1.InitializingBean與DisposableBean

InitializingBean

定義初始化邏輯，用于執(zhí)行自定義初始化或者校驗(yàn)已設(shè)置的屬性值等。

* 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.

DisposableBean

定義銷毀邏輯，用于一個(gè)實(shí)例bean銷毀后需要釋放資源等。 只有bean從容器中移除或者銷毀或容器關(guān)閉時(shí)，才會調(diào)用該方法。

ApplicationContext關(guān)閉時(shí)，默認(rèn)對所有單例bean都會調(diào)用這個(gè)方法。

* Interface to be implemented by beans that want to release resources on destruction. * A {@link BeanFactory} will invoke the destroy method on individual destruction of a * scoped bean. An {@link org.springframework.context.ApplicationContext} is supposed * to dispose all of its singletons on shutdown, driven by the application lifecycle.

2.實(shí)例

//實(shí)現(xiàn)InitializingBean,DisposableBean接口的bean public class BeanLife implements InitializingBean,DisposableBean{public BeanLife() {System.out.println("BeanLife--->construct...");}@Overridepublic void afterPropertiesSet() throws Exception {System.out.println("BeanLife--->InitializingBean.afterPropertiesSet");}@Overridepublic void destroy() throws Exception {System.out.println("BeanLife--->DisposableBean.destroy");} }//配置類 @Configuration public class BeanLifeCycleConfig {@Bean(value = "beanLife")public BeanLife life() {return new BeanLife();} }//測試 public class BeanLifeCycleTest {public static void main(String[] args) {AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(BeanLifeCycleConfig.class);System.out.println("applicationContext ..... 初始化結(jié)束");System.out.println("applicationContext ..... 準(zhǔn)備關(guān)閉");applicationContext.close();System.out.println("applicationContext ..... 已關(guān)閉");} }測試結(jié)果： BeanLife--->construct... BeanLife--->InitializingBean.afterPropertiesSet applicationContext ..... 初始化結(jié)束applicationContext ..... 準(zhǔn)備關(guān)閉 BeanLife--->DisposableBean.destroy applicationContext ..... 已關(guān)閉

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