springboot启动main springboot项目main函数启动的操作

package controller;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;
@SpringBootApplication
public class appController extends SpringBootServletInitializer {
    public static void main(String[] args){
        SpringApplication.run(appController.class,args);
    }
    
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(appController.class);
    }
}

 
@SpringBootApplication
public class UdeamApplication { 
    public static void main(String[] args) {
        SpringApplication.run(UdeamApplication.class, args);
    }
}