不完全spring学习-6Bean生命周期

四种方法

1. @Bean(initMethod="init-mathod-name",destroy="destroy-method-name")
2. @PostConstruct和@PreDestroy
3. 实现InitializingBean，DisposableBean
4. 实现BeanPostProcessor

@Bean(initMethod="init-mathod-name",destroy="destroy-method-name")

//bean
public class ABean{
    public void init() {
        //dosomthing
    }
   public void destroy() {
        //do destroy
   }
}
// config文件
@Configuration
public class Config {
    @Bean(initMethod="init",destroy=”destroy")
    public ABean aBean() {
        return new ABean();
   }
}

@PostConstruct和@PreDestroy

@Component
public class AComponent {
    @PostConstructor
    public void postConstructor () {
        // do something
   }
   @PreDestroy
   public void preDestroy() {
        //do some thing
   }
}

实现InitializingBean，DisposableBean

@Component
public class AComponent  implements InitializingBean,DisposableBean{
    @Override
    public void destroy() throws Exception {
        //do something
    }
   @Override
    public void afterPropertiesSet() throws Exception {
         //do something
    }
}

实现BeanPostProcessor

@Component
public class AComponent  DisposableBean{
    @Override
    public Object postProcessAfterInitialization(Object bean,String beanName) throws BeansException {
        //do something
    }
    @Override
    public Object postProcessBeforeInitialization(Object bean,String beanName) throws BeansException {
        //do something
    }
}

Spring底层对BeanPostProcessor的应用

可结合ApplicationAware接口和BeanPostProcessor，处理各类注解