如何在Spring方面访问自定义注释值 [英] how to access custom annotation values in spring aspect

问题描述

我正在尝试从jointCut访问自定义注释值.但是我找不到办法.

I am trying to access the custom annotation values from jointCut. But I couldn't find a way.

我的示例代码:

@ComponentValidation(input1="input1", typeOfRule="validation", logger=Log.EXCEPTION)
public boolean validator(Map<String,String> mapStr) {
    //blah blah
}

尝试访问 @Aspect 类.

但是，我没有看到任何访问值的范围.

But, i didnt see any scope to access values.

我尝试访问的方式在代码下方

Way i am trying to access is below code

CodeSignature codeSignature = (CodeSignature) joinPoint.getSignature(); 
String[] names = codeSignature.getParameterNames();
MethodSignature methodSignature = (MethodSignature) joinPoint.getStaticPart().getSignature();
Annotation[][] annotations = methodSignature.getMethod().getParameterAnnotations();
Object[] values = joinPoint.getArgs();

我没有看到任何值返回input = input1.如何实现这一目标.

i didnt see any value returns input = input1. how to achieve this.

推荐答案

从纯Java的角度来看， Jama Asatillayev 的答案是正确的，但它涉及反思.

While the answer by Jama Asatillayev is correct from a plain Java perspective, it involves reflection.

但是问题特别是关于Spring AOP或AspectJ，并且有一种更简单，更规范的方法，可以使用AspectJ语法将匹配的注释绑定到方面建议参数，而无需任何反思，BTW.

But the question was specifically about Spring AOP or AspectJ, and there is a much simpler and more canonical way to bind matched annotations to aspect advice parameters with AspectJ syntax - without any reflection, BTW.

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;

import my.package.ComponentValidation;

@Aspect
public class MyAspect {
    @Before("@annotation(validation)")
    public void myAdvice(JoinPoint thisJoinPoint, ComponentValidation validation) {
        System.out.println(thisJoinPoint + " -> " + validation);
    }
}

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