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Spring的事件(Application Event)为Bean与Bean之间的消息通信提供了支持。
当一个Bean处理完一个任务之后,希望另一个Bean知道并能做出相应的处理,这时我们就需要让另外一个Bean监听当前Bean所发送的事件。Spring的事件需要遵循如下流程:
1、自定义事件,集成ApplicationEvent。 2、定义事件监听器,实现ApplicationListener 3、使用容器发布容器进行本示例的演示,需要先配置好Maven和Spring哦、
见:下面直接上示例吧。
package cn.hncu.p2_5_2ApplicationEvent;import org.springframework.context.ApplicationEvent;/** * Created with IntelliJ IDEA. * User: 陈浩翔. * Date: 2016/11/15. * Time: 下午 8:39. * Explain:自定义事件 */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; System.out.println(this.getClass()+",构造方法"); } public String getMsg() { return msg; } public void setMsg(String msg) { this.msg = msg; }}
package cn.hncu.p2_5_2ApplicationEvent;import org.springframework.context.ApplicationListener;import org.springframework.stereotype.Component;/** * Created with IntelliJ IDEA. * User: 陈浩翔. * Date: 2016/11/15. * Time: 下午 8:50. * Explain:事件监听器 */@Componentpublic class DemoListener implements ApplicationListener{ //实现ApplicationListener接口,并指定监听的事件类型 @Override public void onApplicationEvent(DemoEvent demoEvent) { //使用onApplicationEvent方法对消息进行接受处理 String msg = demoEvent.getMsg(); System.out.println(this.getClass()+"监听到了bean-demoPublisher发布的消息:"+msg); }}
package cn.hncu.p2_5_2ApplicationEvent;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.ApplicationContext;import org.springframework.stereotype.Component;/** * Created with IntelliJ IDEA. * User: 陈浩翔. * Date: 2016/11/15. * Time: 下午 10:39. * Explain:事件发布类 */@Componentpublic class DemoPublisher { @Autowired ApplicationContext applicationContext;//注入ApplicationContext用来发布事件 public void publish(String msg){ DemoEvent demoEvent = new DemoEvent(this,msg); applicationContext.publishEvent(demoEvent);//在这里的时候,会去运行DemoListener中的onApplicationEvent方法 System.out.println("消息:"+demoEvent.getMsg()); //使用ApplicationContext的publishEvent方法来发布 }}
package cn.hncu.p2_5_2ApplicationEvent;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;/** * Created with IntelliJ IDEA. * User: 陈浩翔. * Date: 2016/11/15. * Time: 下午 10:46. * Explain:配置类 */@Configuration@ComponentScan("cn.hncu.p2_5_2ApplicationEvent")public class EventConfig { }
package cn.hncu.p2_5_2ApplicationEvent;import org.springframework.context.annotation.AnnotationConfigApplicationContext;/** * Created with IntelliJ IDEA. * User: 陈浩翔. * Date: 2016/11/15. * Time: 下午 10:47. * Explain:运行类 */public class Main { public static void main(String[] args) { AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(EventConfig.class); DemoPublisher demoPublisher = context.getBean(DemoPublisher.class); demoPublisher.publish("hello 你好..."); context.close(); }}
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