在運行時使用反射覆蓋方法級別 @annotation，適用於類級別

Question

問題：我能夠使用以下方法成功覆蓋類級別的注釋：

public static void alterClassAnnotation(Class classToLookFor, Class<? extends Annotation> annotationToAlter,Annotation annotationValue) {
        if (isJDK7OrLower()) {
            try {
                Field annotations = Class.class.getDeclaredField(ANNOTATIONS);
                annotations.setAccessible(true);
                Map<Class<? extends Annotation>, Annotation> map =
                    (Map<Class<? extends Annotation>, Annotation>) annotations.get(classToLookFor);
                map.put(annotationToAlter, annotationValue);
            } catch (Exception  e) {
                e.printStackTrace();
            }
        } else {
            try {
                //In JDK8 Class has a private method called annotationData().
                //We first need to invoke it to obtain a reference to AnnotationData class which is a private class
                Method method = Class.class.getDeclaredMethod(ANNOTATION_DATA, null);
                method.setAccessible(true);
                //Since AnnotationData is a private class we cannot create a direct reference to it. We will have to
                //manage with just Object
                Object annotationData = method.invoke(classToLookFor);
                //We now look for the map called "annotations" within AnnotationData object.
                Field annotations = annotationData.getClass().getDeclaredField(ANNOTATIONS);
                annotations.setAccessible(true);
                Map<Class<? extends Annotation>, Annotation> map =
                    (Map<Class<? extends Annotation>, Annotation>) annotations.get(annotationData);
                map.put(annotationToAlter, annotationValue);
            } catch (Exception  e) {
                e.printStackTrace();
            }
        }
    }

我對反射 API 感到困惑，如何修改此代碼以覆蓋方法級別參數的值？ 我有 3 個注釋，其中 2 個可以在類級別設置，所以我用這段代碼成功地覆蓋了它們，但是如果注釋是針對方法本身的呢？

我的接口實現類：

import java.lang.annotation.Annotation;

import io.qameta.allure.junit4.DisplayName;
public class DynamicDisplayName implements DisplayName {

    private String value;

    public DynamicDisplayName(String value) {
        this.value = value;
    }

    @Override
    public Class<? extends Annotation> annotationType() {
        return null;
    }

    @Override
    public String value() {
        return value;
    }

}

我已經成功地覆蓋了 Issue 和 TmsLink，這是我的代碼（這兩個接口都在類級別正常運行）

Issue issue = SaveCourse.class.getAnnotation(Issue.class);
DynamicIssue altered = new DynamicIssue(issueId);
AnnotationHelper.alterClassAnnotation(SaveCourse.class, Issue.class, altered);
issue = SaveCourse.class.getAnnotation(Issue.class);                 


DisplayName dname = SaveCourse.class.getAnnotation(DisplayName.class);
DynamicDisplayName dna = new DynamicDisplayName(displayName);
AnnotationHelper.alterClassAnnotation(SaveCourse.class, DisplayName.class, dna);
dname = SaveCourse.class.getAnnotation(DisplayName.class);

TmsLink tmslink = SaveCourse.class.getAnnotation(TmsLink.class);
DynamicTmsLink tmsaltered = new DynamicTmsLink(testCaseId);
AnnotationHelper.alterClassAnnotation(SaveCourse.class, TmsLink.class, tmsaltered);
tmslink = SaveCourse.class.getAnnotation(TmsLink.class);

displayName 接口：

/**
 * Used to change display name for test in the report.
 */
@Documented
@Inherited
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.TYPE})
public @interface DisplayName {

    String value();

}

Answer 1

這是我在github上的代碼。 . 你可以使用

addAnnotation(...)
removeAnnotation(...)
changeAnnotationValue(...)

修改Class 、 Field 、 Method上的注解。 並使用createAnnotationFromMap創建任何類型注釋。

Answer 2

對於 JUnit4 引誘，我使用以下方法在方法級別動態設置 DisplayName。

AllureLifecycle oLifecycle = Allure.getLifecycle();
oLifecycle.updateTestCase(testResult -> testResult.setName("My DisplayName");