访问BeanFactoryPostProcessor中的属性

问题描述

我正在尝试创建一些东西，这些东西将基于可配置的属性(来自 application.yml 等)自动创建bean.

I am trying to create something which will auto-create beans based on configurable properties (from application.yml and the like).

由于我不能像通常在 BeanFactoryPostProcessor 中那样访问属性组件，所以我很困惑如何访问它们.

Since I can't just access the properties component like I normally would in the BeanFactoryPostProcessor, I'm kind of stumped how I can access them.

如何在 BeanFactoryPostProcessor 中访问应用程序属性?

How can I access application properties in BeanFactoryPostProcessor?

推荐答案

如果要在 BeanFactoryPostProcessor 中以类型安全的方式访问属性，则需要从中绑定它们使用 Binder API自己>环境.从本质上讲，这就是Boot本身为支持 @ConfigurationProperties Bean所做的工作.

If you want to access properties in a type-safe manner in a BeanFactoryPostProcessor you'll need to bind them from the Environment yourself using the Binder API. This is essentially what Boot itself does to support @ConfigurationProperties beans.

您的 BeanFactoryPostProcessor 看起来像这样:

@Bean
public static BeanFactoryPostProcessor beanFactoryPostProcessor(
        Environment environment) {
    return new BeanFactoryPostProcessor() {

        @Override
        public void postProcessBeanFactory(
                ConfigurableListableBeanFactory beanFactory) throws BeansException {
            BindResult<ExampleProperties> result = Binder.get(environment)
                    .bind("com.example.prefix", ExampleProperties.class);
            ExampleProperties properties = result.get();
            // Use the properties to post-process the bean factory as needed
        }

    };
}

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