注解部分答案

public static <T> T newInstance(Class<T> clazz) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException {
    var inst = clazz.getConstructor().newInstance();
    var annotations = clazz.getAnnotations();
    var aspects = new LinkedList<IAspect>();
    System.out.println(clazz.getAnnotations().length);
    System.out.println(clazz.getAnnotation(Aspect.class));
    for(var annotation : annotations) {
        if(annotation instanceof Aspect) {
            var type = ((Aspect) annotation).type();
            var aspect= (IAspect)(type.getConstructor().newInstance());
            aspects.push(aspect);
        }
    }

    return (T) Proxy.newProxyInstance(
            clazz.getClassLoader(),
            clazz.getInterfaces(),
            new InvocationHandler() {
                @Override
                public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                    aspects.forEach(aspect -> {
                        aspect.before();
                    });
                    var result = method.invoke(inst);
                    aspects.forEach(aspect -> {
                        aspect.after();
                    });
                    return result;
                }
            }
    );
}