在切入点内获取带注释的参数 [英] Get annotated parameters inside a pointcut

问题描述

我有两个注释 @LookAtThisMethod 和 @LookAtThisParameter ，如果我在方法周围用<$切入c $ c> @LookAtThisMethod 我如何提取所述方法的参数，这些参数用 @LookAtThisParameter 注释？

I have two annotation @LookAtThisMethod and @LookAtThisParameter, if I have a pointcut around the methods with @LookAtThisMethod how could I extract the parameters of said method which are annotated with @LookAtThisParameter?

例如：

@Aspect
public class LookAdvisor {

    @Pointcut("@annotation(lookAtThisMethod)")
    public void lookAtThisMethodPointcut(LookAtThisMethod lookAtThisMethod){}

    @Around("lookAtThisMethodPointcut(lookAtThisMethod)")
    public void lookAtThisMethod(ProceedingJoinPoint joinPoint, LookAtThisMethod lookAtThisMethod) throws Throwable {
        for(Object argument : joinPoint.getArgs()) {
            //I can get the parameter values here
        }

        //I can get the method signature with:
        joinPoint.getSignature.toString();


        //How do I get which parameters  are annotated with @LookAtThisParameter?
    }

}

推荐答案

我根据其他答案为我的解决方案建模一个不同但相似的问题。

I modeled my solution around this other answer to a different but similar question.

MethodSignature signature = (MethodSignature) joinPoint.getSignature();
String methodName = signature.getMethod().getName();
Class<?>[] parameterTypes = signature.getMethod().getParameterTypes();
Annotation[][] annotations = joinPoint.getTarget().getClass().getMethod(methodName,parameterTypes).getParameterAnnotations();

我必须通过目标类的原因是因为注释的类是一个实现接口，因此 signature.getMethod（）。getParameterAnnotations（）返回null。

The reason that I had to go through the target class was because the class that was annotated was an implementation of an interface and thusly signature.getMethod().getParameterAnnotations() returned null.

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