@Configuration

public class FastjsonConfig {

    @Bean

    public HttpMessageConverters fastJsonHttpMessageConverters() {

        //1.需要定义一个convert转换消息的对象;

        FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();

        //2:添加fastJson的配置信息;

        FastJsonConfig fastJsonConfig = new FastJsonConfig();

        fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);

        //3处理中文乱码问题

        List<MediaType> fastMediaTypes = new ArrayList<>();

        fastMediaTypes.add(MediaType.APPLICATION_JSON);

        //4.在convert中添加配置信息.

        fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes);

        fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);

        fastJsonConfig.setSerializerFeatures(

                SerializerFeature.DisableCircularReferenceDetect,

                SerializerFeature.WriteMapNullValue,

                SerializerFeature.WriteNullStringAsEmpty,

                SerializerFeature.WriteNullListAsEmpty,

                SerializerFeature.WriteDateUseDateFormat);

        fastJsonConfig.setDateFormat("yyyy-MM-dd HH:mm:ss");

        return new HttpMessageConverters(fastJsonHttpMessageConverter);

    }

}