Spring中事件处理的小技巧[4]

java 代码

import orgspringframeworkcontextApplicationEvent;

import orgspringframeworkcontextApplicationListener;

public class MessageEventListener implements ApplicationListener {

@Override

public void onApplicationEvent(ApplicationEvent event) {

// TODO Autogenerated method stub

if(event instanceof MessageEvent){

MessageEvent msEvent = (MessageEvent)event;

Systemoutprintln(Received: + msEventgetMessage());

}

}

}

在运行期ApplicationContext会自动在当前的所有Bean中寻找ApplicationListener接口的实现并将其作为事件接收对象当ApplicationpublishEvent方法调用时所有的ApplicationListener接口实现都会被激发每个ApplicationListener可根据事件的类型判断是否是自己需要处理的事件如上面的ActionListener只处理ActionEvent事件

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