Switch type java Long json data after loss of accuracy, the value is changed

//定义时间格式转换器
@Bean
public MappingJackson2HttpMessageConverter jackson2HttpMessageConverter() {
    MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
 ObjectMapper mapper = new ObjectMapper();
 mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
 mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
 SimpleModule simpleModule = new SimpleModule();
 simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
 simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
 mapper.registerModule(simpleModule);
 converter.setObjectMapper(mapper);
 return converter;
}
springboot的修改