spring - @Pointcut 和@Around 可以在不同的类中吗？

Question

我是 AOP 的新手。我在 AOP 的帮助下制作了一个通用的日志记录 API，其中定义了建议。

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;
import org.springframework.util.StopWatch;


@Component
@Aspect
public class LogExecutionTime {
  private static final String LOG_MESSAGE_FORMAT = "%s.%s execution time: %dms";
  private static final Log LOG =   LogFactory.getLog(LogExecutionTime.class);

  @Around("myPointCut()")
  public Object logTimeMethod(ProceedingJoinPoint joinPoint) throws Throwable {
    System.out.println("Inside aAdvice LogExecutionTime");
    StopWatch stopWatch = new StopWatch();
    stopWatch.start();
    Object retVal = joinPoint.proceed();
    stopWatch.stop();
    logExecutionTime(joinPoint, stopWatch);
    return retVal;
  }
  private void logExecutionTime(ProceedingJoinPoint joinPoint, StopWatch stopWatch) {
    String logMessage = String.format(LOG_MESSAGE_FORMAT, joinPoint.getTarget().getClass().getName(), joinPoint.getSignature().getName());
    LOG.info(logMessage.toString());
  }
}

现在我已经将这个 jar 包含在我的应用程序代码中并编写了切入点。

import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

@Component
@Aspect
public class ButterflyPointCut {

    @Pointcut("execution(* com.*.Abc.methodName(..))")
    public void myPointCut(){ 
        System.out.println("Executed");
    }

}

报如下错误，我想知道是不是因为class不同，我已经把jar包放在component scan里了。

 Caused by: java.lang.IllegalArgumentException: error at ::0 can't find referenced pointcut myPointCut
        at org.aspectj.weaver.tools.PointcutParser.parsePointcutExpression(PointcutParser.java:317)
        at org.springframework.aop.aspectj.AspectJExpressionPointcut.buildPointcutExpression(AspectJExpressionPointcut.java:217)
        at org.springframework.aop.aspectj.AspectJExpressionPointcut.checkReadyToMatch(AspectJExpressionPointcut.java:190)
        at org.springframework.aop.aspectj.AspectJExpressionPointcut.getClassFilter(AspectJExpressionPointcut.java:169)
        at org.springframework.aop.support.AopUtils.canApply(AopUtils.java:220)
        at org.springframework.aop.support.AopUtils.canApply(AopUtils.java:279)
        at org.springframework.aop.support.AopUtils.findAdvisorsThatCanApply(AopUtils.java:311)
        at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findAdvisorsThatCanApply(AbstractAdvisorAutoProxyCreator.java:119)
        at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findEligibleAdvisors(AbstractAdvisorAutoProxyCreator.java:89)
        at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.getAdvicesAndAdvisorsForBean(AbstractAdvisorAutoProxyCreator.java:70)
        at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:346)
        at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:298)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:422)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1588)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
        ... 57 common frames omitted

Answer 1

您还可以将切入点方法的完整限定名称(您在单独的类中定义)与周围注释一起使用。例如:

这里需要用around注解提及切入点方法的全限定名例如。 @Around("domain.package.class.myPointCutMethodName()")

@Around("domain.package.className.myPointCut()")
  public Object logTimeMethod(ProceedingJoinPoint joinPoint) throws Throwable {
    System.out.println("Inside aAdvice LogExecutionTime");
    StopWatch stopWatch = new StopWatch();
    stopWatch.start();
    Object retVal = joinPoint.proceed();
    stopWatch.stop();
    logExecutionTime(joinPoint, stopWatch);
    return retVal;
  }