@Conditional

条件装配：满足Conditional指定的条件，则进行组件注入

 

 

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

@Configuration//告诉springboot这是一个配置类 public class MyConfig {       @Bean("tom")     public Stu stu01(){         return new Stu("汤姆");     }       @ConditionalOnBean(name="tom")//当容器中有tom组件时，才会对容器注入user01组件     @Bean     public User user01(){         return new User("张三",20);     }   }

　

?

1 2 3 4 5 6 7 8 9 10

@SpringBootApplication public class MainApplication {     public static void main(String[] args) {         //返回IOC容器         ConfigurableApplicationContext run = SpringApplication.run(MainApplication.class, args);           boolean res = run.containsBean("user01");         System.out.println(res);//true     } }