messageについて

@Configuration
public class AppConfig {

    @Autowired
    private MessageSource messageSource;

    @Bean
    public String getMessage() {
        // プレースホルダーを置換する値の配列
        Object[] args = {"John", "Doe"};
        
        // ロケールを取得
        Locale locale = LocaleContextHolder.getLocale();

        // MessageSourceResolvableを使用してメッセージを取得
        MessageSourceResolvable resolvable = new DefaultMessageSourceResolvable("hello.message", args, "Default message", locale);
        String message = messageSource.getMessage(resolvable, locale);
        
        return message;
    }

    @Bean
    public MessageSource messageSource() {
        ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
        messageSource.setBasename("classpath:message");
        messageSource.setDefaultEncoding("UTF-8");
        return messageSource;
    }
}

@Service
public class LoggingService {

    @Autowired
    private MessageSource messageSource;

    public void logHelloMessage() {
        String helloMessage = messageSource.getMessage("logging.message.hello", null, null);
        System.out.println(helloMessage);
    }

    public void logErrorMessage(String error) {
        String errorMessage = messageSource.getMessage("logging.message.error", new Object[]{error}, null);
        System.out.println(errorMessage);
    }
}