Spring 动态生成bean

@Configuration
public class DanyConfig implements ApplicationContextAware {

    private static ApplicationContext applicationContext=null;
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext=applicationContext;
    }


    public  static ApplicationContext getApplicationContext(){
        return applicationContext;
    }
}

@RunWith(SpringRunner.class)
@SpringBootTest
public class DanyTest {



    @Test
    public void test(){
        ConfigurableApplicationContext context = (ConfigurableApplicationContext)  DanyConfig.getApplicationContext();
        //Bean的实例工厂
        DefaultListableBeanFactory dbf = (DefaultListableBeanFactory) context.getBeanFactory();
        //Bean构建  BeanService.class 要创建的Bean的Class对象
        BeanDefinitionBuilder dataSourceBuider = BeanDefinitionBuilder. genericBeanDefinition(BeanService.class);
        //向里面的属性注入值，提供get set方法
        dataSourceBuider.addPropertyValue("msg", "hello ");
        //dataSourceBuider.setParentName("");  同配置 parent
        //dataSourceBuider.setScope("");   同配置 scope
        //将实例注册spring容器中   bs 等同于  id配置
        dbf.registerBeanDefinition("beanService", dataSourceBuider.getBeanDefinition());

        BeanService beanService=(BeanService) context.getBean("beanService");
        beanService.say();
        
    }


}


class BeanService  {
    private String msg;
    public String getMsg() {
        return msg;
    }
    public void setMsg(String msg) {
        this.msg = msg;
    }
    public void say(){
        System.out.println("====="+msg);
    }

}