Spring 泛型依赖注入

spring 4.x 中可以为子类注入子类对应的泛型类型的成员变量的引用

@Service
public class UserService extends BaseService<User> {}

public class Main {
    public static void main(String[] args) {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserService userService = (UserService) ctx.getBean("userService");
        System.out.println(userService);
        userService.add();
    }
}

public class BaseService<T> {
    @Autowired
    protected BaseRepository<T> repository;

    public void add(){
        System.out.println("add...");
        System.out.println(repository);
    }
}

public class BaseRepository<T> { }

@Repository
public class UserRepository extends BaseRepository<User> {
    @Override
    public String toString() {
        System.out.println("UserRepository");
        return super.toString();
    }
}

public class User { }