Java技能积累-bean属性初始化后执行某个方法

一、InitializingBean

InitializingBean 是 Spring 提供的拓展性接口，它为 bean 提供了属性初始化后的处理方法。该接口只有一个名为 afterPropertiesSet 的方法，凡是继承该接口的类，在 bean 的属性初始化后都会执行该方法。在 Spring 初始化 bean 时，如果 bean 实现了 InitializingBean 接口，会自动调用 afterPropertiesSet 方法。

/** * Interface to be implemented by beans that need to react once all their properties * have been set by a {@link BeanFactory}: e.g. to perform custom initialization, * or merely to check that all mandatory properties have been set. * * <p>An alternative to implementing {@code InitializingBean} is specifying a custom * init method, for example in an XML bean definition. For a list of all bean * lifecycle methods, see the {@link BeanFactory BeanFactory javadocs}. * * @author Rod Johnson * @author Juergen Hoeller * @see DisposableBean * @see org.springframework.beans.factory.config.BeanDefinition#getPropertyValues() * @see org.springframework.beans.factory.support.AbstractBeanDefinition#getInitMethodName() */publicinterfaceInitializingBean{/** * 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 */voidafterPropertiesSet()throwsException;}