ApplicationContext time mechanism

The ApplicationContext event mechanism in spring is simple, container event: applicationevent, Listener: Applicationlistener, triggers the method in the listener when the event occurs.

See an example:

Package applicationcontextevent;


Import org.springframework.context.ApplicationEvent;
Import Org.springframework.context.ApplicationListener;
Import org.springframework.context.event.ContextRefreshedEvent;


public class MyListener implements Applicationlistener {


public void Onapplicationevent (Applicationevent arg0) {

if (arg0 instanceof contextrefreshedevent)//contextrefreshedevent represents initializing a container or refreshing a container event
{

System.out.println ("-------------");
}
}
}

Then configure the event listener in the XML:

<bean id= "MyListener" class= "Applicationcontextevent.mylistener" >
</bean>

When we call new Classpathapplicationcontext (...). ), the event is triggered

The above contextrefershedevent is automatically triggered, if we want to define an event of our own (not applicationcontext built-in), we need to manually pass the ApplicationContext pulishevent (event source) to trigger an event

ApplicationContext time mechanism