SpringBoot Long型数据JSON序列化损失精度

SpringBoot JSON库默认采用 JACKSON。

1、Jackson

@JsonComponent
public class JsonConfig {
    @Bean
    public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
        /**
         * 可配置项：
         * 1.Include.Include.ALWAYS : 默认
         * 2.Include.NON_DEFAULT : 默认值不序列化
         * 3.Include.NON_EMPTY : 属性为 空（""） 或者为 NULL 都不序列化
         * 4.Include.NON_NULL : 属性为NULL 不序列化
         **/
        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

        /**
         * 序列化时,将所有的long变成string
         */
        SimpleModule module = new SimpleModule();
        module.addSerializer(Long.class, ToStringSerializer.instance);
        module.addSerializer(Long.TYPE, ToStringSerializer.instance);
        objectMapper.registerModule(module);
        return objectMapper;
    }
}

参考：https://blog.csdn.net/nicolas12/article/details/83342151

2、FastJson

    org.springframework.boot
    spring-boot-starter-web
    
        
        
            com.fasterxml.jackson.core
            jackson-databind
        
    



 
     com.alibaba
     fastjson
     ${fastjson.version}
 

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {

    /**
     * 利用fastJson替换掉jackson，且解决中文乱码问题
     */
    @Override
    public void configureMessageConverters(List> converters){
        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(
                SerializerFeature.DisableCircularReferenceDetect,
                SerializerFeature.WriteMapNullValue,
                SerializerFeature.WriteNullNumberAsZero,
                SerializerFeature.WriteNullStringAsEmpty,
                SerializerFeature.WriteNullListAsEmpty,
                SerializerFeature.WriteNullBooleanAsFalse,
                SerializerFeature.WriteNonStringKeyAsString,
                SerializerFeature.BrowserCompatible);

        //解决Long转json精度丢失的问题
        SerializeConfig serializeConfig = SerializeConfig.globalInstance;
        serializeConfig.put(BigInteger.class, ToStringSerializer.instance);
        serializeConfig.put(Long.class, ToStringSerializer.instance);
        serializeConfig.put(Long.TYPE, ToStringSerializer.instance);
        fastJsonConfig.setSerializeConfig(serializeConfig);

        //处理中文乱码问题
        List fastMediaTypes = new ArrayList<>();
        fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);

        fastConverter.setSupportedMediaTypes(fastMediaTypes);
        fastConverter.setFastJsonConfig(fastJsonConfig);
        converters.add(fastConverter);
    }

}

参考：https://blog.csdn.net/Nightliar/article/details/82351963