总结Bean的三种自定义初始化和销毁方法

public class CarA {
    public CarA() {
        System.out.println("CarA。。。构造函数");
    }
    public void initCarA(){
        System.out.println("CarA的init()方法");
    }
    public void destroyCarA(){
        System.out.println("CarA的destroy()方法");
    }
}
@Configuration
public class ConfigTest {
    @Bean(initMethod = "initCarA",destroyMethod = "destroyCarA")
    public CarA carA(){
        return new CarA();
    }
}

public class CarB implements InitializingBean, DisposableBean {
    public CarB() {
        System.out.println("CarB。。。构造函数");
    }
    @Override
    public void afterPropertiesSet() throws Exception {
        System.out.println("CarB。。。afterPropertiesSet()方法执行");
    }
    @Override
    public void destroy() throws Exception {
        System.out.println("CarB。。。destroy()方法执行");
    }
}
@Configuration
public class ConfigTest {
    @Bean
    public CarB carB(){
        return new CarB();
    }
}

public interface InitializingBean {
    void afterPropertiesSet() throws Exception;
}

package org.springframework.beans.factory;
public interface DisposableBean {
    void destroy() throws Exception;
}

public class CarC {
    public CarC() {
        System.out.println("CarC。。。构造函数");
    }
    @PostConstruct
    public void initCarC(){
        System.out.println("CarC。。。初始化方法initCarC()");
    }
    @PreDestroy
    public void destroyCarC(){
        System.out.println("CarC。。。销毁方法destroyCarC");
    }
}
@Configuration
public class ConfigTest {
    @Bean
    public CarC carC(){
        return new CarC();
    }
}

@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Service
public @interface ServiceCode {
    String code() default ""; 
    String className() default "";
}

@ServiceCode(code = "100010", className = "echoService")
@Service("echoService")
public class EchoService { 
}

@Component
@Order(1)
public class ServiceInitListener implements ApplicationListener<ContextRefreshedEvent> {
    private static final Logger LOGGER = LoggerFactory.getLogger(ServiceInitListener.class); 
    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
        ApplicationContext applicationContext = event.getApplicationContext();
        //注意 需要时根容器才能通过注解获取到bean，比如event直接获取的容器中只有一些公共注册bean
        if (applicationContext.getParent() != null) {
            applicationContext = applicationContext.getParent();
        }
        Map<String, Object> beansWithAnnotation = applicationContext.getBeansWithAnnotation(ServiceCode.class);
        for (Object bean : beansWithAnnotation.values()) {
            ServiceCode annotation = bean.getClass().getAnnotation(ServiceCode.class);
            String code = annotation.code();
            String className = annotation.className();
            //注册接口编号和beanName
            //在统一入口可通过code获取beanName，然后通过springContext获取对应bean执行自定义逻辑
            //或者完成其他逻辑
        }
    } 
}