Spring Application Framework 2.0お試し

AOPをちょっとためしてみた
Adviceを作ってみる

package org.sample.spring;

import org.aspectj.lang.ProceedingJoinPoint;

public class TraceAdvice {
	public void around(ProceedingJoinPoint pjp) throws Throwable {
		System.out.println("before");
		pjp.proceed();
		System.out.println("after");
	}
}

applicationContext.xmlはこんなの

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:util="http://www.springframework.org/schema/util"
	xsi:schemaLocation="
		http://www.springframework.org/schema/beans 
		http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
		http://www.springframework.org/schema/aop 
		http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
		http://www.springframework.org/schema/util 
		http://www.springframework.org/schema/util/spring-util-2.0.xsd
		http://www.springframework.org/schema/tx 
		http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">
	<aop:config>
		<aop:aspect id="myAspect" ref="myAdvice">
			<aop:pointcut id="myAspectPc" expression="execution(* org.sample..*.greet(..))" />
			<aop:around pointcut-ref="myAspectPc" method="around" />
		</aop:aspect>
	</aop:config>
	
	<bean id="messenger" class="org.sample.spring.MessengerImpl">
		<property name="message" value="Hello world"></property>
	</bean>
	<bean id="myAdvice" class="org.sample.spring.TraceAdvice" />
</beans>

MessengerとMessengerImplは簡単に

package org.sample.spring;

public interface Messenger {
	void greet();
}

package org.sample.spring;

public class MessengerImpl implements Messenger {
	private String message;

	public String getMessage() {
		return message;
	}

	public void setMessage(String message) {
		this.message = message;
	}

	public void greet() {
		System.out.println(message);
	}

}

メインをこんな感じに

package org.sample.spring;

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

public class Main {
	public static void main(String[] args) {
		ApplicationContext ctx = new ClassPathXmlApplicationContext(
				"applicationContext.xml");
		Messenger bean = (Messenger) ctx.getBean("messenger");
		bean.greet();
	}
}

実行すると

before
Hello world
after

こんな具合。
アスペクト成功〜。