Spring学习(二十九)-ApplicationListener用法

ゞ浴缸里的玫瑰 2024-02-19 16:11 44阅读 0赞

ApplicationListener：

监听容器中发布的事件。事件驱动模型开发；

源码：

//监听 ApplicationEvent 及其下面的子事件
    public interface ApplicationListener<E extends ApplicationEvent> extends EventListener {
    
    	/**
    	 * Handle an application event.
    	 * @param event the event to respond to
    	 */
    	void onApplicationEvent(E event);
    
    }

案例：

自定义监听类：

@Component
    public class MyApplicationListener implements ApplicationListener<ApplicationEvent> {
    
    	//当容器中发布此事件以后，方法触发
    	public void onApplicationEvent(ApplicationEvent event) {
    		// TODO Auto-generated method stub
    		System.out.println("收到事件："+event);
    	}
    
    }

配置类:

@ComponentScan("com.spring.ext")
    @Configuration
    public class ExtConfig {
    
    	@Bean
    	public Blue blue(){
    		return new Blue();
    	}
    
    }

测试类：

@Test
    	public void test01(){
    		AnnotationConfigApplicationContext applicationContext  = new AnnotationConfigApplicationContext(ExtConfig.class);
            //发布事件
    		applicationContext.publishEvent(new ApplicationEvent(new String("xxxxxx")) {
    		});
    
    		applicationContext.close();
    	}

结果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzU0OTU3OA_size_16_color_FFFFFF_t_70][]

ContextRefreshedEvent(容器刷新事件)与ContextClosedEvent(容器关闭事件)都是ApplicationEvent的实现类。

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzU0OTU3OA_size_16_color_FFFFFF_t_70]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/c3e1a78fb61642409a49950d2570fb49.png