Spring 获取自定义注解所有类

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已于 2023-08-10 15:54:53 修改

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分类专栏： Spring 文章标签： spring java servlet

于 2019-06-11 08:45:51 首次发布

本文链接：https://blog.youkuaiyun.com/wochunyang/article/details/91355797

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本文介绍了一种在Spring框架中实现组件自动扫描和配置的方法，通过实现ApplicationContextAware和ApplicationListener接口，监听ContextRefreshedEvent事件，获取并打印带有特定注解(@ComponentDesc)的Bean信息。

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import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.core.annotation.AnnotationUtils;

import java.lang.annotation.Annotation;
import java.util.Map;
import java.util.Set;


public class ComponentScannerConfigurerBk implements ApplicationListener<ContextRefreshedEvent>, ApplicationContextAware {
    private ComponentScannerConfigurer registrationCenter;


    private ApplicationContext applicationContext;
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    @Override
    public void onApplicationEvent(ContextRefreshedEvent contextRefreshedEvent) {
        Class<? extends Annotation> annotationClass = ComponentDesc.class;
        Map<String,Object> beanWhithAnnotation = applicationContext.getBeansWithAnnotation(annotationClass);
        Set<Map.Entry<String,Object>> entitySet = beanWhithAnnotation.entrySet();
        for (Map.Entry<String,Object> entry :entitySet){
            Class<? extends Object> clazz = entry.getValue().getClass();//获取bean对象
            System.out.println("================"+clazz.getName());
            ComponentDesc componentDesc = AnnotationUtils.findAnnotation(clazz,ComponentDesc.class);
            System.out.println("==================="+componentDesc.channel());

        }
    }
}