长整型Long返回到前端，js出现精度丢失怎么办

1. MainConfig（通常是主config类，@Configuration注解的，用来导入一些基础配置）增加MessageConvert的重写extendMessageConverters：

   @Override
   public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
       MappingJackson2HttpMessageConverter jacksonConverter = null;
       for (HttpMessageConverter<?> converter : converters) {
           if (converter instanceof MappingJackson2HttpMessageConverter) {
               jacksonConverter = (MappingJackson2HttpMessageConverter) converter;
           }
       }
       if (jacksonConverter != null) {
           jacksonConverter.setObjectMapper(new CustomObjectMapper());
           converters.add(jacksonConverter);
       }
   }

2. CustomObjectMapper的实现：

   public class CustomObjectMapper extends ObjectMapper {
   public CustomObjectMapper() {
       super();
       SimpleModule simpleModule = new SimpleModule();
       simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
       simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
       registerModule(simpleModule);
   }
   }

这样，接口返回的时候，所有的长整型字段，会被当做字符串处理，自动加上双引号。

长整型Long返回到前端，js出现精度丢失怎么办

原文：https://blog.51cto.com/10705830/2458328