如何在启动spring应用程序之前初始化数据结构？

import org.springframework.beans.factory.InitializingBean;

public class DataInitializer implements InitializingBean {
    @Override
    public void afterPropertiesSet() throws Exception {
        // 初始化数据结构的操作
    }
}

<bean id="dataInitializer" class="com.example.DataInitializer" />

import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;

public class DataInitializer implements ApplicationListener<ContextRefreshedEvent> {
    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
        // 初始化数据结构的操作
    }
}

<bean id="dataInitializer" class="com.example.DataInitializer" />
<bean id="eventListener" class="com.example.EventListener" />
<bean class="org.springframework.context.event.EventListenerProcessor" />

import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;

@Component
public class DataInitializer implements CommandLineRunner {
    @Override
    public void run(String... args) throws Exception {
        // 初始化数据结构的操作
    }
}