@SpringBootApplication

public class App extends WebMvcConfigurerAdapter{

    @Override

    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {

        super.configureMessageConverters(converters);

        FastJsonHttpMessageConverter fastConverter=new FastJsonHttpMessageConverter();

        FastJsonConfig fastJsonConfig=new FastJsonConfig();

        fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);

        fastConverter.setFastJsonConfig(fastJsonConfig);

        converters.add(fastConverter);

    }

    public static void main(String[] args) {

        SpringApplication.run(App.class,args);

    }

}

@Configuration

public class WebMvcConfig{

    @Bean

    public HttpMessageConverters fastJsonHttpMessageConverters(){

        FastJsonHttpMessageConverter fastConverter=new FastJsonHttpMessageConverter();        FastJsonConfig fastJsonConfig=new FastJsonConfig();

        fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);

        fastConverter.setFastJsonConfig(fastJsonConfig);

        HttpMessageConverter<?> converter=fastConverter;

        return new HttpMessageConverters(converter);

    }

}