JAVA返回给小程序的Long类型值变了

我就是我 2022-09-06 00:25 93阅读 0赞

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