Spring注解系列八：组件注册-ImportSelector

转：https://blog.csdn.net/lizhiqiang1217/article/details/89949542

1、MainConfig2

@Configuration
//ImportSelector:返回需要导入的组件的全类名数组；
@Import(MyImportSelector.class)
public class MainConfig2 {

}

2、自定义需要导入的组件MyImportSelector 。实现ImportSelector 接口

//自定义逻辑返回需要导入的组件
public class MyImportSelector implements ImportSelector {

    //返回值，就是到导入到容器中的组件全类名
    //AnnotationMetadata:当前标注@Import注解的类的所有注解信息
    @Override
    public String[] selectImports(AnnotationMetadata importingClassMetadata) {
        // TODO Auto-generated method stub
        //方法不要返回null值
        return new String[]{"com.atguigu.bean.Color","com.atguigu.bean.Red"};
    }
}

3、测试

@Test
public void testImportSelector(){
    AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainConfig2.class);
    String[] definitionNames = applicationContext.getBeanDefinitionNames();
    for (String name : definitionNames) {
        System.out.println(name);
    }
}