利用@Autowire注入List/Map

Autowired注解

以往我认知里@Autowire可以注入单个Bean, 但实际上它可将所有继承了相同接口的Bean注入为List. 此外它还可以自动导入{beanName, interface}形式的Map. 话不多说, 直接上代码:

使用后自动导入依赖, 它可注解在接口对应的List上或者value为对象的Map上 ,直接上代码:

public interface BeanInterface {
    public void say();
}

@Component
@Order(1)
public class BeanImplOne implements BeanInterface {
    @Override
    public void say() {
        System.out.println("aaa");
    }
}

@Component
@Order(2)
public class BeanImplTwo implements BeanInterface {
    @Override
    public void say() {
        System.out.println("bbb");
    }
}

编写测试类:

@Component
public class BeanInvoke {
    @Autowired
    List<BeanInterface> list;

    @Autowired
    Map<String, BeanInterface> map;

    @Bean
    public void test() {
        for (BeanInterface beanInterface : list) {
            beanInterface.say();
        }

  
        for (String s : map.keySet()) {
            System.out.println(s + "-->" + map.get(s));
        }
    }
}
------------------------------------
aaa
bbb
beanImplOne-->com.wang.multiBean.BeanImplOne@74ecacc3
beanImplTwo-->com.wang.multiBean.BeanImplTwo@517a2b0

• Order: 继承了相同接口的实现类对应的Bean被注入的顺序
• Map的String为Bean的名字

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