Java寻找具有特定注释的方法及其注释元素

Java寻找具有特定注释的方法及其注释元素

这是一个方法，该方法返回带有特定注释的方法：

public static List<Method> getMethodsAnnotatedWith(final Class<?> type, final Class<? extends Annotation> annotation) {    final List<Method> methods = new ArrayList<Method>();    Class<?> klass = type;    while (klass != Object.class) { // need to iterated thought hierarchy in order to retrieve methods from above the current instance        // iterate though the list of methods declared in the class represented by klass variable, and add those annotated with the specified annotation        for (final Method method : klass.getDeclaredMethods()) { if (method.isAnnotationPresent(annotation)) {     Annotation annotInstance = method.getAnnotation(annotation);     // TODO process annotInstance     methods.add(method); }        }        // move to the upper class in the hierarchy in search for more methods        klass = klass.getSuperclass();    }    return methods;}

可以轻松修改它以满足您的特定需求。请注意，提供的方法会遍历类层次结构，以查找带有所需批注的方法。

这是满足您特定需求的方法：

public static List<Method> getMethodsAnnotatedWithMethodXY(final Class<?> type) {    final List<Method> methods = new ArrayList<Method>();    Class<?> klass = type;    while (klass != Object.class) { // need to iterated thought hierarchy in order to retrieve methods from above the current instance        // iterate though the list of methods declared in the class represented by klass variable, and add those annotated with the specified annotation        for (final Method method : klass.getDeclaredMethods()) { if (method.isAnnotationPresent(MethodXY.class)) {     MethodXY annotInstance = method.getAnnotation(MethodXY.class);     if (annotInstance.x() == 3 && annotInstance.y() == 2) {       methods.add(method);     } }        }        // move to the upper class in the hierarchy in search for more methods        klass = klass.getSuperclass();    }    return methods;}

要调用找到的方法，请参考教程。这里的潜在困难之一是方法参数的数量，这些参数在找到的方法之间可能会有所不同，因此需要进行一些额外的处理。