4.2.0版本有办法统一将Long类型转成String类型返给前端吗？

在以前的老版本，加一个这个WebMvcConfig可以统一将返回前端的对象里的Long转成字符串，避免精度丢失。但是4.2.0版本，加了这个之后，会导致Knife4j文档无法打开。如果将converters.add(0, jackson2HttpMessageConverter);中的0改大，加的这个WebMvcConfig 又无法生效，有什么解决办法呢？

```
@Configuration
public class WebMvcConfig implements WebMvcConfigurer {

@Override
	public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
		MappingJackson2HttpMessageConverter jackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter();
		ObjectMapper objectMapper = jackson2HttpMessageConverter.getObjectMapper();
		objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
		SimpleDateFormat smt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		objectMapper.setDateFormat(smt);
		objectMapper.setTimeZone(TimeZone.getTimeZone("GMT+8"));
		List<MediaType> list = Lists.newArrayList();
		list.add(MediaType.APPLICATION_JSON_UTF8);
		jackson2HttpMessageConverter.setSupportedMediaTypes(list);
		SimpleModule simpleModule = new SimpleModule();
		simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
		simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
		simpleModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
		simpleModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
		objectMapper.registerModule(simpleModule);
		jackson2HttpMessageConverter.setObjectMapper(objectMapper);
		converters.add(0, jackson2HttpMessageConverter);
	}

}
```

GVP smallchill/SpringBlade

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GVPsmallchill/SpringBlade

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