Jackson2ObjectMapperBuilderCustomizer不生效解决
不生效的原因一般是MappingJackson2HttpMessageConverter的对象在程序启动时创建了多个，我们只要将多余的去掉，并重新添加MappingJackson2HttpMessageConverter的bean就可以了
@Configuration
@ConditionalOnWebApplication(type = ConditionalOnWebApplication.Type.SERVLET)
public class ConvertConfiguration implements WebMvcConfigurer {
@Autowired(required = false)
private MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter;
@Override
public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
converters.removeIf(converter -> converter instanceof MappingJackson2HttpMessageConverter);
if (Objects.isNull(mappingJackson2HttpMessageConverter)) {
converters.add(0, new MappingJackson2HttpMessageConverter());
} else {
converters.add(0, mappingJackson2HttpMessageConverter);
}
}
}