一 spring的原生接口说明
1.1 接口说明
Aware是Spring框架提供的一组特殊接口,可以让Bean从Spring容器中拿到一些资源信息。
BeanFactoryAware:实现该接口,可以访问BeanFactory对象,从而获取Bean在容器中的相关信息。
EnvironmentAware:实现该接口,可以访问Environment对象,从而获取环境相关的配置属性,比如系统属性、环境变量等。
ResourceLoaderAware:实现该接口,可以访问ResourceLoader对象,从而获取资源加载器,用于加载类路径下的资源文件。
MessageSourceAware:实现该接口,可以访问MessageSource对象,从而获取国际化消息。
1.2 案例说明
1.打印耗时
package com.ljf.springboot.mybaits.demos.config;/*** @ClassName: TimeCostBeanPostProcessor* @Description: TODO* @Author: admin* @Date: 2025/06/29 17:48:32 * @Version: V1.0**/import com.google.common.collect.Maps;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.stereotype.Component;import java.util.Map;
/**
* @author admin
* @description
这个类实现了Spring框架的BeanPostProcessor接口,用于在bean初始化前后记录每个bean的创建时间成本
* @param
* @return
*/
@Component
public class TimeCostBeanPostProcessor implements BeanPostProcessor {private Map<String, Long> costMap = Maps.newConcurrentMap();private Long costSumTime = 0L;@Overridepublic Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {costMap.put(beanName, System.currentTimeMillis());return bean;}@Overridepublic Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {if (costMap.containsKey(beanName)) {Long start = costMap.get(beanName);long cost = System.currentTimeMillis() - start;if (cost > 0) {costMap.put(beanName, cost);System.out.println("bean: " + beanName + "\ttime: " + cost);}}return bean;}
}
2.监控事件
package com.ljf.springboot.mybaits.demos.config;/*** @ClassName: ApplicationEventListener* @Description: TODO* @Author: admin* @Date: 2025/06/29 17:44:41 * @Version: V1.0**/import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;
/**
* @author admin
* @description
这个类实现了Spring框架的ApplicationListener<ApplicationEvent>接口,用于监听并处理应用上下文中的事件。
* @param
* @return
*/
@Component
public class ApplicationEventListener implements ApplicationListener<ApplicationEvent> {private static final Logger logger = LoggerFactory.getLogger(ApplicationEventListener.class);@Overridepublic void onApplicationEvent(ApplicationEvent event) {logger.info("=======event received : {}", event.getClass().getName());}
}
测试案例结果: