Springboot解决雪花算法ID到前端精度丢失

JS的数字类型目前支持的最大值为：9007199254740992(16位)，一旦数字超过这个值，JS将会丢失精度，导致前后端的值出现不一致。

JAVA的Long类型的 最大值为：9223372036854775807（19位），snowflake的算法在实现上确实没问题的，但实际运用的时候一定要避免这个潜在的深坑。

Jackson 全局方式1 spring默认的json处理方式（推荐使用）

@Configuration
public class JacksonConfig implements WebMvcConfigurer {

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {

        MappingJackson2HttpMessageConverter jackson2HttpMessageConverter =
                new MappingJackson2HttpMessageConverter();
        ObjectMapper objectMapper = new ObjectMapper();
        SimpleModule simpleModule = new SimpleModule();
        simpleModule.addSerializer(BigInteger.class, ToStringSerializer.instance);
        simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
        simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
        objectMapper.registerModule(simpleModule);
        jackson2HttpMessageConverter.setObjectMapper(objectMapper);
        converters.add(jackson2HttpMessageConverter);
        converters.add(new StringHttpMessageConverter(Charset.forName("UTF-8")));

    }
}

Jackson 全局方式2 spring默认的json处理方式（推荐使用）

public class JacksonMapper extends ObjectMapper {

    public JacksonMapper() {
        super();
        this.configure(JsonGenerator.Feature.WRITE_BIGDECIMAL_AS_PLAIN, true);
        this.configure(JsonGenerator.Feature.IGNORE_UNKNOWN, true);
        this.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        this.setSerializationInclusion(JsonInclude.Include.NON_NULL);

        SimpleModule simpleModule = new SimpleModule();
        simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
        simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
        simpleModule.addSerializer(long.class, ToStringSerializer.instance);
        registerModule(simpleModule);

    }
}

    @Bean
    public MappingJackson2HttpMessageConverter getMappingJackson2HttpMessageConverter() {
        return new MappingJackson2HttpMessageConverter(new JacksonMapper());
    }

Fastjson 全局方式阿里的json工具

@Configuration
public class JacksonConfig implements WebMvcConfigurer {

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        FastJsonHttpMessageConverter fastConverter =
                new FastJsonHttpMessageConverter();

        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        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);
        fastConverter.setFastJsonConfig(fastJsonConfig);
        converters.add(fastConverter);
    }


}

Jackson注解方式 选一个

@JsonSerialize(using=ToStringSerializer.class)
@JsonFormat

Fastjson注解方式

@JSONField(serializeUsing = ToStringSerializer.class)