Spring初始化和销毁的实现方法

 @Bean(initMethod="init",destroyMethod="detory")
   public Car car(){
     return new Car();
   }

@Component
public class Cat implements InitializingBean,DisposableBean {
  
  public Cat(){
    System.out.println("cat constructor...");
  }
​
  @Override
  public void destroy() throws Exception {
    // TODO Auto-generated method stub
    System.out.println("cat...destroy...");
  }
​
  @Override
  public void afterPropertiesSet() throws Exception {
    // TODO Auto-generated method stub
    System.out.println("cat...afterPropertiesSet...");
  }
​
}

@PostConstruct：在bean创建完成并且属性赋值完成；来执行初始化方法
@PreDestroy：在容器销毁bean之前通知我们进行清理工作
@Component
public class Dog implements ApplicationContextAware {
  //@Autowired
  private ApplicationContext applicationContext;
  
  public Dog(){
    System.out.println("dog constructor...");
  }
  
  //对象创建并赋值之后调用
  @PostConstruct
  public void init(){
    System.out.println("Dog....@PostConstruct...");
  }
  
  //容器移除对象之前
  @PreDestroy
  public void detory(){
    System.out.println("Dog....@PreDestroy...");
  }
​
  @Override
  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    // TODO Auto-generated method stub
    this.applicationContext = applicationContext;
  }
}

/**
 * 后置处理器：初始化前后进行处理工作
 * 将后置处理器加入到容器中
 * 在bean初始化前后进行一些处理工作；
 * postProcessBeforeInitialization:在初始化之前工作
 * postProcessAfterInitialization:在初始化之后工作
 */
@Component
public class MyBeanPostProcessor implements BeanPostProcessor,Ordered {
​
  @Override
  public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
    // TODO Auto-generated method stub
    System.out.println("postProcessBeforeInitialization..."+beanName+"=>"+bean);
    return bean;
  }
​
  @Override
  public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
    // TODO Auto-generated method stub
    System.out.println("postProcessAfterInitialization..."+beanName+"=>"+bean);
    return bean;
  }
​
  @Override
  public int getOrder() {
    return 2;
  }
}