02生命周期回调

生命周期回调

InitializingBean && DisposableBean

public class AnotherExampleBean implements InitializingBean {

    @Override
    public void afterPropertiesSet() {
        // do some initialization work
    }
}
public class AnotherExampleBean implements DisposableBean {

    @Override
    public void destroy() {
        // do some destruction work (like releasing pooled connections)
    }
}

@PostConstruct && @PreDestroy

public class CachingMovieLister {

    @PostConstruct
    public void populateMovieCache() {
        // populates the movie cache upon initialization...
    }

    @PreDestroy
    public void clearMovieCache() {
        // clears the movie cache upon destruction...
    }
}

init-method && destroy-method with XML

<bean id="exampleInitBean" class="examples.ExampleBean" destroy-method="cleanup" init-method="init"/>

public class ExampleBean {

    public void cleanup() {
        // do some destruction work (like releasing pooled connections)
    }
     public void init() {
        // do some initialization work
    }
}

initMethod && destroyMethod of @Bean

public class BeanOne {

    public void init() {
        // initialization logic
    }
}

public class BeanTwo {

    public void cleanup() {
        // destruction logic
    }
}

@Configuration
public class AppConfig {

    @Bean(initMethod = "init")
    public BeanOne beanOne() {
        return new BeanOne();
    }

    @Bean(destroyMethod = "cleanup")
    public BeanTwo beanTwo() {
        return new BeanTwo();
    }
}

default-init-method

<beans default-init-method="init">

    <bean id="blogService" class="com.something.DefaultBlogService">
        <property name="blogDao" ref="blogDao" />
    </bean>

</beans>