import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Hello {

    public static void main(String[] args) {
        ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml");
        String username = System.getenv("USERNAME");
        System.out.println(username);
        Hello hello = ac.getBean(Hello.class);
        System.out.println(hello);
        String a = ac.getEnvironment().getProperty("a");
        System.out.println(a);
    }
}


class MyBeanFactoryPostProcess implements BeanFactoryPostProcessor{
    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        BeanDefinition hello = beanFactory.getBeanDefinition("Hello");
//        hello.set
        System.out.println(12);
    }
}