根据Bean名称查找

初始化

BeanFactory beanFactory = new ClassPathXmlApplicationContext("classpath:/META-INF/dependency-lookup-context.xml");

• 实时查找

  private static void lookupInRealTime(BeanFactory beanFactory) {
          User user = (User) beanFactory.getBean("user");
          System.out.println("实时查找：" + user);
      }
  

• 延迟查找

  private static void lookupInLazy(BeanFactory beanFactory) {
      ObjectFactory<User> objectFactory = (ObjectFactory<User>) beanFactory.getBean("objectFactory");
      User user = objectFactory.getObject();
      System.out.println("延迟查找：" + user);
  }
  

根据Bean类型查找

• 单个Bean对象

   private static void lookupByType(BeanFactory beanFactory) {
          User user = beanFactory.getBean(User.class);
          System.out.println("实时查找：" + user);
      }
  

• 集合Bean对象

     private static void lookupCollectionByType(BeanFactory beanFactory) {
          if (beanFactory instanceof ListableBeanFactory) {
              ListableBeanFactory listableBeanFactory = (ListableBeanFactory) beanFactory;
              Map<String, User> users = listableBeanFactory.getBeansOfType(User.class);
              System.out.println("查找到的所有的 User 集合对象：" + users);
          }
      }
  

根据Bean名称+类型查找

根据Java注解查找

• 单个Bean对象

  private static void lookupByAnnotationType(BeanFactory beanFactory) {
    if (beanFactory instanceof ListableBeanFactory) {
      ListableBeanFactory listableBeanFactory = (ListableBeanFactory) beanFactory;
      Map<String, User> users = (Map) listableBeanFactory.getBeansWithAnnotation(Super.class);
      System.out.println("查找标注 @Super 所有的 User 集合对象：" + users);
    }
  }
  

• 集合Bean对象