spring中bean是线程安全的吗 Spring中Bean初始化和销毁方法执行的优先级

Spring有三对初始化和销毁方法

通过@Bean注解指定initMethod和destroyMethod
实现InitializingBean和DisposableBean接口
使用@PostContruct和@PreDestroy

那么问题来了，这三个执行的优先级是什么呢？
定义一个Car类

public class Car implements InitializingBean, DisposableBean {public Car() {System.out.println("car constructor");}@PostConstructpublic void postConstruct(){System.out.println("postConstruct");}@Overridepublic void afterPropertiesSet() throws Exception {System.out.println("InitializingBean afterPropertiesSet");}public void initMethod(){System.out.println("initMethod");}@PreDestroypublic void preDestroy(){System.out.println("preDestroy");}@Overridepublic void destroy(){System.out.println("DisposableBean destroy");}public void destroyMethod(){System.out.println("destroyMethod");}}

定义配置类，并注入

@Configurationpublic class MyConfigOfLifeCycle {@Bean(initMethod = "initMethod",destroyMethod = "destroyMethod")public Car car(){return new Car();}}

测试

@Testpublic void test04(){AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(MyConfigOfLifeCycle.class);System.out.println("容器创建完成");Object car = context.getBean("car");context.close();}

执行结果【spring中bean是线程安全的吗 Spring中Bean初始化和销毁方法执行的优先级】

car constructorpostConstructInitializingBean afterPropertiesSetinitMethod容器创建完成preDestroyDisposableBean destroydestroyMethod

结论优先级：@PostConstruct > InitializingBean > 通过@Bean指定