Spring MVC:切入点中的正式绑定 [英] Spring MVC: formal unbound in pointcut

问题描述

我的Spring Web模型-视图-控制器(MVC)框架中有此类.我正在使用面向方面的编程(AOP)，这是一种编程范例，旨在通过允许跨领域关注点的分离来提高模块化. 这个课程一切都很好

I have this class in my Spring Web model-view-controller (MVC) framework. I am using aspect-oriented programming (AOP), a programming paradigm that aims to increase modularity by allowing the separation of cross-cutting concerns. Everything is fine with this class

@Aspect
public class MarketingAspect extends ServiceSupport {

    @Pointcut("execution(* com.tdk.iot.services.client.LicenseService.*(..))")
    public void handleServiceMethod() {
    }

    @Pointcut("execution(* com.tdk.iot.services.client.ApplicantService.*(..))")
    public void handleApplicantServiceMethod() {
    }


    @Before("com.tdk.iot.services.aop.ApplicantAspect.handleServiceMethod()")
    public void before(JoinPoint _jp) {
        User user = getLDAPUser();
        if(user != null &&( (user.getUserRole() != UserRole.MARKETING)) {
            throw new NoSufficientRoleException(user == null ? null : user.getUserRole(), UserRole.MARKETING);
        }
    }


    @Before("com.tdk.iot.services.aop.ApplicantAspect.handleApplicantServiceMethod()")
    public void checkRolebefore(JoinPoint _jp) {
        User user = getLDAPUser();
        if(user != null &&( (user.getUserRole() != UserRole.MARKETING))) {
            throw new NoSufficientRoleException(user == null ? null : user.getUserRole(), UserRole.MARKETING);
        }
    }   
}

我更改了方法表示法getLDAPUser，现在接收HttpServletRequest请求作为参数，因此我将方法修改为

I have changed the method notation getLDAPUser and now receives HttpServletRequest request as a parameter, so I modified the method as

@Before("com.tdk.iot.services.aop.ApplicantAspect.handleApplicantServiceMethod()")
public void checkRolebefore(JoinPoint _jp, HttpServletRequest request) {
    User user = getLDAPUser(request);
    if(user != null &&( (user.getUserRole() != UserRole.MARKETING))) {
        throw new NoSufficientRoleException(user == null ? null : user.getUserRole(), UserRole.MARKETING);
    }
}   

修改此方法后，出现此错误

and after modified this method I got this ERROR

java.lang.IllegalArgumentException: error at ::0 formal unbound in pointcut 

在我的XML中:

<!-- Scan for aspects -->
    <aop:aspectj-autoproxy />       
    <bean id="marketingAspect" class="com.tdk.iot.services.aop.MarketingAspect" />

推荐答案

首先，AspectJ基础知识:错误formal unbound in pointcut仅仅意味着您的建议声明了相应切入点未使用(绑定)的参数(反之亦然).您可以通过args()，this()，target()，@annotation()等将参数绑定到建议方法参数.

First the AspectJ basics: The error formal unbound in pointcut simply means that your advice declares a parameter not used (bound) by the corresponding pointcut (or vice versa). You can bind parameters to advice method parameters via args(), this(), target(), @annotation() etc.

具体问题是在您的建议中声明了参数HttpServletRequest request.价值从何而来?相应的切入点似乎拦截了另一个方面的建议方法，该方法没有任何类型为HttpServletRequest的参数.因此，只要您没有源即可使用servlet请求，就必须自己创建一个实例.

The concrete problem is that in your advice you declare the parameter HttpServletRequest request. Where should the value come from? The corresponding pointcut seems to intercept another aspect's advice method which does not have any parameter of type HttpServletRequest. So as long as you do not have a source you can tap for the servlet request, you will have to create an instance by yourself.

我的印象是，您需要首先了解有关AOP的更多信息.随时发布更多代码并解释您要从何处获取对象，然后我可能会帮助您修复代码.

My impression is you need to learn a bit more about AOP first. Feel free to post more code and explain where you want to get the object from, then I can probably help you fix your code.

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