spring 工具类 ReflectionUtils 获取bean所有字段

以前遇到要获取当前类以及所有父类的的field的时候，都是递归一直往上找，一直到Object ，个人觉得这种方法是不是太low了，有没有更好的办法？或者jdk其实是有这种方法的，只是我不知道，今天看了下spring中的实现，也是一样的，真没有更好的办法？

public static void doWithFields(Class<?> clazz, ReflectionUtils.FieldCallback fc, @Nullable ReflectionUtils.FieldFilter ff) {
        Class targetClass = clazz;

        do {
            Field[] fields = getDeclaredFields(targetClass);
            Field[] var5 = fields;
            int var6 = fields.length;

            for(int var7 = 0; var7 < var6; ++var7) {
                Field field = var5[var7];
                if (ff == null || ff.matches(field)) {
                    try {
                        fc.doWith(field);
                    } catch (IllegalAccessException var10) {
                        throw new IllegalStateException("Not allowed to access field '" + field.getName() + "': " + var10);
                    }
                }
            }

            targetClass = targetClass.getSuperclass();
        } while(targetClass != null && targetClass != Object.class);

    }

    private static Field[] getDeclaredFields(Class<?> clazz) {
        Assert.notNull(clazz, "Class must not be null");
        Field[] result = (Field[])declaredFieldsCache.get(clazz);
        if (result == null) {
            try {
                result = clazz.getDeclaredFields();
                declaredFieldsCache.put(clazz, result.length == 0 ? NO_FIELDS : result);
            } catch (Throwable var3) {
                throw new IllegalStateException("Failed to introspect Class [" + clazz.getName() + "] from ClassLoader [" + clazz.getClassLoader() + "]", var3);
            }
        }

        return result;
    }