/*** description** @author 70KG* @date 2018/11/13*/
public class MyImportBeanDefinitionRegistrar implements ImportBeanDefinitionRegistrar {@Overridepublic void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {// 获取容器中已经存在的Bean的名字boolean definition1 = registry.containsBeanDefinition("com.nmys.story.springCore.springioc.importBean.Cat");boolean definition2 = registry.containsBeanDefinition("com.nmys.story.springCore.springioc.importBean.Dog");if (definition1 && definition2) {// 将需要放入容器中的Bean用RootBeanDefinition来包装一下。RootBeanDefinition beanDefinition = new RootBeanDefinition(Pig.class);// 向容器中注册这个Bean，并给定一个名字。registry.registerBeanDefinition("pig", beanDefinition);}}
}

/*** description** @author 70KG* @date 2018/11/13*/
@Configuration
@Import(value = {Cat.class, Dog.class, MyImportBeanDefinitionRegistrar.class})
public class MyImportBeanDefinitionRegistrarConfig {}

/*** description** @author 70KG* @date 2018/11/13*/
public class Test02 {@Testpublic void test() {// IOC容器创建(容器类似一个Map)AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(MyImportBeanDefinitionRegistrarConfig.class);System.out.println("IOC容器初始化完成。。。。。");// 从容器中获取所有的bean的IDString[] definitionNames = ac.getBeanDefinitionNames();for (String name : definitionNames) {System.out.println("------->" + name);}}}

IOC容器初始化完成。。。。。
------->org.springframework.context.annotation.internalConfigurationAnnotationProcessor
------->org.springframework.context.annotation.internalAutowiredAnnotationProcessor
------->org.springframework.context.annotation.internalRequiredAnnotationProcessor
------->org.springframework.context.annotation.internalCommonAnnotationProcessor
------->org.springframework.context.event.internalEventListenerProcessor
------->org.springframework.context.event.internalEventListenerFactory
------->myImportBeanDefinitionRegistrarConfig
------->com.nmys.story.springCore.springioc.importBean.Cat
------->com.nmys.story.springCore.springioc.importBean.Dog
------->pig