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spring 事件(Application Event)

spring 事件为bean 与 bean之间传递消息。一个bean处理完了希望其余一个接着处理.这时我们就需要其余的一个bean监听当前bean所发送的事件.

 

spring事件使用步骤如下:

1.先自定义事件:你的事件需要继承 ApplicationEvent

2.定义事件监听器: 需要实现 ApplicationListener

3.使用容器对事件进行发布

 

以下例子是场景是注册的时候发送邮件的一个场景:

先定义事件:

package com.foreveross.service.weixin.test.springevent;import org.springframework.context.ApplicationEvent;/** * 自定义一个事件 * @author mingge * */public class DemoEvent extends ApplicationEvent{        private String msg;        private String email;    public DemoEvent(Object source,String msg,String email) {        super(source);        this.msg=msg;        this.email=email;    }    public String getMsg() {        return msg;    }    public void setMsg(String msg) {        this.msg = msg;    }    public String getEmail() {        return email;    }    public void setEmail(String email) {        this.email = email;    }    }

然后定义事件监听器:

package com.foreveross.service.weixin.test.springevent;import org.springframework.context.ApplicationListener;import org.springframework.scheduling.annotation.Async;import org.springframework.stereotype.Component;/** * 定义一个事件监听类 * @author mingge * */@Componentpublic class DemoEventListener implements ApplicationListener<DemoEvent>{    //使用注解@Async支持 这样不仅可以支持通过调用,也支持异步调用,非常的灵活,    @Async    @Override    public void onApplicationEvent(DemoEvent event) {        System.out.println("注册成功,发送确认邮件为:" + event.getEmail()+",消息摘要为:"+event.getMsg());      }}

再次使用容器对事件进行发布:

package com.foreveross.service.weixin.test.springevent;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.ApplicationContext;import org.springframework.stereotype.Component;/** * 事件发布类 * @author mingge * */@Componentpublic class DemoEventPublisher {        @Autowired    private ApplicationContext applicationContext;        public void pushlish(String msg,String mail){        applicationContext.publishEvent(new DemoEvent(this, msg,mail));    }    }

最后就是测试了:

package com.foreveross.service.weixin.test.springevent;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;@Configuration@ComponentScan("com.foreveross.service.weixin.test.springevent")public class EventConfig {}
package com.foreveross.service.weixin.test.springevent;import org.springframework.context.annotation.AnnotationConfigApplicationContext;/** * 事件测试类 * @author mingge * */public class EventTest {    public static void main(String[] args) {        AnnotationConfigApplicationContext context=new AnnotationConfigApplicationContext(EventConfig.class);        DemoEventPublisher demoEventPublisher=context.getBean(DemoEventPublisher.class);        demoEventPublisher.pushlish("张三1","565792147@qq.com");        demoEventPublisher.pushlish("张三2","565792147@qq.com");        demoEventPublisher.pushlish("张三3","565792147@qq.com");        demoEventPublisher.pushlish("张三4","565792147@qq.com");        demoEventPublisher.pushlish("张三5","565792147@qq.com");        context.close();    }}

 

参考:http://blog.csdn.net/it_man/article/details/8440737

 

spring 事件(Application Event)