API加密要使用全局ObjectMapper,且需要定义Jackson2ObjectMapperBuilderCustomizer
@Bean
Jackson2ObjectMapperBuilderCustomizer () {
    builder -> builder.serializerByType(Long., ToStringSerializer.)
       .serializerByType(Long., ToStringSerializer.)
       .serializerByType(BigInteger., ToStringSerializer.)
       .serializerByType(BigDecimal., ToStringSerializer.);
}