JavaSpring-事件思维导图

(1)自定义事件，集成ApplicationEvent。

(2)定义事件监听器，实现ApplicationListener。

(3)使用容器发布事件。

package com.wisely.highlight_spring4.ch2.event; public class DemoEvent extends ApplicationEvent{ private static final long serialVersionUID = 1L; private String msg; 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 com.wisely.highlight_spring4.ch2.event; @Component //1 实现ApplicationListener接口，并指定监听的事件类型。 public class DemoListener implements ApplicationListener<DemoEvent> { //2 使用onApplicationEvent方法对消息进行接受处理。 public void onApplicationEvent(DemoEvent event) { String msg = event.getMsg(); System.out.println("我(bean-demoListener)接收到了bean-demoPublisher发布的消息:"+ msg); } }

package com.wisely.highlight_spring4.ch2.event; @Component public class DemoPublisher { @Autowired ApplicationContext applicationContext; //1 public void publish(String msg){ applicationContext.publishEvent(new DemoEvent(this, msg)); //2 } }

package com.wisely.highlight_spring4.ch2.event; @Configuration @ComponentScan("com.wisely.highlight_spring4.ch2.event") public class EventConfig { }

package com.wisely.highlight_spring4.ch2.event; public class Main { public static void main(String[] args) { AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(EventConfig.class); DemoPublisher demoPublisher = context.getBean(DemoPublisher.class); demoPublisher.publish("hello application event"); context.close(); } }

我(bean-demoListener)接收到了bean-demoPublisher发布的消息：hello application event