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spring之Hooking to bean life cycles
Often, in enterprise application development, developers will want to plug in some extra functionality to be executed just after the construction
and before the destruction of a business service. Spring provides multiple methods for interacting with such stages in the life cycle of a bean.
Implementing InitializingBean and DisposableBean
The Spring IoC container invokes the callback methods afterPropertiesSet() of
org.springframework.beans.factory.InitializingBean and destroy() of org.springframework.beans.factory.DisposableBean on any Spring bean and implements them:
public class UserServiceImpl implements UserService, InitializingBean,
DisposableBean {
...
@Override
public void afterPropertiesSet() throws Exception
{
logger.debug( this + ".afterPropertiesSet() invoked!" );
/* Your initialization code goes here.. */
}
@
Override
public void destroy() throws Exception
{
logger.debug( this + ".destroy() invoked!" );
/* Your cleanup code goes here.. */
}
...
}
Annotating @PostConstruct and @PreDestroy on @Components
Spring supports JSR 250 @PostConstruct and @PreDestroy annotations on any Spring bean in an annotation supported environment, as shown
here. Spring encourages this approach over implementing Spring-specific interfaces, as given in the previous section:
@Service
public class AnnotatedTaskService implements TaskService {
...
@PostConstruct
public void init()
{
logger.debug( this.getClass().getName() + " started!" );
}
@
PreDestroy
public void cleanup()
{
logger.debug( this.getClass().getName() + " is about to destroy!" );
}
...
}
The init-method and destroy-method attributes of <bean/>
If you are using XML-only bean configuration metadata, then your best option is to declare init-method and destroy-method attributes on your <bean/>
tags:
<bean id = "xmlTaskService" class = "com…XmlDefinedTaskService"
initmethod = "init"
destroy - method = "cleanup" >
...
< / bean>
Container-level default-init-method and default-destroy-method
You can even set container-level default init and destroy methods
so that you don’t need to set it for each bean. The container invokes these methods on beans only if they are present:
<beans default - init - method = "init" default - destroy - method = "cleanup" >
...
< / beans>
读书笔记：
Spring Essentials
Copyright ? 2016 Packt Publishing
First published: February 2016
Production reference: 1230216
Published by Packt Publishing Ltd.
Livery Place
35 Livery Street
Birmingham B3 2PB, UK.
ISBN 978-1-78398-234-9
www.packtpub.com
spring之Hooking to bean life cycles
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原文地址：http://blog.csdn.net/doctor_who2004/article/details/51232664
