javaList集合的两种赋值方式

//将merchantDTO赋值给entity(相同的属性)
BeanUtils.copyProperties(merchantDTO,entity);

<!--       MapStruct代码生成器，对象转换 -->
        <dependency>
            <groupId>org.mapstruct</groupId>
            <artifactId>mapstruct-jdk8</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mapstruct</groupId>
            <artifactId>mapstruct-processor</artifactId>
            <version>${org.mapstruct.version}</version>
        </dependency>

@Mapper//这里的mapper是包org.mapstruct.Mapper
public interface AppCovert {
    AppCovert INSTANCE = Mappers.getMapper(AppCovert.class);
    /**
     * entity转dto
     */
    AppDTO entityTodto(App entity);

    /**
     * dto转entity
     * @param dto
     * @return
     */
    App dtoToEntity(AppDTO dto);
}

//将entity转换为dto
MerchantDTO merchantDTO = MerchantDetailConvert.INSTANCE.entityTodto(merchantInfo);

 /**
     * @param sources: 数据源类
     * @param target: 目标类
     * @return 赋值后的list
     */
    public static <S, T> List<T> copyListProperties(List<S> sources, Supplier<T> target, BeanCopyUtilCallBack<S, T> callBack) {
        List<T> list = new ArrayList<>(sources.size());
        for (S source : sources) {
            T t = target.get();
            BeanUtils.copyProperties(source, t);
            list.add(t);
        }
        return list;
    }

 List<Merchant> entity = new ArrayList<>();
        Merchant merchant = new Merchant();
        entity.add(merchant);
        List<MerchantDTO> ts = BeanCopyUtil.copyListProperties(entity, MerchantDTO::new);

@Mapper
public interface AppCovert {
AppCovert INSTANCE = Mappers.getMapper(AppCovert.class);
    /**
     * entityList转dtoList
     * @param app
     * @return
     */
    List<AppDTO> listEntityToDto(List<App> app);

}

List<App> apps = new ArrayList<>();
List<AppDTO> appDtos = AppCovert.INSTANCE.listEntityToDto(apps);