SpringBoot加载应用事件监听器

Posted 2020-12-07 fjf3997

SpringBoot加载应用事件监听器

利用 Spring 工厂加载机制，实例化 ApplicationListener 实现类，并排序对象集合

创建应用事件监听器

• 创建类实现接口ApplicationListener,可以使用@Order或实现Orderd接口进行排序

@Order(Ordered.HIGHEST_PRECEDENCE)
public class HelloWorldApplicationListener implements ApplicationListener<ContextRefreshedEvent> {
    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
        System.out.println("HelloWorld : " + event.getApplicationContext().getId()
                + " , timestamp : " + event.getTimestamp());
    }
}

public class AfterHelloWorldApplicationListener implements ApplicationListener<ContextRefreshedEvent>,Ordered {
    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
        System.out.println("AfterHelloWorld : " + event.getApplicationContext().getId()
                + " , timestamp : " + event.getTimestamp());
    }
    @Override
    public int getOrder() {
        return Ordered.LOWEST_PRECEDENCE;
    }
}

• 在spring.properties中配置

# ApplicationListener
org.springframework.context.ApplicationListener=com.imooc.diveinspringboot.listener.AfterHelloWorldApplicationListener,com.imooc.diveinspringboot.listener.HelloWorldApplicationListener,

• 输出

HelloWorld : application , timestamp : 1591105193644
AfterHelloWorld : application , timestamp : 1591105193644