Signature sig = pjp.getSignature();
MethodSignature msig = null;
if (!(sig instanceof MethodSignature)) {
    throw new IllegalArgumentException("该注解只能用于方法");
}
msig = (MethodSignature) sig;
Object target = pjp.getTarget();
Method currentMethod = target.getClass().getMethod(msig.getName(), msig.getParameterTypes());