在启动类@SpringBootApplication添加如下：
/**
* fastjson替换默认的jackjson(springmvc)
* @return
*/
@Bean
public HttpMessageConverters fastJsonHttpMessageConverters() {
FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
FastJsonConfig fastJsonConfig = new FastJsonConfig();
fastJsonConfig.setSerializerFeatures(SerializerFeature.WriteMapNullValue,
SerializerFeature.WriteNullListAsEmpty);
fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);
// 处理中文乱码问题
List<MediaType> fastMediaTypes = new ArrayList<>();
fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes);
HttpMessageConverter<?> converter = fastJsonHttpMessageConverter;
return new HttpMessageConverters(converter);
}
