『配资门户一家天下』银行融资Spring中与bean有关的生命周期

记得以前的时候,每次提起Spring中的bean相关的生命周期时,内心都无比的恐惧,因为好像有很多,自己又理不清楚:什么beanFactory啊,aware接口啊,beanPostProcessor啊,afterPropertiesSet啊,initMethod啊等等。今天终于理清这些关系了,并且又新增了对postConstruct和lifecycle的理解。

前言

记得以前的时候,每次提起Spring中的bean相关的生命周期时,内心都无比的恐惧,因为好像有很多,自己又理不清楚:什么beanFactory啊,aware接口啊,beanPostProcessor啊,afterPropertiesSet啊,initMethod啊等等。

今天终于理清这些关系了,并且又新增了对postConstruct和lifecycle的理解。

执行顺序 - 首先是 BeanFactoryPostProcessor,它是针对所有bean的definition的,〔 杠杆鑫东财配资〕,只执行一次 下面是针对每个bean的初始 - 实现了一系列aware接口的,比如BeanNameAware,ApplicationContextAware,调用其set方法 - 执行BeanPostProcessor的postProcessBeforeInitialization方法 - 带有@PostConstruct注解的方法 - 实现InitializingBean接口的afterPropertiesSet方法 - 指定的initMethod方法 - 执行BeanPostProcessor的postProcessAfterInitialization方法 - 实现了SmartLifecycle接口的start方法(实现Lifecycle接口的不会自动调用,需要显式的调用start方法) 下面是针对每个bean的销毁 - 实现了SmartLifecycle接口的stop方法(实现Lifecycle接口的不会自动调用,需要显式的调用stop方法) - 带有@PreDestroy注解的方法 - 实现DisposableBean接口的destroy方法 - 指定的destroyMethod方法 目前就想到这么多了,其他的麻烦在评论区留言呀~ 代码实例 bean实体类 /** * @date: 2020-07-22 * * 一个简单的枚举类 */ public enum BeanType { NORMAL, LIFECYCLE, SMART_LIFECYCLE; } import javax.annotation.PostConstruct; import javax.annotation.PreDestroy; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.BeansException; import org.springframework.beans.factory.BeanNameAware; import org.springframework.beans.factory.DisposableBean; import org.springframework.beans.factory.InitializingBean; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; /** * @author: lihui * @date: 2020-07-22 * 一个简单的bean */ @Slf4j public class NormalBean implements BeanNameAware, ApplicationContextAware, InitializingBean, DisposableBean { private BeanType beanType; public NormalBean() { this(BeanType.NORMAL); } public NormalBean(BeanType beanType) { this.beanType = beanType; } @PostConstruct public void postConstruct() { log.info("{}, postConstruct", beanType); } @Override public void afterPropertiesSet() throws Exception { log.info("{}, afterPropertiesSet", beanType); } public void initMethod() { log.info("{}, initMethod", beanType); } @PreDestroy public void preDestroy() { log.info("{}, preDestroy", beanType); } @Override public void destroy() throws Exception { log.info("{}, destroy", beanType); } public void destroyMethod() { log.info("{}, destroyMethod", beanType); } @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { log.info("setApplicationContext, applicationContext : {}", applicationContext); } @Override public void setBeanName(String name) { log.info("setBeanName, bean name : {}", name); } } import lombok.extern.slf4j.Slf4j; import org.springframework.context.Lifecycle; /** * @author: lihui * @date: 2020-07-22 * 实现了Lifecycle的一个bean */ @Slf4j public class LifecycleBean extends NormalBean implements Lifecycle { private volatile boolean running = false; public LifecycleBean() { super(BeanType.LIFECYCLE); } @Override public void start() { log.info("start"); running = true; } @Override public void stop() { log.info("stop"); running = false; } @Override public boolean isRunning() { return running; } } import lombok.extern.slf4j.Slf4j; import org.springframework.context.SmartLifecycle; /** * @author: lihui * @date: 2020-07-22 * 实现了SmartLifecycle的一个bean */ @Slf4j public class SmartLifecycleBean extends NormalBean implements SmartLifecycle { private volatile boolean running = false; public SmartLifecycleBean() { super(BeanType.SMART_LIFECYCLE); } @Override public void start() { log.info("start"); running = true; } @Override public void stop() { log.info("stop"); running = false; } @Override public boolean isRunning() { return running; } } 配置类 import lombok.extern.slf4j.Slf4j; import org.springframework.beans.BeansException; import org.springframework.beans.factory.config.BeanFactoryPostProcessor; import org.springframework.beans.factory.config.ConfigurableListableBeanFactory; /** * @author: lihui * @date: 2020-07-25 */ @Slf4j public class MyBeanFactoryPostProcessor implements BeanFactoryPostProcessor { @Override public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException { log.info("postProcessBeanFactory, beanFactory:{}", beanFactory); } } import lombok.extern.slf4j.Slf4j; import org.springframework.beans.BeansException; import org.springframework.beans.factory.config.BeanPostProcessor; /** * @author: lihui * @date: 2020-07-25 */ @Slf4j public class MyBeanPostProcessor implements BeanPostProcessor { @Override public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException { log.info("postProcessBeforeInitialization, bean:{}", beanName); return bean; } @Override public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException { log.info("postProcessAfterInitialization, bean:{}", beanName); return bean; } } import lombok.extern.slf4j.Slf4j; import org.springframework.context.SmartLifecycle; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; /** * @author: lihui * @date: 2020-07-22 */ @Configuration @Slf4j public class Config { @Bean(initMethod = "initMethod", destroyMethod = "destroyMethod") public NormalBean normalBean() { return new NormalBean(); } @Bean(initMethod = "initMethod", destroyMethod = "destroyMethod") public LifecycleBean lifecycleBean() { return new LifecycleBean(); } @Bean(initMethod = "initMethod", destroyMethod = "destroyMethod") public SmartLifecycle smartLifecycle() { return new SmartLifecycleBean(); } @Bean public static MyBeanFactoryPostProcessor myBeanFactoryPostProcessor() { return new MyBeanFactoryPostProcessor(); } @Bean public static MyBeanPostProcessor myBeanPostProcessor() { return new MyBeanPostProcessor(); } } Main类 import lombok.extern.slf4j.Slf4j; import org.springframework.context.ConfigurableApplicationContext; import org.springframework.context.annotation.AnnotationConfigApplicationContext; /** * @author: lihui * @date: 2020-07-22 */ @Slf4j public class Main { public static void main(String[] args) throws InterruptedException { ConfigurableApplicationContext ctx = new AnnotationConfigApplicationContext(Config.class); ctx.registerShutdownHook(); Thread.sleep(5000); log.info("line ----------------------------- line"); ctx.start(); ctx.stop(); log.info("line ----------------------------- line"); } } 结果说明

结果正如前面所说的执行顺序一致,主要注意的就是Lifecycle接口和SmartLifecycle接口,只有实现了SmartLifecycle接口的bean在初始化时才会被自动调用,而实现了Lifecycle接口的除非显式调用start和stop方法才会被调用。

502 2020-07-26 23:43:41.808 [main] INFO c.e.d.s.a.i.l.MyBeanFactoryPostProcessor - postProcessBeanFactory, beanFactory:org.springframework.beans.factory.support.DefaultListableBeanFactory@55ca8de8: defining beans [org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.context.event.internalEventListenerProcessor,org.springframework.context.event.internalEventListenerFactory,config,normalBean,lifecycleBean,smartLifecycle,myBeanFactoryPostProcessor,myBeanPostProcessor]; root of factory hierarchy 520 2020-07-26 23:43:41.826 [main] INFO c.e.d.s.a.i.l.MyBeanPostProcessor - postProcessBeforeInitialization, bean:config 520 2020-07-26 23:43:41.826 [main] INFO c.e.d.s.a.i.l.MyBeanPostProcessor - postProcessAfterInitialization, bean:config 536 2020-07-26 23:43:41.842 [main] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - setBeanName, bean name : normalBean 536 2020-07-26 23:43:41.842 [main] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - setApplicationContext, applicationContext : org.springframework.context.annotation.AnnotationConfigApplicationContext@7cd62f43, started on Sun Jul 26 23:43:41 CST 2020 536 2020-07-26 23:43:41.842 [main] INFO c.e.d.s.a.i.l.MyBeanPostProcessor - postProcessBeforeInitialization, bean:normalBean 536 2020-07-26 23:43:41.842 [main] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - NORMAL, postConstruct 536 2020-07-26 23:43:41.842 [main] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - NORMAL, afterPropertiesSet 536 2020-07-26 23:43:41.842 [main] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - NORMAL, initMethod 537 2020-07-26 23:43:41.843 [main] INFO c.e.d.s.a.i.l.MyBeanPostProcessor - postProcessAfterInitialization, bean:normalBean 538 2020-07-26 23:43:41.844 [main] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - setBeanName, bean name : lifecycleBean 538 2020-07-26 23:43:41.844 [main] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - setApplicationContext, applicationContext : org.springframework.context.annotation.AnnotationConfigApplicationContext@7cd62f43, started on Sun Jul 26 23:43:41 CST 2020 538 2020-07-26 23:43:41.844 [main] INFO c.e.d.s.a.i.l.MyBeanPostProcessor - postProcessBeforeInitialization, bean:lifecycleBean 538 2020-07-26 23:43:41.844 [main] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - LIFECYCLE, postConstruct 540 2020-07-26 23:43:41.846 [main] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - LIFECYCLE, afterPropertiesSet 540 2020-07-26 23:43:41.846 [main] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - LIFECYCLE, initMethod 540 2020-07-26 23:43:41.846 [main] INFO c.e.d.s.a.i.l.MyBeanPostProcessor - postProcessAfterInitialization, bean:lifecycleBean 541 2020-07-26 23:43:41.847 [main] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - setBeanName, bean name : smartLifecycle 541 2020-07-26 23:43:41.847 [main] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - setApplicationContext, applicationContext : org.springframework.context.annotation.AnnotationConfigApplicationContext@7cd62f43, started on Sun Jul 26 23:43:41 CST 2020 541 2020-07-26 23:43:41.847 [main] INFO c.e.d.s.a.i.l.MyBeanPostProcessor - postProcessBeforeInitialization, bean:smartLifecycle 541 2020-07-26 23:43:41.847 [main] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - SMART_LIFECYCLE, postConstruct 541 2020-07-26 23:43:41.847 [main] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - SMART_LIFECYCLE, afterPropertiesSet 541 2020-07-26 23:43:41.847 [main] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - SMART_LIFECYCLE, initMethod 541 2020-07-26 23:43:41.847 [main] INFO c.e.d.s.a.i.l.MyBeanPostProcessor - postProcessAfterInitialization, bean:smartLifecycle 550 2020-07-26 23:43:41.856 [main] INFO c.e.d.s.a.i.l.SmartLifecycleBean - start 5562 2020-07-26 23:43:46.868 [main] INFO c.e.d.s.a.ioc.lifecycle.Main - line ----------------------------- line 5563 2020-07-26 23:43:46.869 [main] INFO c.e.d.s.a.i.lifecycle.LifecycleBean - start 5566 2020-07-26 23:43:46.872 [main] INFO c.e.d.s.a.i.l.SmartLifecycleBean - stop 5566 2020-07-26 23:43:46.872 [main] INFO c.e.d.s.a.i.lifecycle.LifecycleBean - stop 5566 2020-07-26 23:43:46.872 [main] INFO c.e.d.s.a.ioc.lifecycle.Main - line ----------------------------- line 5576 2020-07-26 23:43:46.882 [SpringContextShutdownHook] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - SMART_LIFECYCLE, preDestroy 5576 2020-07-26 23:43:46.882 [SpringContextShutdownHook] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - SMART_LIFECYCLE, destroy 5576 2020-07-26 23:43:46.882 [SpringContextShutdownHook] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - SMART_LIFECYCLE, destroyMethod 5576 2020-07-26 23:43:46.882 [SpringContextShutdownHook] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - LIFECYCLE, preDestroy 5576 2020-07-26 23:43:46.882 [SpringContextShutdownHook] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - LIFECYCLE, destroy 5577 2020-07-26 23:43:46.883 [SpringContextShutdownHook] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - LIFECYCLE, destroyMethod 5577 2020-07-26 23:43:46.883 [SpringContextShutdownHook] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - NORMAL, preDestroy 5577 2020-07-26 23:43:46.883 [SpringContextShutdownHook] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - NORMAL, destroy 5577 2020-07-26 23:43:46.883 [SpringContextShutdownHook] INFO c.e.d.s.a.ioc.lifecycle.NormalBean - NORMAL, destroyMethod