java 在另一个服务中注入服务
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Inject service in another service
提问by Ward
I have UserService and MissionService.
我有 UserService 和 MissionService。
Is it ok to inject MissionService in UserSerivce or vice versa?
在 UserSerivce 中注入 MissionService 是否可以，反之亦然？
If yes, what about unit testing?
如果是，那么单元测试呢？
采纳答案by Fabian Damken
Of course you can and it is perfectly fine. But I recommend that you use method-injection in order to allow you to set the instance at runtime without using using reflection (you can create an instance manually).
当然可以，而且完全没问题。但是我建议您使用方法注入，以便允许您在运行时设置实例而不使用反射（您可以手动创建一个实例）。
For example:
例如：
@Service
public class MissionService { }
@Service
public class UserService {
private MissionService missionService;
@Autowired
public void setMissionService(MissionService missionService) {
this.missionService = missionService;
}
}
This allows you to create both services using regular Java without Spring:
这允许您在没有 Spring 的情况下使用常规 Java 创建这两种服务：
MissionService missionService = new MissioNService();
UserService userService = new UserService();
userService.setMissionService(missionService);
Caution: You have to take care of not building dependency cycles.It is not set that Spring resolves them, I think
注意：您必须注意不要构建依赖循环。我认为 Spring 并没有解决它们
