我们先来看代码：
@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {
public FastJsonHttpMessageConverter fastJsonHttpMessageConverter() {
FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
FastJsonConfig fastJsonConfig = new FastJsonConfig();
//todo 这里进行配置，空和null，不返回
fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
SerializeConfig serializeConfig = SerializeConfig.globalInstance;
serializeConfig.put(LocalDateTime.class, LocalDateTimeSerializer.instance);
fastJsonConfig.setSerializeConfig(serializeConfig);
List<MediaType> mediaTypeList = new ArrayList<>();
mediaTypeList.add(MediaType.APPLICATION_JSON_UTF8);
mediaTypeList.add(MediaType.APPLICATION_JSON);
fastJsonHttpMessageConverter.setSupportedMediaTypes(mediaTypeList);
fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);
return fastJsonHttpMessageConverter;
}
}
配置上这个可以在返回的信息中，假如说有null字段的时候，前端不会进行显示这种信息
知识点扩展：
springboot中用fastjson处理返回值为null的属性值
@Bean
public HttpMessageConverters fastJsonHttpMessageConverters(){
FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
FastJsonConfig fastJsonConfig = new FastJsonConfig();
fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
fastJsonConfig.setDateFormat("yyyy-MM-dd");
fastConverter.setFastJsonConfig(fastJsonConfig);
HttpMessageConverter<?> converter = fastConverter;
return new HttpMessageConverters(converter);
}
然后就可以在返回的DTO中使用fastjson的注解，比如
