Spring ApplicationListener的使用详解

介绍

Spring ApplicationListener 是Spring事件机制的一部分,与ApplicationEvent抽象类结合完成ApplicationContext的事件通知机制.

ContextRefreshedEvent事件监听

以Spring的内置事件ContextRefreshedEvent为例,当ApplicationContext被初始化或刷新时，会触发ContextRefreshedEvent事件.如下代码示例:

@Componentpublic class LearnListener implements ApplicationListener<ContextRefreshedEvent> { @Override public void onApplicationEvent(ContextRefreshedEvent event) { //获取所有的bean String[] definitionNames = event.getApplicationContext().getBeanDefinitionNames(); for (String name : definitionNames) { //打印名称 System.out.println('name = ' + name); } }}

自定义事件

代码

//继承ApplicationEvent 抽象类就可以自定义事件模型public class MyEvent extends ApplicationEvent { private Long id; private String message; public MyEvent(Object source) { super(source); } public MyEvent(Object source, Long id, String message) { super(source); this.id = id; this.message = message; } //get set 方法省略}

//实现ApplicationListener接口 @Componentpublic class MyListener implements ApplicationListener<MyEvent> { @Override public void onApplicationEvent(MyEvent event) { System.out.println('监听到事件: '+event.getId()+'t'+event.getMessage()); }}

测试

@SpringBootTest@RunWith(SpringRunner.class)public class ListenerTest { @Autowired private ApplicationContext applicationContext; @Test public void testListenner() { MyEvent myEvent = new MyEvent('myEvent', 9527L, '十二点了 该吃饭了~'); applicationContext.publishEvent(myEvent); // System.out.println('发送结束'); }}

结果

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