long类型的数字太长前端精度丢失

18位数字 传到前端 171227112703436652 变成了 171227112703436640

很显然是数字太长，精度丢失了

解决方案：

/** * 序列化json时,将所有的long变成string * 因为js中得数字类型不能包含所有的java long值 */

1 将long类型变成string

  public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
    converters.add(new MappingJackson2HttpMessageConverter(
        new Jackson2ObjectMapperBuilder()
//            .propertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE)
            .serializationInclusion(
                Include.NON_NULL).serializerByType(Long.class, new JsonLong2StrConverter())
            .serializerByType(Long.TYPE, new JsonLong2StrConverter()).build()));
  }

public class JsonLong2StrConverter extends StdSerializer<Long> {

  public JsonLong2StrConverter() {
    super(Long.class);
  }

  @Override
  public void serialize(Long value, JsonGenerator gen, SerializerProvider provider)
      throws IOException {

    gen.writeString(value.toString());
  }
}