如何序列化java.time。Spring Webflux中的即时ISO字符串

我如何配置webflux将java.time(特别是Instant)序列化为ISO日期字符串?

使用以下代码,我得到:

{"id":"id","timestamp":1606890022.131813600}

我想买

{"id":"id","timestamp":"2020-12-02T07:20:16.553Z"}

@EnableWebFlux
@SpringBootApplication
public class WebfluxJavaTimeSerializationApplication {

    public static void main(String[] args) {
        SpringApplication.run(WebfluxJavaTimeSerializationApplication.class, args);
    }
   
    @Bean
    public RouterFunction<?> routerFunction() {
        return route().GET("/resource", request -> ServerResponse.ok().body(Mono.just(new Resource()),Resource.class)).build();
    }

    public class Resource {
        String id = "id";
        Instant timestamp = Instant.now();

        public String getId() {
            return id;
        }

        public Instant getTimestamp() {
            return timestamp;
        }
    }
}

我尝试过以下配置:

@Configuration
@EnableWebFlux
public class WebConfig implements WebFluxConfigurer {
    //moved from application class
    @Bean
    public RouterFunction<?> routerFunction() {
        return route().GET("/resource", request -> ServerResponse.ok().body(Mono.just(new Resource()), Resource.class)).build();
    }


    @Override
    public void addFormatters(FormatterRegistry registry) {
        DateTimeFormatterRegistrar registrar = new DateTimeFormatterRegistrar();
        registrar.setUseIsoFormat(true);
        registrar.registerFormatters(registry);
    }

    @Override
    public void configureHttpMessageCodecs(ServerCodecConfigurer configurer) {
        ObjectMapper objectMapper = new ObjectMapper().registerModule(new JavaTimeModule());
        configurer.defaultCodecs().jackson2JsonEncoder(new Jackson2JsonEncoder(objectMapper));
        configurer.defaultCodecs().jackson2JsonDecoder(new Jackson2JsonDecoder(objectMapper));
    }

}

但它不会改变响应。我认为格式化程序仅用于WebClient的反序列化和编解码器(但可能会出错)。