Spring AOP의 핵심 개념과 기능 살펴보기

<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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.springframework.org/schema/aop
                           http://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--定义切面-->
    <bean id="myAspect" class="com.example.MyAspect"/>

    <!--定义切点-->
    <aop:config>
        <aop:pointcut id="myPointcut" expression="execution(* com.example.MyService.*(..))"/>
    </aop:config>

    <!--定义通知-->
    <aop:config>
        <aop:aspect id="myAdvisor" ref="myAspect">
            <aop:before pointcut-ref="myPointcut" method="beforeAdvice"/>
            <aop:after-returning pointcut-ref="myPointcut" method="afterReturningAdvice"/>
            <aop:after-throwing pointcut-ref="myPointcut" method="afterThrowingAdvice"/>
        </aop:aspect>
    </aop:config>

    <!--定义目标对象-->
    <bean id="myService" class="com.example.MyService"/>

</beans>

// 定义切面
@Aspect
@Component
public class MyAspect {

    @Pointcut("execution(* com.example.MyService.*(..))")
    public void myPointcut() {}

    @Before("myPointcut()")
    public void beforeAdvice() {
        // 执行前置建议的逻辑
    }

    @AfterReturning("myPointcut()")
    public void afterReturningAdvice() {
        // 执行返回建议的逻辑
    }

    @AfterThrowing("myPointcut()")
    public void afterThrowingAdvice() {
        // 执行异常建议的逻辑
    }
}

// 定义目标对象
@Component
public class MyService {

    public void doSomething() {
        // 执行业务逻辑
    }
}

// 应用程序入口
public class Application {

    public static void main(String[] args) {
        ApplicationContext context = new AnnotationConfigApplicationContext(Application.class);
        MyService myService = context.getBean(MyService.class);
        myService.doSomething();
    }
}