关于mapstruct的qualifiedByName和expression的使用（解决List类型映射成String的情况）

@Mapper
public interface CarMapper {

    CarMapper INSTANCE = Mappers.getMapper(CarMapper.class);

    /**
     * 映射
     * @param car
     * @return
     */
    @Mappings({
            @Mapping(target = "buyTime", source = "buyTime", dateFormat = "yyyy-MM-dd HH:mm:ss"),
            @Mapping(target = "constant", constant = "HAHA"),
            //使用expression的方式
//            @Mapping(target = "wheels",
//                    expression = "java(com.alibaba.fastjson.JSON." +
//                            "toJSONString(car.getWheels()))")
            //使用qualifiedByName的方式
            @Mapping(target = "wheels", qualifiedByName = "listToString")
    })
    CarEntity toCarEntity(Car car);

    @Named("listToString")
    default String listToString(List wheels){
        return JSON.toJSONString(wheels);
    }
}