Spring源碼窺探之：xxxAware接口

Aware接口是一個標誌性接口，繼承此接口的接口xxxAware的實現類，在容器建立完成後，會回調實現方法，下面舉例：

1. 有不少xxxAware接口，下面舉兩個例子

/**
 * description: 將實現xxxAware接口的Bean註冊到IOC容器中的時候，會將xxxAware的實現方法進行回調操做
 *
 * @author 70KG
 * @date 2018/12/17
 */
@Component
public class MyAware implements ApplicationContextAware, BeanNameAware {

    private ApplicationContext applicationContext;

    private String beanName;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
        Cat cat = (Cat) applicationContext.getBean("cat");
        System.out.println("------->" + cat);
    }

    @Override
    public void setBeanName(String name) {
        this.beanName = name;
        System.out.println("------->" + beanName);
    }
}

2. 配置類

/**
 * description
 *
 * @author 70KG
 * @date 2018/12/17
 */
@Configuration
public class MyConfig {

    @Bean
    public Cat cat() {
        return new Cat();
    }

    @Bean
    public Dog dog() {
        return new Dog();
    }

    @Bean
    public MyAware myAware() {
        return new MyAware();
    }

}

3. 測試類

/**
 * description
 *
 * @author 70KG
 * @date 2018/12/17
 */
public class Test01 {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext app = new AnnotationConfigApplicationContext(MyConfig.class);
        Cat cat = (Cat) app.getBean("cat");
        System.out.println("------->" + cat);
    }
}

4. 結果

------->myAware
------->com.nmys.story.springCore.springioc.importBean.Cat@78b66d36
------->com.nmys.story.springCore.springioc.importBean.Cat@78b66d36