Bean对象不同的方式注入，是不同的annotation接口描述

假设的两个类：

第一个

package biz.baijing.definition;import ...@Configuration
public class BaiJingConfig {@Bean // ConfigurationClassBeanDefinitionReader$ConfigurationClassBeanDefinitionpublic String bjConf() {return "Baijing Configuration";}
}

第二个

package biz.baijing.definition;import ...@Component       // ScannedGenericBeanDefinition
public class BaiJing {
}

演示的结果

package biz.baijing;import ...@SpringBootApplication
public class BizBaiJingApplication
{public static void main( String[] args ){ConfigurableApplicationContext run = SpringApplication.run(BizBaiJingApplication.class, args);// 获取 BeanDefinition 对象ConfigurableListableBeanFactory beanFactory = run.getBeanFactory();//class org.springframework.context.annotation.ScannedGenericBeanDefinitionBeanDefinition baiJing = beanFactory.getBeanDefinition("baiJing"); //class org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader$ConfigurationClassBeanDefinitionBeanDefinition bjConf = beanFactory.getBeanDefinition("bjConf");System.out.println(baiJing.getClass());System.out.println(bjConf.getClass());}
}

@Bean

ScannedGenericBeanDefinition

@Componet

@Service

@Controller

……

ConfigurationClassBeanDefinition