一、简述
ApplicationContextInitializer是Spring框架原有的概念, 这个类的主要目的就是在 ConfigurableApplicationContext类型（或者子类型）的ApplicationContext做refresh之前，允许我们 对ConfigurableApplicationContext的实例做进一步的设置或者处理。
二、实现该接口
- import org.springframework.context.ApplicationContextInitializer;
- import org.springframework.context.ConfigurableApplicationContext;
-
- public class TestApplicationContextInitializer implements ApplicationContextInitializer {
- @Override
- public void initialize(ConfigurableApplicationContext configurableApplicationContext) {
- // 打印容器里面有多少个bean
- System.out.println("bean count====="+configurableApplicationContext.getBeanDefinitionCount());
- }
- }
三、注册
- @Slf4j
- @EnableScheduling
- @SpringBootApplication
- public class CbdShopApplication{
- public static void main(String[] args) {
- SpringApplication application = new SpringApplication(CbdShopApplication.class);
- application.addInitializers(new TestApplicationContextInitializer());
- application.run(args);
- }
- }
启动项目，看到控制台打印：
bean count=====6
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