spring 启动打印所有beans

1.自定义类实现BeanPostProcessor接口

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;

public class InstantiationTracingBeanPostProcessor implements BeanPostProcessor {

    // simply return the instantiated bean as-is
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        return bean; // we could potentially return any object reference here...
    }
    //在创建bean后输出bean的信息
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("Bean '" + beanName + "' created : " + bean.toString());
        return bean;
    }
}

将类注册到spring的applicationContext.xml文件即可

<!-- 查看spring启动注册的bean -->
<bean class="stt.core.utils.spring.InstantiationTracingBeanPostProcessor" />

项目启动，即可打印。

默认情况下，这些beans是单例的，在spring启动时被装配，当然有可以修改默认。