1、常用Aware接口及作用

Aware 接口用于注入一些与容器相关信息

BeanNameAware：注入 bean 的名字
BeanFactoryAware：注入 BeanFactory 容器
ApplicationContextAware：注入 ApplicationContext 容器
EmbeddedValueResolverAware：注入 ${} 解析器

示例

启动类：

public class A06 {
    public static void main(String[] args) {
        GenericApplicationContext context = new GenericApplicationContext();
        context.registerBean("myBean", MyBean.class);
        context.refresh(); // 1. beanFactory 后处理器,  2. 添加 bean 后处理器, 3. 初始化单例
        context.close();
    }
}

@Slf4j
public class MyBean implements BeanNameAware, ApplicationContextAware, BeanFactoryAware {

    @Override
    public void setBeanName(String name) {
        log.debug("当前bean " + this + " 名字叫:" + name);
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        log.debug("当前bean " + this + " ApplicationContext容器是:" + applicationContext);
    }

    @Override
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
        log.debug("当前bean " + this + " BeanFactory容器是:" + beanFactory);
    }
}

输出结果：

[DEBUG] 20:32:48.292 [main] com.xc.a06.MyBean                   - 当前bean com.xc.a06.MyBean@401e7803 名字叫:myBean 
[DEBUG] 20:32:48.310 [main] com.xc.a06.MyBean                   - 当前bean com.xc.a06.MyBean@401e7803 BeanFactory容器是:org.springframework.beans.factory.support.DefaultListableBeanFactory@548ad73b: defining beans [myBean]; root of factory hierarchy 
[DEBUG] 20:32:48.310 [main] com.xc.a06.MyBean                   - 当前bean com.xc.a06.MyBean@401e7803 ApplicationContext容器是:org.springframework.context.support.GenericApplicationContext@12843fce, started on Fri Aug 05 20:32:48 CST 2022 

Process finished with exit code 0