BeanPostProcessor 与 ApplicationContextAware

在bean 实例化时，进行某种操作，可以继承`BeanPostProcessor`，缺点是每创建一个bean都会执行 postProcessBeforeInitialization()和postProcessAfterInitialization() 方法

@Service
public class Test1ServiceImpl implements BeanPostProcessor,Test1Service{

    @Override
    public void test1() {
        System.out.println("test1");
    }

    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName)
            throws BeansException {
        System.out.println("postProcessBeforeInitialization");
        return bean;
    }

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName)
            throws BeansException {
        System.out.println("postProcessAfterInitialization");
        return bean;
    }

}

推荐使用  ApplicationContextAware 

@Service
public class Test2ServiceImpl implements ApplicationContextAware,Test2Service{

    @Override
    public void test2() {
        System.out.println("test2");
    }

    @Override
    public void setApplicationContext(ApplicationContext arg0) throws BeansException {
        System.out.println("setApplicationContext");
    }

}