spring 事件(Application Event)

spring 事件為bean 與 bean之間傳遞消息。一個bean處理完了希望其余一個接着處理.這時我們就需要其余的一個bean監聽當前bean所發送的事件.

 

spring事件使用步驟如下:

1.先自定義事件：你的事件需要繼承 ApplicationEvent

2.定義事件監聽器: 需要實現 ApplicationListener

3.使用容器對事件進行發布

 

以下例子是場景是注冊的時候發送郵件的一個場景:

先定義事件:

package com.foreveross.service.weixin.test.springevent;

import org.springframework.context.ApplicationEvent;

/**
 * 自定義一個事件
 * @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;
    }
    
}

然后定義事件監聽器:

package com.foreveross.service.weixin.test.springevent;

import org.springframework.context.ApplicationListener;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;


/**
 * 定義一個事件監聽類
 * @author mingge
 *
 */
@Component
public class DemoEventListener implements ApplicationListener<DemoEvent>{

    //使用注解@Async支持 這樣不僅可以支持通過調用，也支持異步調用，非常的靈活，
    @Async
    @Override
    public void onApplicationEvent(DemoEvent event) {
        System.out.println("注冊成功，發送確認郵件為：" + event.getEmail()+",消息摘要為:"+event.getMsg());  
    }

}

再次使用容器對事件進行發布:

package com.foreveross.service.weixin.test.springevent;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Component;

/**
 * 事件發布類
 * @author mingge
 *
 */
@Component
public class DemoEventPublisher {
    
    @Autowired
    private ApplicationContext applicationContext;
    
    public void pushlish(String msg,String mail){
        applicationContext.publishEvent(new DemoEvent(this, msg,mail));
    }
    
}

最后就是測試了:

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;

/**
 * 事件測試類
 * @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("張三1","[e-mail]");
        demoEventPublisher.pushlish("張三2","[e-mail]");
        demoEventPublisher.pushlish("張三3","[e-mail]");
        demoEventPublisher.pushlish("張三4","[e-mail]");
        demoEventPublisher.pushlish("張三5","[e-mail]");
        context.close();
    }
}

 

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