通过FactoryBean向Spring容器注册组件

1. 编写工厂bean（实现FactoryBean接口）

   public class Person {
   }
   
   
   public class PersonFactoryBean implements FactoryBean<Person> {
   
       @Override
       public Person getObject() throws Exception {
           return new Person();
       }
   
       @Override
       public Class<?> getObjectType() {
           return Person.class;
       }
   
       @Override
       public boolean isSingleton() {
           return true;
       }
   }
   

2. 配置类MainConfig.java

   @Configuration
   public class MainConfig {
   
       @Bean
       public PersonFactoryBean personFactoryBean() {
           return new PersonFactoryBean();
       }
   
   }
   

3. 编写测试类，控制台打印结果

   public class MainTest {
   
       public static void main(String[] args) {
   
           AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainConfig.class);
           //获取person对象
           Class<?> bean = applicationContext.getBean("personFactoryBean").getClass();
           System.out.println("bean的类型："+bean);
           //获取personFactoryBean对象，前缀'&'
           Class<?> bean2 = applicationContext.getBean("&personFactoryBean").getClass();
           System.out.println("bean2的类型："+bean2);
       }
   
   }
   

   

代码地址