SpringBoot全局配置long转String丢失精度问题解决方案

Z时代
2024-01-10
分类：综合

web项目中,前端JS使用Java后端传过来的Long/long会丢失精度。

后端将返回的数据改为String使用即可

第一种

自己建个配置类

extends WebMvcConfigurerAdapter 已经被弃用，直接实现WebMvcConfigurer该接口就行了


@EnableWebMvc
@Configuration
public class WebDataConvertConfig implements WebMvcConfigurer {
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
      MappingJackson2HttpMessageConverter jackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter();
      ObjectMapper objectMapper = new ObjectMapper();
      /**
       * 序列换成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
       */
      SimpleModule simpleModule = new SimpleModule();
      simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
      simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
      objectMapper.registerModule(simpleModule);
      jackson2HttpMessageConverter.setObjectMapper(objectMapper);
      converters.add(jackson2HttpMessageConverter);
    }

第二种

前提是使用Jackson2


@Configuration
public class JacksonConfig {
	/**
	 * Jackson全局转化long类型为String，解决jackson序列化时long类型缺失精度问题
	 * @return Jackson2ObjectMapperBuilderCustomizer 注入的对象
	 */
	@Bean
	public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
		Jackson2ObjectMapperBuilderCustomizer cunstomizer = new Jackson2ObjectMapperBuilderCustomizer() {
			@Override
			public void customize(Jackson2ObjectMapperBuilder jacksonObjectMapperBuilder) {
			jacksonObjectMapperBuilder.serializerByType(Long.TYPE, ToStringSerializer.instance);
				jacksonObjectMapperBuilder.serializerByType(Long.class, ToStringSerializer.instance);
			}
		};
		return cunstomizer;
	}