Spring – 泛型依赖注入(9)

• 2020 年 3 月 17 日
• 筆記

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 { }