基于spring webflux框架，而非springmvc

@Configuration
public class LongToStringConfig {
   

    @Bean
    public ObjectMapper objectMapper() {
   
        ObjectMapper objectMapper = new ObjectMapper();
        SimpleModule simpleModule = new SimpleModule();
        simpleModule.addSerializer(Long.class, ToStringSerializer.instance)
                .addSerializer(Long.TYPE, ToStringSerializer.instance);
        objectMapper.registerModule(simpleModule);
        return objectMapper;
    }
}

package com.diligent.cloud.open.api.gateway.config;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.reactivestreams.Publisher;
import org.springframework.beans