[ Spring ] Bean LifeCycle

iteye_4103

于 2012-12-27 21:50:04 发布

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分类专栏： Spring 文章标签： java

本文链接：https://blog.youkuaiyun.com/iteye_4103/article/details/82451774

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本文深入探讨了Spring框架中Bean的生命周期控制机制，包括@PostConstruct和@PreDestory注解、InitializingBean接口和DisposableBean接口，以及标准命名方法init()和destory()的应用。同时，介绍了如何在应用上下文中配置这些机制，并强调了使用CommonAnnotationBeanPostProcessor的必要性。

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Bean Life Cycle (Initialization & Destory)

We have 3 ways to control th life-cycle of Bean.

1) @PostConstruct and @PreDestory

2) afterPropertiesSet() from interface InitializingBean

destory() from interface DisposableBean

3) Standard method naming, init() & destory()

Above are 3 mechanisms, if applying the mechanisms to one bean with different method names,the sequence would be :

INFO [com.vincent.spring.main.LifeCycleBean] - LifeCycleBean Constructor
INFO [com.vincent.spring.main.LifeCycleBean] - postConstruct
INFO [com.vincent.spring.main.LifeCycleBean] - AfterPropertiesSet
INFO [com.vincent.spring.main.LifeCycleBean] - init

if with same names, will only be excuted once.

In applicationcontext.xml, should add below:

<bean class="org.springframework.context.annotation.CommonAnnotationBeanPostProcessor" />

For @PostConstruct & @PreDestory,we need to add the dependency of "javax.annotation" to pom.xml.

<dependency>
	<groupId>javax.annotation</groupId>
	<artifactId>jsr250-api</artifactId>
	<version>1.0</version>
</dependency>