@Component

public class TomcatConfig implements WebServerFactoryCustomizer<ConfigurableServletWebServerFactory> {

    @Override

    public void customize(ConfigurableServletWebServerFactory server) {

        server.setDisplayName("hello kugou");

        server.setPort(8082);

    }

}

@Component

public class ErrorConfig implements ErrorPageRegistrar {

    @Override

    public void registerErrorPages(ErrorPageRegistry registry) {

        ErrorPage error400Page = new ErrorPage(HttpStatus.BAD_REQUEST, "/error400Page");

        ErrorPage error401Page = new ErrorPage(HttpStatus.UNAUTHORIZED, "/error401Page");

        ErrorPage error404Page = new ErrorPage(HttpStatus.NOT_FOUND, "/error404Page");

        ErrorPage error500Page = new ErrorPage(HttpStatus.INTERNAL_SERVER_ERROR, "/error500Page");

        registry.addErrorPages(error400Page,error401Page,error404Page,error500Page);

    }

}