一 指定初始化和销毁方法
通过@Bean指定init-method和destroy-method；
@Bean(initMethod="init",destroyMethod="detory")
public Car car(){
return new Car();
}
二 通过让Bean实现InitializingBean（定义初始化逻辑）
@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...");
}
}
三 可以使用JSR250
@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;
}
}
四 可以使用BeanPostProcessor
/**
* 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;
}
}