实际应用中，希望项目启动的时候就去做一些事情，比如数据加载。springboot提供了实现这一需求，通过实现接口CommandLineRunner来实现

import org.springframework.boot.CommandLineRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

@Component
public class Command implements CommandLineRunner{
    @Override
    public void run(String...args) throws Exception{
        System.out.println("启动后执行");
    }
}

指定顺序执行，@Order注解

Demo1

import org.springframework.boot.CommandLineRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

@Component
@Order(value=1)
public class Command implements CommandLineRunner{
    @Override
    public void run(String...args) throws Exception{
        System.out.println("启动后执行");
    }
}

Demo2

import org.springframework.boot.CommandLineRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
@Component
@Order(value=2)
public class CommandNext implements CommandLineRunner{
    @Override
    public void run(String...args) throws Exception{
        System.out.println("next执行");
    }
}

执行顺序：

Paste_Image.png