需求：校验入口方法上的参数。

思路：AOP 的方法拦截器搜索入口方法上 Validator(接口) 类型的参数。拿到这些 Validator 接口的实现后进行校验。
接口定义：

public interface Validator {
    /**
     * 校验多个参数
     * @param values 多个待被校验的值
     * @throws ValidateException
     */
    void validate(Object... values) throws ValidateException;
}

public class ValidateException extends Exception {
    public ValidateException(String msg) {
        super(msg);
    }
}

public class ValidateException extends Exception {
    public ValidateException(String msg) {
        super(msg);
    }
}

拦截器的实现：

@IocBean
final public class ValidationInterceptor implements MethodInterceptor {
    public void filter(InterceptorChain chain) throws Throwable {
        Object[] args = chain.getArgs();

        //没有 Validator 接口的实现者
        List<Object> validators = Stream.of(args)
                                    .filter(arg -> Validator.class.isAssignableFrom(arg.getClass()))
                                    .collect(Collectors.toList());


        if (validators.isEmpty()) {
            chain.doChain();
            return;
        }

        List<Object> toBeValids = Stream.of(args)
                                    .filter(arg -> !Validator.class.isAssignableFrom(arg.getClass()))
                                    .collect(Collectors.toList());


        if (!toBeValids.isEmpty()) {

            for (Object va : validators) {

                if (va instanceof Validator)
                    ((Validator) va).validate(toBeValids.toArray());

            }

        }

        chain.doChain();
    }
}

控制器上使用AOP拦截器进行校验：

@At(value = "/clockonoff", methods = {"POST", "PUT"})
    @Filters( @By(type= AuthorzationAdminFilter.class, args = {"ioc:authorzationAdminFilter"}) )
    @AdaptBy(type=JsonAdaptor.class)
    @Aop("validationInterceptor")
    public int updateClockOnOffConfig(
        @Param("on") Time onTime,
        @Param("off") Time offTime,
        @Inject("clockOnOffValidator") ClockOnOffValidator validator) {

        return sysService.updateClockOnOffConfig(onTime, offTime);
    }

其中， ClockOnOffValidator 类型是实现了Validator