spring 事件(Application Event)

Posted 2020-08-24 全力以赴001

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
 *
 */
@Component
public 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
 *
 */
@Component
public 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","[email protected]");
        demoEventPublisher.pushlish("张三2","[email protected]");
        demoEventPublisher.pushlish("张三3","[email protected]");
        demoEventPublisher.pushlish("张三4","[email protected]");
        demoEventPublisher.pushlish("张三5","[email protected]");
        context.close();
    }
}

 

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