ApplicationContextInitializer接口

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