Bean 的生命周期 ​

import jakarta.annotation.PostConstruct;
import jakarta.annotation.PreDestroy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.stereotype.Component;


/**
 * bean 的生命周期
 *
 * @author 朔风
 * @date 2026-01-13 14:12
 */
@Component
public class HelloSpringBean implements InitializingBean, BeanPostProcessor {
    private static final Logger logger = LoggerFactory.getLogger(HelloSpringBean.class);

    /***
     * 在依赖注入完成之后就会执行
     *
     * @author 朔风
     * @date 2026/1/13 14:13

     * @return void
     */
    @PostConstruct
    public void init() {
        logger.info("HelloSpringBean init ...");
    }

    /***
     * 在 BeanFactory 完成属性设置之后执行的, 实现 InitializingBean 接口
     *
     * @author 朔风
     * @date 2026/1/13 14:20
     * @return void
     */
    @Override
    public void afterPropertiesSet() throws Exception {
        logger.info("HelloSpringBean afterPropertiesSet ...");
    }

    /***
     * bean 初始化前置方法
     *
     * @author 朔风
     * @date 2026/1/13 14:19
     * @param bean bean
     * @param beanName beanName
     * @return java.lang.Object
     */
    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        if (bean instanceof IUserInfoService) {
            logger.info("HelloSpringBean postProcessBeforeInitialization ....");
        }
        return bean;
    }

    /***
     * bean 初始化后置方法
     *
     * @author 朔风
     * @date 2026/1/13 14:19
     * @param bean bean
     * @param beanName beanName
     * @return java.lang.Object
     */
    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        if (bean instanceof IUserInfoService) {
            logger.info("HelloSpringBean postProcessAfterInitialization  ....");
        }
        return bean;
    }

    /***
     * 销毁 bean 的时候回调
     *
     * @author 朔风
     * @date 2026/1/13 14:19
     * @return void
     */
    @PreDestroy
    public void destroy() {
        logger.info("HelloSpringBean destroy....");
    }

}