1.InitializingBean與DisposableBean

InitializingBean

定義初始化邏輯，用于執行自定義初始化或者校驗已設置的屬性值等。

* 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，用于一個實例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閉時，才會調用該方法。

ApplicationContext關閉時，默認對所有單例bean都會調用這個方法。

* 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.實例

//實現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 ..... 初始化結束");System.out.println("applicationContext ..... 準備關閉");applicationContext.close();System.out.println("applicationContext ..... 已關閉");} }測試結果： BeanLife--->construct... BeanLife--->InitializingBean.afterPropertiesSet applicationContext ..... 初始化結束applicationContext ..... 準備關閉 BeanLife--->DisposableBean.destroy applicationContext ..... 已關閉

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總結

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