final class JdkDynamicAopProxy implements AopProxy, InvocationHandler, Serializable {

    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        ...
　　　　　　　//获取拦截器链　　
            List<Object> chain = this.advised.getInterceptorsAndDynamicInterceptionAdvice(method, targetClass);
            // Check whether we have any advice. If we don‘t, we can fallback on direct
            if (chain.isEmpty()) {
                // 如果拦截器链为空，则执行目标方法
                retVal = AopUtils.invokeJoinpointUsingReflection(target, method, args);
            }
            else {
                // 封装拦截器链的执行方法
                invocation = new ReflectiveMethodInvocation(proxy, target, method, args, targetClass, chain);
                // 拦截器链执行
                retVal = invocation.proceed();
            }
　　　　　...
}