哪位大神能讲解一下SpringApplicationBuilder的作用吗?

公司项目里这样搭建项目,有哪位大神能讲解一下吗?

启动类

public class FoilbillplatformServiceRedisApplication {

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

不明白的类:(请问这样配置的作用是什么呢?)

public class ServletInitializer extends SpringBootServletInitializer {

	@Override
	protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
		return application.sources(FoilbillplatformServiceRedisApplication.class);
	}

}