JAVA返回给小程序的Long类型值变了

这是因为java的长整型存储的范围比js大造成的精度丢失，所以返回的时候要返回string就可以了

做如下配置

@Configuration
public class LongToStringJsonConfig extends WebMvcConfigurationSupport {
   
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        MappingJackson2HttpMessageConverter jackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter();
        ObjectMapper objectMapper = new ObjectMapper();
        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);
    }
}

全局时间戳转日期

@Configuration
public class LongToDateConfig extends WebMvcConfigurationSupport {
    /*处理返回的long类型前端无法显示问题*/
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        MappingJackson2HttpMessageConverter jackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter();
        ObjectMapper objectMapper = new ObjectMapper();
        /**
         * 日期全局格式化
         * */
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
        objectMapper.setTimeZone(TimeZone.getTimeZone("GMT+8"));//GMT+8
        jackson2HttpMessageConverter.setObjectMapper(objectMapper);
        converters.add(jackson2HttpMessageConverter);

    }
}

config配置文件只能写一个，不然冲突会有一个失效