Spring Bean的生命周期学习

1、Spring Bean的整个生命周期图：

 

2、@PostConstructor和@PreDestroy注解：

@PostConstruct
public void afterConstructor() {
    System.out.println("after constructor..............");
}

@PreDestroy
public void beforeDestroy() {
    System.out.println("before destroy..............");
}

3、InitializingBean, DisposableBean 接口：

public class SpringLifeCycleService implements InitializingBean,DisposableBean{
    
    @Override
    public void afterPropertiesSet() throws Exception {
        System.out.println("SpringLifeCycleService start");
    }

    @Override
    public void destroy() throws Exception {
        System.out.println("SpringLifeCycleService destroy");
    }
}

4、指定init-method方法：

public class SpringLifeCycleService implements InitializingBean,DisposableBean{
    
    @Override
    public void start() {
        System.out.println("starting..........");
    }

    @Override
    public void stop() {
        System.out.println("stopping...............");
    }
}

并且在SpringMVC配置文件中添加：

<bean class="*.*.SpringLifeCycleService" init-method="start" destroy-method="stop"></bean>

5、BeanPostProcessor 接口：

public class MyTestImpl implements BeanPostProcessor {

    @Override
    public Object postProcessBeforeInitialization(Object o, String s) throws BeansException {
        System.out.println("BeanPostProcessor before init");
        return o;
    }

    @Override
    public Object postProcessAfterInitialization(Object o, String s) throws BeansException {
        System.out.println("BeanPostProcessor after init");
        return o;
    }
}