Spring AOP

By xml

public class PaymentApply {
	
    public void apply() {
		
	String user = "user1";
	String payment = "pay for dinner";
		
	System.out.println(user+","+payment);
   }
}

public class Notification {
	
    public void sendNotification() {
		
        System.out.println("send message to : ");
    }
}

<bean id="paymentApply" class="example.my.spring.aop.PaymentApply" />
	
    <bean id="notification" class="example.my.spring.aop.Notification" />
	
    <aop:config>
	<aop:aspect id="myAspect" ref="notification" >
		<aop:pointcut id="afterPointCut" expression="execution(* example.my.spring.aop.PaymentApply.*(..))" />
		<aop:after method="sendNotification" pointcut-ref="afterPointCut" />
	</aop:aspect>
    </aop:config>

By annotation

<aop:aspectj-autoproxy/>
<bean id="paymentApply" class="example.my.spring.aop.PaymentApply" />
<bean id="notification" class="example.my.spring.aop.Notification" />

@Aspect
public class Notification {
	
    @Pointcut("execution(* example.my.spring.aop.PaymentApply.apply(..))")
    private void beforePointCunt() {}
	
    @Before("beforePointCunt()")
    public void sendNotification() {
		
	System.out.println("send message to in aop annotation ");
    }
	
}

Advice

Pointcut expression