Question

我用
定义了注释 @Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)

当我在要表达方面的方法下使用自定义注释时，然后我想获取方法签名的参数（它们是Object，而不是字符串，整数字节）。

是否有一种简单的方法来获取带有AOP自定义注释的方法参数？

Answer 1

一个简单的演示可以是：

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface MethodTimer {
}

以及方面处理程序：

@Aspect
@Slf4j
@Component
public class TimeCounterAspect {
    @Around("@annotation(methodTimer)")
    public Object logMethodRequests(ProceedingJoinPoint joinPoint, MethodTimer methodTimer)
            throws Throwable {
        Long start = System.currentTimeMillis();
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        Method method = signature.getMethod();
        String methodName = method.getName();
        Object[] myArgs = joinPoint.getArgs();
        Object obj = null;
        try {
            obj = joinPoint.proceed();
        } catch (Exception e) {
            throw e;
        } finally {
                log.info("Retrieving timeCost: {} ms in Method: {} args: {}",
                System.currentTimeMillis() - start, methodName, Arrays.deepToString(myArgs));
        }
        return obj;
    }
}

Answer 2

您可以通过ProceedingJoinPoint访问参数：

@Around("execution(@com.path.annotation.YourAnnotation * *(..)) && @annotation(annotation)")
public Object execute(final ProceedingJoinPoint pjp, final YourAnnotation annotation) throws Throwable {
    Object result = pjp.proceed();
    // Here is the method arguments
    Object[] args = pjp.getArgs();

    return result;
}

传递带有自定义批注AOP

2 个答案: