BeanPostProcessor 增强处理器
实现 BeanPostProcessor 接口，Spring 中所有 bean 在做初始化时都会调用该接口中的两个方法，可以用于对一些特殊的 bean 进行处理：
@Component public class SpringLifeCycleProcessor implements BeanPostProcessor { private final static Logger LOGGER = LoggerFactory.getLogger(SpringLifeCycleProcessor.class); /** * 预初始化 初始化之前调用 * @param bean * @param beanName * @return * @throws BeansException */ @Override public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException { if ("annotationBean".equals(beanName)){ LOGGER.info("SpringLifeCycleProcessor start beanName={}",beanName); } return bean; } /** * 后初始化 bean 初始化完成调用 * @param bean * @param beanName * @return * @throws BeansException */ @Override public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException { if ("annotationBean".equals(beanName)){ LOGGER.info("SpringLifeCycleProcessor end beanName={}",beanName); } return bean; } }
执行之后观察结果：
018-03-21 00:40:24.856 [restartedMain] INFO c.c.s.p.SpringLifeCycleProcessor - SpringLifeCycleProcessor start beanName=annotationBean 2018-03-21 00:40:24.860 [restartedMain] INFO c.c.spring.annotation.AnnotationBean - AnnotationBean start 2018-03-21 00:40:24.861 [restartedMain] INFO c.c.s.p.SpringLifeCycleProcessor - SpringLifeCycleProcessor end beanName=annotationBean 2018-03-21 00:40:24.864 [restartedMain] INFO c.c.s.aware.SpringLifeCycleAware - SpringLifeCycleAware start 2018-03-21 00:40:24.867 [restartedMain] INFO c.c.s.service.SpringLifeCycleService - SpringLifeCycleService start 2018-03-21 00:40:24.887 [restartedMain] INFO c.c.spring.SpringLifeCycle - SpringLifeCycle start 2018-03-21 00:40:25.062 [restartedMain] INFO o.s.b.d.a.OptionalLiveReloadServer - LiveReload server is running on port 35729 2018-03-21 00:40:25.122 [restartedMain] INFO o.s.j.e.a.AnnotationMBeanExporter - Registering beans for JMX exposure on startup 2018-03-21 00:40:25.140 [restartedMain] INFO com.crossoverjie.Application - Started Application in 2.309 seconds (JVM running for 3.681) 2018-03-21 00:40:25.143 [restartedMain] INFO com.crossoverjie.Application - start ok! 2018-03-21 00:40:25.153 [Thread-8] INFO o.s.c.a.AnnotationConfigApplicationContext - Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@3913adad: startup date [Wed Mar 21 00:40:23 CST 2018]; root of context hierarchy 2018-03-21 00:40:25.155 [Thread-8] INFO o.s.j.e.a.AnnotationMBeanExporter - Unregistering JMX-exposed beans on shutdown 2018-03-21 00:40:25.156 [Thread-8] INFO c.c.spring.SpringLifeCycle - SpringLifeCycle destroy 2018-03-21 00:40:25.156 [Thread-8] INFO c.c.s.service.SpringLifeCycleService - SpringLifeCycleService destroy 2018-03-21 00:40:25.156 [Thread-8] INFO c.c.spring.annotation.AnnotationBean - AnnotationBean destroy
直到 Spring 上下文销毁时则会调用自定义的销毁方法以及实现了 DisposableBean 的 destroy() 方法。
