Spring IOC容器
九、泛型依赖注入
1.简介
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。
2.实现
[1]组件基类
|
BaseRepository |
|
public class BaseRepository<T> { public void save() { System.out.println("Saved by BaseRepository"); }
} |
|
BaseService |
|
public class BaseService<T> { @Autowired private BaseRepository<T> repository; public void add() { repository.save(); }
} |
[2]组件实体类
|
UserRepository |
|
@Repository public class UserRepository extends BaseRepository<User>{ public void save() { System.out.println("Saved by UserRepository"); }
} |
|
UserService |
|
@Service public class UserService extends BaseService<User>{
} |
[3]模型实体类
|
User |
|
public class User {
} |
[4]测试
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ApplicationContext ioc = new ClassPathXmlApplicationContext("di.xml");
UserService us = (UserService) ioc.getBean("userService");
us.add(); |
|
执行结果 |
|
Saved by UserRepository |
