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接口作用：该接口的实现类会在容器刷新之前执行

public class MyApplicationContextInitalizer1 implements ApplicationContextInitializer
   

启动类

SpringApplication springApplication=new SpringApplication(DemoApplication.class);//MyApplicationContextInitalizer1实现了ApplicationContextInitializer接口springApplication.addInitializers(new MyApplicationContextInitalizer1());springApplication.addInitializers(new MyApplicationContextInitalizer2());springApplication.run();

TODO 测试main方法报错

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