工厂类 new实例 实例对象注解失效问题处理

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为什么失效

如何解决

例子

/**
    * Feng Add 2019.10.20
    * 注册送券活动
    */
   @Service
    public class RegistGiveCouponImp implements Activity {
    
        private final Logger logger = LoggerFactory.getLogger(RegistGiveCouponImp.class);
    
    
        private static ZnyOilActivityMerchMapper znyOilActivityMerchMapper;
    
        @Resource
        private  ZnyOilActivityMerchMapper sZnyOilActivityMerchMapper;
    
        @PostConstruct
        public void RegistGiveCouponImp() {
            znyOilActivityMerchMapper = this.sZnyOilActivityMerchMapper;
        }
     }