spring的事件监听

Spring的事件监听可以运用到系统的异常事件监听上。
java代码：

package com.spring.test.listener;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

public class LoginAction  implements ApplicationContextAware{

	private ApplicationContext ac;
	public void setApplicationContext(ApplicationContext arg0)
			throws BeansException {
		this.ac = arg0;
		
	}
	
	
	public int login(String username,String password){
		ActionEvent ae = new ActionEvent(username);
		this.ac.publishEvent(ae);
		return 0;
	}

}

package com.spring.test.listener;

import org.springframework.context.ApplicationEvent;

public class ActionEvent extends ApplicationEvent {

	public ActionEvent(Object par){
		super(par);
	}
}

package com.spring.test.listener;

import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;

public class ActionListener implements ApplicationListener {

	public void onApplicationEvent(ApplicationEvent arg0) {
		// TODO Auto-generated method stub
		if(arg0 instanceof ActionEvent){
			System.out.println(arg0.toString());
		}
	}

}

package com.spring.test.listener;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

public class Test {

	public static void main(String[] args) {
		ApplicationContext ac = new FileSystemXmlApplicationContext("/src/applicationContext.xml");
		LoginAction action = (LoginAction)ac.getBean("loginaction");
		action.login("hello", "1234556");
	}
}

运行结果：
2011-08-23 15:19:11 org.springframework.context.support.FileSystemXmlApplicationContext
com.spring.test.listener.ActionEvent[source=hello]