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BeanFactory和ApplicationContext的区别

程序员文章站 2022-03-03 12:37:24
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<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">
  <!--  xml文件配置 -->
    <bean id = "userDao" class="com.itheima.dao.Impl.UserDaoImpl"></bean>

    <bean id = "userService" class="com.itheima.service.Impl.UserServiceImpl"></bean>

</beans>

  @org.junit.Test
    public void comparefa(){
        ClassPathResource resource = new ClassPathResource("beans.xml");

        //beanFactory:创建容器对象时只是加载配置文件,没有创建对象,即使路径错误也不会报错,只有运行的时候才会报错
        //获取对象时创建对象
        XmlBeanFactory beanFactory = new XmlBeanFactory(resource);
        Object userDao = beanFactory.getBean("userDao");
        System.out.println(userDao);


        //ApplicationContext:在创建容器对象时创建对象  (常用)
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
        Object userDao1 = applicationContext.getBean("userDao");
        System.out.println(userDao1);
    }
相关标签: spring基础