Bean生命周期
package xyz.pascall.spring.learn.component; import lombok.ToString; 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.beans.factory.config.BeanPostProcessor; import org.springframework.core.Ordered; import org.springframework.stereotype.Component; import javax.annotation.PostConstruct; import javax.annotation.PreDestroy; /** * SpringBeanPostProcessorLive * <p> * 一：实例化 * BeanFactory: 第一次请求时，初始化bean通过调用createBean实例化 * ApplicationContext: 容器启动结束后，通过BeanDefinition实例化所用bean * 二：设置对象属性（依赖注入） * （bean被封装到BeanWrapper中）Spring根据BeanDefinition和BeanWrapper提供的属性设置接口完成依赖注入 * 三：处理Aware接口 * 1.ApplicationContextAware(*) * 2.ApplicationEventPublisherAware * 3.BeanClassLoaderAware(*) * 4.BeanFactoryAware * 5.BeanNameAware * 6.EmbeddedValueResolverAware * 7.EnvironmentAware(*) * 8.ImportAware * 9.LoadTimeWeaverAware * 10.MessageSourceAware * 11.NotificationPublisherAware * 12.ResourceLoaderAware * 13.ServletConfigAware * 14.ServletContextAware * 四：init-method（@init-method） * 五：InitializingBean（bean属性设置之后接口） * 六：BeanPostProcessor.postProcessBeforeInitialization(Object, String) * 七：BeanPostProcessor.postProcessAfterInitialization(Object, String) * ===================================================================== * 八：DisposableBean * 九：destroy-method * * * ===================================================================== * ===================================================================== * 1.工厂后置处理器(容器级) * BeanFactoryPostProcessor * AspectJWeavingEnabler * ConfigurationClassPostProcessor * CustomAutowireConfigurer * 2.容器级别生命周期处理器(实现类“后处理器”) * InstantiationAwareBeanPostProcessor * BeanPostProcessor * 3.Bean级生命周期接口方法 * BeanNameAware * BeanFactoryAware * InitializingBean * DiposableBean * 4.Bean自身的方法 * init-method * destroy-method * * ********************************************************************* * ********************************************************************* * BeanFactoryPostProcessor加载顺序： * 1.PriorityOrdered * 2.Ordered * 3.无排序 * * Spring解析处理所有@Configuration标签类，并将Bean定义注册到BeanFactory中 * 1.internalConfigurationAnnotationProcessor -> ConfigurationClassPostProcessor -> PriorityOrdered * * Spring通过EventListenerMethodProcessor来处理@EventListener注解 * ** 自定义listener使用@EventListener注解在监听的方法上 * ** Spring通过EventListenerMethodProcessor解析配置类包含@EventListener的方法 * ** 通过DefaultEventListenerFactory将其转化为ApplicationListenerMethodAdapter#ApplicationListenerMethodAdapter对象 * 1.internalEventListenerProcessor -> EventListenerMethodProcessor * ********************************************************************* * ********************************************************************* * BeanPostProcessor加载顺序： * 1、找到所有实现PriorityOrdered的BeanPostProcessor，然后getBean，然后统一排序，然后beanFactory.addBeanPostProcessor(..) * 2、找到所有实现Ordered的BeanPostProcessor，然后getBean，然后统一排序，然后beanFactory.addBeanPostProcessor(..) * 3、找到所有没实现排序接口的BeanPostProcessor，不需要sort，直接beanFactory.addBeanPostProcessor(..) * 4、最后注册一个特殊的处理器，beanFactory.addBeanPostProcessor(new ApplicationListenerDetector(applicationContext)); * * Spring定义的没有排序的BeanPostProcessor * 1.ApplicationContextAwareProcessor(*) -> 比较特殊，处理感知接口Aware的BeanPostProcessor，被提前实例化 * 2.ApplicationListenerDetector -> 检查作用在Bean上的BeanPostProcessor的数量是否足够，否则PostProcessorRegistrationDelegate$BeanPostProcessorChecker * 3.ServletContextAwareProcessor * 4.ConfigurationClassPostProcessor$ImportAwareBeanPostProcessor * * Spring中与注解@Autowired/@Resource有关的BeanPostProcessor最先被加载 * 1.internalAutowiredAnnotationProcessor -> AutowiredAnnotationBeanPostProcessor -> PriorityOrdered * 2.internalCommonAnnotationProcessor -> CommonAnnotationBeanPostProcessor -> PriorityOrdered * ********************************************************************* * ********************************************************************* * InstantiationAwareBeanPostProcessor * ********************************************************************* * ********************************************************************* * * @author Jie Zhang, 2019/7/30 * @version DEMO v1.0 */ @Component @Slf4j @ToString public class SpringBeanPostProcessorLive implements BeanNameAware, BeanPostProcessor, InitializingBean, DisposableBean, Ordered { private ComponentDemo componentDemo; /** * 1.初始化 */public SpringBeanPostProcessorLive() { log.info("1.SpringBeanPostProcessorLive.SpringBeanPostProcessorLive()"); } /** * 3.处理Aware接口（BeanNameAware） * * @param name */ @Override public void setBeanName(String name) { log.info("3.BeanNameAware.setBeanName(String name)"); } /** * 4.init-method */ @PostConstruct public void init() { log.info("4.init-method"); } /** * 5.InitializingBean * * @throws Exception */ @Override public void afterPropertiesSet() throws Exception { log.info("5.InitializingBean.afterPropertiesSet()"); } /** * 6.处理bean后置处理器前置方法 * * @param bean * @param beanName * @return * @throws BeansException */ @Override public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException { log.info("6.BeanPostProcessor.postProcessBeforeInitialization(Object bean, String beanName)"); log.info(beanName); if (bean instanceof ComponentDemo) { this.componentDemo = (ComponentDemo)bean; } return bean; } /** * 7.处理bean后置处理器后置方法 * * @param bean * @param beanName * @return * @throws BeansException */ @Override public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException { log.info("7.BeanPostProcessor.postProcessAfterInitialization(Object bean, String beanName)"); log.info(beanName); return bean; } ///////////////////////////////////////////////////////////////////////////////////////////////// /** * 8.DisposableBean * @throws Exception */ @Override public void destroy() throws Exception { log.info("8.DisposableBean.destroy()"); } /** * 9.destroy-method */ @PreDestroy public void destroyMethod() { log.info("9.destroy-method"); } @Override public int getOrder() { return Integer.MAX_VALUE; } }
参考文章：
【小家Spring】Spring IOC容器启动流程 AbstractApplicationContext#refresh()方法源码分析（一）
