Spring AOP：获取切入点注释的参数

发布于 2024-10-21 18:05:52 字数 432 浏览 3 评论 0原文

考虑我已经定义了以下方面：

@Aspect
public class SampleAspect {

    @Around(value="@annotation(sample.SampleAnnotation)")
    public Object display(ProceedingJoinPoint joinPoint) throws Throwable {
        // ...
    }
}

和注释

public @interface SampleAnnotation {
    String value() default "defaultValue";
}

如果我的方面，有没有办法在显示方法中读取注释SampleAnnotation的值参数？

感谢您的帮助，埃里克

原文

Consider I have defined the following aspect:

@Aspect
public class SampleAspect {

    @Around(value="@annotation(sample.SampleAnnotation)")
    public Object display(ProceedingJoinPoint joinPoint) throws Throwable {
        // ...
    }
}

and the annotation

public @interface SampleAnnotation {
    String value() default "defaultValue";
}

Is there a way to read the value parameter of the annotation SampleAnnotation in the display method if my aspect?

Thanks for your help,
erik

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愚人国度 2024-10-28 18:05:52

将建议签名更改为

@Around(value="@annotation(sampleAnnotation)")
public Object display(ProceedingJoinPoint joinPoint, SampleAnnotation sampleAnnotation ) throws Throwable {
    // ...
}

，您将可以访问注释中的值。

请参阅文档了解更多信息。

Change the advice signature to

@Around(value="@annotation(sampleAnnotation)")
public Object display(ProceedingJoinPoint joinPoint, SampleAnnotation sampleAnnotation ) throws Throwable {
    // ...
}

and you will have access to the value in the annotation.

See docs for more info.

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夏雨凉 2024-10-28 18:05:52

下面我将添加一个完整的 AOP 实现示例，其中我将从自定义 pointCut 注释中获取参数，其中我的建议旨在计算函数的执行时间：

1- 自定义注释：

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

    public boolean isActivate() default false;

}

2- 控制器：

@AnnotationLogExecutionTime(isActivate = true)
@PostMapping("/connection")
public HttpEntity<String> createAuthenticationToken(HttpServletRequest request,
                                                        @RequestBody AuthenticationRequest authenticationRequest) {...}

3- 建议

@Component
@Aspect
public class LoggingExecutionTimeAdvice {

    @Around("@annotation(annotationLogExecutionTime)")
    public Object logExecutionTime(ProceedingJoinPoint joinPoint, AnnotationLogExecutionTime annotationLogExecutionTime) throws Throwable {

        if(annotationLogExecutionTime.isActivate()){//Here I recover the value!!!!
            long start = System.currentTimeMillis();
            Object proceed = joinPoint.proceed();
            long executionTime = System.currentTimeMillis() - start;
            System.out.println(joinPoint.getSignature() + " executed in " + executionTime + "ms");
            return proceed;
        }
        Object proceed = joinPoint.proceed();
        return proceed;
    }
}

解释：

我们的建议（logExecutionTime）将在（joinPoint）周围执行，该函数将用AnnotationLogExecutionTime（我们的自定义注释）进行注释，所以我想激活或不激活这个计算时间执行，所以我将从我们的自定义注释的成员中获取值（您询问;））

Bellow I'll add a complete example of AOP implementation where I'll getting parameter from my Custom pointCut annotation, where my advice aim to calculate the time execution of a function:

1- Custom Annotation:

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

    public boolean isActivate() default false;

}

2- Controller:

@AnnotationLogExecutionTime(isActivate = true)
@PostMapping("/connection")
public HttpEntity<String> createAuthenticationToken(HttpServletRequest request,
                                                        @RequestBody AuthenticationRequest authenticationRequest) {...}

3- Advice

@Component
@Aspect
public class LoggingExecutionTimeAdvice {

    @Around("@annotation(annotationLogExecutionTime)")
    public Object logExecutionTime(ProceedingJoinPoint joinPoint, AnnotationLogExecutionTime annotationLogExecutionTime) throws Throwable {

        if(annotationLogExecutionTime.isActivate()){//Here I recover the value!!!!
            long start = System.currentTimeMillis();
            Object proceed = joinPoint.proceed();
            long executionTime = System.currentTimeMillis() - start;
            System.out.println(joinPoint.getSignature() + " executed in " + executionTime + "ms");
            return proceed;
        }
        Object proceed = joinPoint.proceed();
        return proceed;
    }
}

Explanation:

Our advice (logExecutionTime) will be excuted around (joinPoint) the function that will be annotated with AnnotationLogExecutionTime (our custom annotation) so I want to active or not this the calculation of time execution so I'll get the value from the membre of our custom annotation (which you ask about ;) )

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山色无中 2024-10-28 18:05:52

我之前对如何绘制此图感到困惑。

@Before("@annotation(any_variable_name) && args(spring_will_find_its_type_to_match)")
public void myAdvice(JoinPoint joinPoint, MyAnnotation any_variable_name, MyClass spring_will_find_its_type_to_match) {
    System.out.println("before testing in Aspect myAdvice " + spring_will_find_its_type_to_match);
}

I was confused on how to map this before.

@Before("@annotation(any_variable_name) && args(spring_will_find_its_type_to_match)")
public void myAdvice(JoinPoint joinPoint, MyAnnotation any_variable_name, MyClass spring_will_find_its_type_to_match) {
    System.out.println("before testing in Aspect myAdvice " + spring_will_find_its_type_to_match);
}

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