    @Override
    public void run(String... args) throws Exception {
        logger.info(business1.calculateSomething());
        logger.info(business2.calculateSomething());
    }
}