先对自定义类使用@MyComponet的注解，在设置这个@MyComponet的的属性(一个

@interface接口)，然后，扫描(BaseClassScanUtils.java执行,这文件不重要)当前包下是否有这个注解的类，再用MyComponentBeanFactoryPostProcessor.java(后工厂处理器)执行就行了

MyComponentBeanFactoryPostProcessor.java如下:

package com.itheima.processor;import com.itheima.utils.BaseClassScanUtils;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.BeanDefinitionReaderUtils;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor;
import org.springframework.beans.factory.support.RootBeanDefinition;import java.util.Map;public class MyComponentBeanFactoryPostProcessor implements BeanDefinitionRegistryPostProcessor {@Overridepublic void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {//通过扫描工具去扫描指定包及其子包下的所有类，收集使用@Mycomponent的注解的类Map<String, Class> myComponentAnnotationMap = BaseClassScanUtils.scanMyComponentAnnotation("com.itheima");//遍历Map，组装BeanDefinition进行注册myComponentAnnotationMap.forEach((beanName,clazz)->{//获得beanClassNameString beanClassName = clazz.getName();//com.itheima.beans.OtherBean//创建BeanDefinitionBeanDefinition beanDefinition = new RootBeanDefinition();beanDefinition.setBeanClassName(beanClassName);//注册registry.registerBeanDefinition(beanName,beanDefinition);});}@Overridepublic void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {}
}

 

还要在主配置文件里配置

<bean class="com.itheima.processor.MyComponentBeanFactoryPostProcessor"></bean>