我們先來看代碼：

@Configurationpublic class WebMvcConfig extends WebMvcConfigurationSupport { public FastJsonHttpMessageConverter fastJsonHttpMessageConverter() { FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter(); FastJsonConfig fastJsonConfig = new FastJsonConfig(); //todo 這里進(jìn)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; }}

配置上這個(gè)可以在返回的信息中，假如說有null字段的時(shí)候，前端不會(huì)進(jìn)行顯示這種信息

知識(shí)點(diǎn)擴(kuò)展：

springboot中用fastjson處理返回值為null的屬性值

@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

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