我想创建Spring方面，该方面将通过自定义注释注释的方法参数设置为URI模板中的ID标识的特定类的实例。路径变量名称是注释的参数。与Spring非常相似@PathVariable。

因此该控制器方法如下所示：

@RestController
@RequestMapping("/testController")
public class TestController {

    @RequestMapping(value = "/order/{orderId}/delete", method = RequestMethod.GET)
    public ResponseEntity<?> doSomething(
            @GetOrder("orderId") Order order) {

        // do something with order
    }

}

代替经典：

@RestController
@RequestMapping("/testController")
public class TestController {

    @RequestMapping(value = "/order/{orderId}/delete", method = RequestMethod.GET)
    public ResponseEntity<?> doSomething(
            @PathVariable("orderId") Long orderId) {

        Order order = orderRepository.findById(orderId);
        // do something with order
    }
}

注释来源：

// Annotation
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
public @interface GetOrder{

    String value() default "";
}

方面来源：

// Aspect controlled by the annotation
@Aspect
@Component
public class GetOrderAspect {

    @Around( // Assume the setOrder method is called around controller method )
    public Object setOrder(ProceedingJoinPoint jp) throws Throwable{

        MethodSignature signature = (MethodSignature) jp.getSignature();
        @SuppressWarnings("rawtypes")
        Class[] types = signature.getParameterTypes();
        Method method = signature.getMethod();
        Annotation[][] annotations = method.getParameterAnnotations();
        Object[] values = jp.getArgs();

        for (int parameter = 0; parameter < types.length; parameter++) {
            Annotation[] parameterAnnotations = annotations[parameter];
            if (parameterAnnotations == null) continue;

            for (Annotation annotation: parameterAnnotations) {
                // Annotation is instance of @GetOrder
                if (annotation instanceof GetOrder) {
                    String pathVariable = (GetOrder)annotation.value();

                    // How to read actual path variable value from URI template?
                    // In this example case {orderId} from /testController/order/{orderId}/delete

                    HttpServletRequest request = ((ServletRequestAttributes)RequestContextHolder
                            .currentRequestAttributes()).getRequest();
                    ????? // Now what?

                }
           } // for each annotation
        } // for each parameter
        return jp.proceed();
    }
}

谢谢！