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@Test
    public void testBeanDefinitionRegistry() {
        //创建一个简单注册器
        BeanDefinitionRegistry register = new DefaultListableBeanFactory();
        //创建bean定义读取器
        BeanDefinitionReader BeanDefinitionReader = new XmlBeanDefinitionReader(register);
        //加载配置文件
        BeanDefinitionReader.loadBeanDefinitions("bean1.xml");
        //所有注册bean
        System.out.println(register.getBeanDefinitionNames().length);
        //从注册器获得bean定义
        BeanDefinition emp = register.getBeanDefinition("emp");//根据beanName
        System.out.println(emp);

        BeanDefinition beanDefinition = new RootBeanDefinition(User.class);
        register.registerBeanDefinition("user",beanDefinition);
        System.out.println(register.getBeanDefinitionNames().length);
        System.out.println(register.getBeanDefinition("user"));
    }