Spring 事件

自定义事件继承ApplicationEvent

public class MyEvent extends ApplicationEvent
{
    private String message;
    
    public MyEvent(Object source) 
    {
        super(source);
        
    }

    public MyEvent(Object source, String message) {
        super(source);
        this.message = message;
    }
    
    public void print()
    {
        System.out.println("my message is :"+message);
    }
}

自定义监听器实现ApplicationListener

@Component("myListener")//注入监听器
public class MyEventListener implements ApplicationListener
{
    @Override
    public void onApplicationEvent(ApplicationEvent event) 
    {
        if (event instanceof MyEvent)
        {
            ((MyEvent)event).print();
        }
        
    }

}

测试：

public class Test {

	public static void main(String[] args) 
	{		
		ApplicationContext bf =   new ClassPathXmlApplicationContext("spring2.xml");

		MyEvent event = new MyEvent("hello", "this is my message");
		bf.publishEvent(event);
		//System.out.println(u2);

	}

}

　　输出：my message is :this is my message