@Aspect 어노테이션을 이용한 AOP

@Aspect 어노테이션을 이용해서 AOP를 구현하는 과정은 XML스키마 기반의 AOP를 구현하는 과정과 거의 유사하며, 차이점은 다음과 같다.

  ① @Aspect 어노테이션을 이용해서 Aspect 클래스를 구현한다. 이때 Aspect 클래스는 Advice를 구현한 메서드와 Pointcut을 포함한다.

  ② XML 설정에서 <aop:aspectj-autoproxy/>를 설정한다.

 

 

FaqBoardImpl.java

package sp.aop.service; import org.springframework.stereotype.Component;   @Component("faqBoard") public class FaqBoardImpl implements Board {  @Override  public String getBoardName() {   // TODO Auto-generated method stub   return "FAQ Board";  }    @Override  public String checkBoard() {   // TODO Auto-generated method stub   return "N";  } }

 

NoticeBoardImpl.java

package sp.aop.service; import org.springframework.stereotype.Component;   @Component("noticeBoard") public class NoticeBoardImpl implements Board {  @Override  public String getBoardName() {   // TODO Auto-generated method stub   return "Notice Board";  }    @Override  public String checkBoard() {   // TODO Auto-generated method stub   return "Y";  } }

 

BoardController.java

package sp.aop.controller; import javax.annotation.Resource; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.ModelAndView; import sp.aop.service.Board;   public class BoardController extends   org.springframework.web.servlet.mvc.AbstractController {    @Resource(name="noticeBoard")  private Board board;     @Override  protected ModelAndView handleRequestInternal(HttpServletRequest arg0,    HttpServletResponse arg1) throws Exception {   // TODO Auto-generated method stub      System.out.println("<<===== START =====>>");   System.out.println("Board Name-1 : " + board.getBoardName());   System.out.println("Board Check-1 : " + board.checkBoard());   System.out.println("<<===== END =====>>");      return null;  } }

 

LogAspect.java

package sp.aop.aspect; import org.aspectj.lang.ProceedingJoinPoint; import org.aspectj.lang.annotation.Around; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Pointcut;   @Aspect public class LogAspect {    @Pointcut("execution(public * sp.aop.service.*.get*(..))")  private void profileTarget(){};    @Pointcut("execution(public * sp.aop.service.*.check*(..))")  private void checkTarget(){};      @Around("profileTarget()")  public Object allLog(ProceedingJoinPoint joinPoint) throws Throwable{   System.out.println("*");   System.out.println("**");      try{    Object ret = joinPoint.proceed();    return ret;   }finally{    System.out.println("***");    System.out.println("****");   }  }    @Around("checkTarget()")  public Object allCheck(ProceedingJoinPoint joinPoint) throws Throwable{   System.out.println("** check start **");      try{    Object ret = joinPoint.proceed();    return ret;   }finally{    System.out.println("** check end **");   }  }   }

●@Pointcut 어노테이션은 Pointcut을 정의하는 AspectJ 표현식을 값으로 갖게 됨.

●@Pointcut 어노테이션을 적용한 메서드는 리턴 타입이 void 여야 함

●@Pointcut 어노테이션을 이용해서 Pointcut을 정의하면, Advice 관련 어노테이션에서 해당 메서드 이름을 이용해서 Pointcut을 사용할 수 있게 됨. 

 

 

spring302-servlet.xml

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"  xmlns:aop="http://www.springframework.org/schema/aop"  xmlns:context="http://www.springframework.org/schema/context"  xmlns:p="http://www.springframework.org/schema/p"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd        http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context-3.0.xsd        http://www.springframework.org/schema/aop        http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">  <context:annotation-config/>  <aop:aspectj-autoproxy/>  <context:component-scan base-package="sp.aop.service"/>      <!-- HandlerMapping 설정 -->  <bean id="simpleUrlHandlerMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">   <property name="mappings">    <props>     <prop key="/aoptest01.sp">boardController</prop>    </props>   </property>  </bean>    <!-- 각종 bean 설정 -->  <bean id="boardController" class="sp.aop.controller.BoardController"></bean>  <bean id="logAspect" class="sp.aop.aspect.LogAspect"></bean>   </beans>

● <aop:aspectj-autoproxy/> 태그를 사용하게 되면 @Aspect 어노테이션이 적용된 빈 객체를 Aspect로 사용하게 됨. 

 

 

결과

<<===== START =====>> * ** *** **** Board Name-1 : Notice Board ** check start ** ** check end ** Board Check-1 : Y <<===== END =====>>

 

 

 

[참고자료] Spring 3.0 프로그래밍-최범균