Spring Boot 实例化bean如何选择代理方式？

图1
我们再回顾一下之前的事务源码分析有提到，执行到AbstractAutowireCapableBeanFactory.initializeBean()->applyBeanPostProcessorsAfterInitialization(wrappedBean, beanName)->AbstractAutoProxyCreator.postProcessAfterInitialization()->AbstractAutoProxyCreator.wrapIfNecessary()->DefaultAopProxyFactory.createAopProxy()链条创建代理；

public AopProxy createAopProxy(AdvisedSupport config) throws AopConfigException {
        if (config.isOptimize() || config.isProxyTargetClass() || hasNoUserSuppliedProxyInterfaces(config)) {
            Class<?> targetClass = config.getTargetClass();
            if (targetClass == null) {
                throw new AopConfigException("TargetSource cannot determine target class: " +
                        "Either an interface or a target is required for proxy creation.");
            }
            //如果是接口
            if (targetClass.isInterface() || Proxy.isProxyClass(targetClass)) {
                return new JdkDynamicAopProxy(config);
            }
            //如果不是接口
            return new ObjenesisCglibAopProxy(config);
        }
        else {
            return new JdkDynamicAopProxy(config);
        }
    }

通过上面的方式判断cglib还是jdk动态代理；