BeanFactory和ApplictionContext

• BeanFactory装载了bean实例，一个容器，提供了对bean的增删改查

• ApplictionContext继承了factory，除此之外还装配了一系列的工厂后置处理器和bean后置处理器

  • BeanFactoryPostProcessor工厂的增强，比如解析@Config，@ComponentScan等注解
  • BeanPostProcessor bean的增强，比如解析@Autowired，@Resource等

bean增强 AutowiredAnnotationBeanPostProcessor

        Field bean3 = Bean1.class.getDeclaredField("bean3");
        //对字段依赖的封装
        DependencyDescriptor dd1 = new DependencyDescriptor(bean3, false);
        Object o = beanFactory.doResolveDependency(dd1, null, null, null);
        System.out.println(o);

        Method setBean2 = Bean1.class.getDeclaredMethod("setBean2", Bean2.class);
        DependencyDescriptor dd2 =
        				//方法中可能会有多个参数
                new DependencyDescriptor(new MethodParameter(setBean2, 0), true);
                //交个bean工厂去解析依赖数据
        Object o1 = beanFactory.doResolveDependency(dd2, null, null, null);
        System.out.println(o1);

工厂增强