BeanDefinitionRegistryPostProces

常见的, 我们可以使用@Service @Component @Bean 等注解将对象注册到ioc 容器中, 其实我们还可以使用代码将对象放入ico 容器中. 如下

@Component
public class CustomizeBeanDefinitionRegistryPostProcessor implements BeanDefinitionRegistryPostProcessor {
    @Override
    public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry beanDefinitionRegistry) throws BeansException {

        //创建一个bean的定义类的对象，bean类型是CalculateServiceImpl
        RootBeanDefinition helloBean1 = new RootBeanDefinition(HelloServiceImplV1.class);
        RootBeanDefinition helloBean2 = new RootBeanDefinition(HelloServiceImplV2.class);
        //bean的定义注册到spring环境
        beanDefinitionRegistry.registerBeanDefinition("helloServiceImplV1", helloBean1);
        beanDefinitionRegistry.registerBeanDefinition("helloServiceImplV2", helloBean2);
    }

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory configurableListableBeanFactory) throws BeansException {
        //打印当前堆栈信息
        //Utils.printTrack("execute postProcessBeanFactory");
        System.out.println("abc");
    }
}