ApplicationContext事件传递进行简单日志处理

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本文介绍了一个基于Spring框架的自定义事件发布机制实现案例，通过创建LogEvent事件类、LogListener监听器类及Log事件发布类，实现了日志记录功能。

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设计思路:

首先定义一个继承ApplicationEvent的类LogEvent,LogEvent通过ApplicationContext被发布出去.

然后定义一个实现ApplicationListener接口的类LogListener,ApplicationContext会在发布LogEvent事件时通

知LogListener.

接着定义一个实现ApplicationContextAware接口的类Log,通过publishEvent()方法进行事件发布,该方法需

传入LogEvent作为参数,发布时会通知LogListener.

示例代码如下:

//LogEvent.java

package com.gc.action;

import org.springframework.context.ApplicationEvent;

//LogEvent类通过ApplictionContext被发布出去
public class LogEvent extends ApplicationEvent{
public LogEvent(Object msg){
super(msg);
}
}

//LogListener.java

package com.gc.action;

import java.text.SimpleDateFormat;
import java.util.Date;

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

public class LogListener implements ApplicationListener{
//ApplicationContext会在发布LogEvent事件时通知LogListener
public void onApplicationEvent(ApplicationEvent event){
if(event instanceof LogEvent){
   //设定时间
   SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
   format.setLenient(false);
   String currentDate = format.format(new Date());
   System.out.println("输出时间: "+currentDate+" 输出内容: "+event.toString());
}
}
}

//Log.java

package com.gc.action;

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

public class Log implements ApplicationContextAware{
//设定变量applicationContext
private ApplicationContext applicationContext;
//set方法
public void setApplicationContext(ApplicationContext applicationContext)
throws BeansException{
this.applicationContext = applicationContext;
}
//通过publishEvent发布事件
public int log(String log){
LogEvent event = new LogEvent(log);
this.applicationContext.publishEvent(event);
return 0;
}
}

//配置文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>

<bean id="log" class="com.gc.action.Log">
</bean>
<bean id="listener" class="com.gc.action.LogListener">
</bean>
</beans>

//TestHelloWorld.java

package com.gc.test;

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

import com.gc.action.Log;

public class TestHelloWorld {
public static void main(String[] args) throws InstantiationException,
IllegalAccessException, ClassNotFoundException {
//通过ApplicationContext获取配置文件
ApplicationContext actx = new FileSystemXmlApplicationContext("config.xml");
Log log = (Log)actx.getBean("log");
log.log("test");
}
}

运行结果:

输出时间: 2009-10-31 21:57:57 输出内容: com.gc.action.LogEvent[source=test]