如何通过模式获得按价值服务？
How to get service according value with pattern?
我想根据角色价值，获得关联服务，喜欢
LogisticsUserEntity user = this.getLogisticsUserById(userId);
UserDealService userDealService = getUserDealService(user.getRole());
UserEntity userEntity = userDealService.getUserEntity(user);
LogisticsUserDao 和 TruckOwnerDao 都实现了 UserDealService 接口。
如果role是4，driverDaoreturn，如果是5，truckOwnerDaoreturn，但是我用过
@Autowired
private DriverDao driverDao;
@Autowired
private TruckOwnerDao truckOwnerDao;
我不想用地图，喜欢
put(4, driverDao);
因为如果我要添加其他dao，我必须修改代码，这违反了open-closed。
那么如何解决扩展问题呢？
感谢您提前提供的所有帮助和建议。
评论里已经说了，需要工厂，但是工厂很少
Factory - Creates objects without exposing the instantiation logic to the client and Refers to the newly created object through a common interface. Is a simplified version of Factory Method
Factory Method - Defines an interface for creating objects, but let subclasses to decide which class to instantiate and Refers to the newly created object through a common interface.
Abstract Factory - Offers the interface for creating a family of related objects, without explicitly specifying their classes.
我会考虑工厂方法，这样您的“用户”对象就会有方法“user.createUserDealService()”，returns 需要服务。
但是我不确定这是否应该称为服务，服务是可远程调用的对象。
顺便说一句，根据用户获取 userEntity 看起来很奇怪。用户已经不是实体了吗？
我想根据角色价值，获得关联服务，喜欢
LogisticsUserEntity user = this.getLogisticsUserById(userId);
UserDealService userDealService = getUserDealService(user.getRole());
UserEntity userEntity = userDealService.getUserEntity(user);
LogisticsUserDao 和 TruckOwnerDao 都实现了 UserDealService 接口。 如果role是4，driverDaoreturn，如果是5，truckOwnerDaoreturn，但是我用过
@Autowired
private DriverDao driverDao;
@Autowired
private TruckOwnerDao truckOwnerDao;
我不想用地图，喜欢
put(4, driverDao);
因为如果我要添加其他dao，我必须修改代码，这违反了open-closed。
那么如何解决扩展问题呢？
感谢您提前提供的所有帮助和建议。
评论里已经说了，需要工厂，但是工厂很少
Factory - Creates objects without exposing the instantiation logic to the client and Refers to the newly created object through a common interface. Is a simplified version of Factory Method
Factory Method - Defines an interface for creating objects, but let subclasses to decide which class to instantiate and Refers to the newly created object through a common interface.
Abstract Factory - Offers the interface for creating a family of related objects, without explicitly specifying their classes.
我会考虑工厂方法，这样您的“用户”对象就会有方法“user.createUserDealService()”，returns 需要服务。
但是我不确定这是否应该称为服务，服务是可远程调用的对象。
顺便说一句，根据用户获取 userEntity 看起来很奇怪。用户已经不是实体了吗？