Spring的refresh方法-InitializingBean番外篇(4

所有的内容都是基于 https://gitee.com/chris_777/spring-boot2.1.3 springboot 源码
main函数入口org.springframework.boot.tests.hibernate52.Hibernate52Application.main

InitializingBean根据名字就能判断出来是跟初始化有关系的，Spring会在获取Bean方法(org.springframework.beans.factory.support.AbstractBeanFactory#doGetBean)，对象初始化(org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory#initializeBean)阶段，调用Bean的init方法时候，会判断当前的Bean是否为InitializingBean类型，则执行相应的逻辑。

下面就是InitializingBean接口的具体代码，只有一个afterPropertiesSet方法。

public interface InitializingBean {

	/**
	 * Invoked by the containing {@code BeanFactory} after it has set all bean properties
	 * and satisfied {@link BeanFactoryAware}, {@code ApplicationContextAware} etc.
	 * <p>This method allows the bean instance to perform validation of its overall
	 * configuration and final initialization when all bean properties have been set.
	 * @throws Exception in the event of misconfiguration (such as failure to set an
	 * essential property) or if initialization fails for any other reason
	 */
	void afterPropertiesSet() throws Exception;

}

需要结合具体业务实现相应的场景，但是我目前想不到相应场景，那就输出一个hello word吧

@Component
public class MyInitializingBeanTest implements InitializingBean {

	@Override
	public void afterPropertiesSet() throws Exception {
		System.out.println("hello word InitializingBean");
	}

}
//启动输出  hello word InitializingBean