Spring事件Application Event

package event;

import org.springframework.context.ApplicationEvent;

/**
 * @Description: 自定义事件
 */
public class DemoEvent extends ApplicationEvent {

    private String msg;

    /**
     * Create a new ApplicationEvent.
     *
     * @param source the object on which the event initially occurred (never {@code null})
     */
    public DemoEvent(Object source,String msg) {
        super(source);
        this.msg = msg;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }
}

package event;

import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;

/**
 * @Description: 事件监听器
 */
@Component
public class DemoListener implements ApplicationListener<DemoEvent> {
    @Override
    public void onApplicationEvent(DemoEvent event) {
        String msg = event.getMsg();
        System.out.println(msg);
    }
}

package event;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Component;

/**
 * @Description: 事件发布类
 */
@Component
public class DemoPublisher {
    @Autowired
    private ApplicationContext applicationContext;

    public void publish(String msg){

        applicationContext.publishEvent(new DemoEvent(this,msg));

    }
}

package event;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

/**
 * @Description:配置类
 */
@Configuration
@ComponentScan("event")
public class EventConfig {
    
}

package event;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

/**
 * @Description:测试类
 */
public class Main {

    public static void main(String[] args) {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(EventConfig.class);
        DemoPublisher demoPublisher = context.getBean(DemoPublisher.class);
        demoPublisher.publish("Spring触发事件!");
        context.close();
    }
}