Spring IoC依賴查找類型如下：

1. 根據(jù)Bean名稱（id）查找，在Spring的一個(gè)上下文中誊锭，名稱（id）必須唯一

   • 實(shí)時(shí)查找：馬上查找，馬上所得

   • 延遲查找

     注：spring 應(yīng)用可以有多個(gè)上下文

       BeanFactory beanFactory = new ClassPathXmlApplicationContext("classpath:/dependency/lookupDemo.xml");
       //實(shí)時(shí)查找
       lookUpRealTime(beanFactory);
       //延遲查找
       lookUpLazyTime(beanFactory);
   
        /**
        * spring ioc實(shí)時(shí)查找
        */
       public static void lookUpRealTime(BeanFactory beanFactory) {
           LookupUser lookupUser = (LookupUser) beanFactory.getBean("lookupUser");
           System.out.println(lookupUser.toString());
       }
       
       /**
        *org.springframework.beans.factory.ObjectFactory
        * ObjectFactory,沒有生成新的bean, FactoryBean則會(huì)生成新的bean
        * ObjectFactoryCreatingFactoryBean ** 可以看下實(shí)現(xiàn)甫何，一個(gè)很歡樂的設(shè)計(jì)模式
        *
        */
       public static void lookUpLazyTime(BeanFactory beanFactory) {
   
           ObjectFactory<LookupUser> objectFactory = (ObjectFactory<LookupUser>) beanFactory.getBean("objectFactory");
           LookupUser user = objectFactory.getObject();
           System.out.println("lazy:"+user);
   
       }
   

2. 根據(jù)Bean類型查找

   • 單個(gè)Bean對(duì)象
   • 集合Bean對(duì)象

       BeanFactory beanFactory = new ClassPathXmlApplicationContext("classpath:/dependency/lookupDemo.xml");
       //查找單個(gè)對(duì)象
       lookUpByType(beanFactory);
       //查找集合對(duì)象
       lookupByCollectionType(beanFactory);
       
       
       public static void lookUpByType(BeanFactory beanFactory) {
        LookupUser user = beanFactory.getBean(LookupUser.class);
        System.out.println(user.toString());
       }
   
        /**
        * 復(fù)合類型查找
        */
       private static void lookupByCollectionType(BeanFactory beanFactory) {
           if(beanFactory instanceof ListableBeanFactory){
               ListableBeanFactory listableBeanFactory = (ListableBeanFactory) beanFactory;
               //map穆咐，ke
               Map<String, LookupUser> lookupUserMap = listableBeanFactory.getBeansOfType(LookupUser.class);
               System.out.println(lookupUserMap);
           }
       }
   

3. 根據(jù)Bean名稱+類型查找

4. 根據(jù)Java注解查找

   • 單個(gè)Bean對(duì)象
   • 集合Bean對(duì)象

   //自定義注解
   @Target({ElementType.TYPE})
   @Retention(RetentionPolicy.RUNTIME)
   public @interface Super {
   }
   
    BeanFactory beanFactory = new ClassPathXmlApplicationContext("classpath:/dependency/lookupDemo.xml");
    //根據(jù)注解查找集合類型
    lookupByAnnotationCollection(beanFactory);
    
   private static void lookupByAnnotationCollection(BeanFactory beanFactory) {
       if(beanFactory instanceof ListableBeanFactory){
           ListableBeanFactory listableBeanFactory = (ListableBeanFactory) beanFactory;
           //map，key, 查找符合自定義注解的Bean
           Map<String, Object> lookupUserMap = listableBeanFactory.getBeansWithAnnotation(Super.class);
           System.out.println(lookupUserMap);
       }
   }