无法访问区域设置消息

我在参考资料目录中定义了两个属性文件。 它们是:- 信息。属性

message.welcome=Se registro correctamente. Le enviaremos

留言。属性

message.welcome=Welcome To our main login page

现在,我正试图通过如下方式使用thymeleaf在我的html页面上访问此消息:-

<h1 th:text="#{message.welcome}"></h1>
<p>Lorem ipsum dolor sit amet consectetur adipisicing elit. 
  Obcaecati voluptatibus odio vero et quasi, incidunt quae eaque 
  maiores repellendus totam placeat autem quam eligendi ut in 
  veritatis. Dolores, repellendus dolor.</p>

和我的配置文件:-

@Configuration
public class MvcConfig implements WebMvcConfigurer {

    @Autowired
    private MessageSource messageSource;


    public MvcConfig() {
        super();
    }


    @Bean
    public LocaleResolver localeResolver(){
        SessionLocaleResolver localeResolver = new SessionLocaleResolver();
        localeResolver.setDefaultLocale(Locale.US);
        return  localeResolver;
    }


    @Bean
    public LocaleChangeInterceptor localeChangeInterceptor(){
        LocaleChangeInterceptor lci = new LocaleChangeInterceptor();
        lci.setParamName("lang");
        return lci;
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(localeChangeInterceptor());
    }

    @Override
    public Validator getValidator() {
        LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
        validator.setValidationMessageSource(messageSource);
        return validator;
    }

}

为什么没有显示欢迎信息?