package com.muyu.bms;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@SpringBootApplication
@EnableTransactionManagement
public class BookManagementSystemApplication extends SpringBootServletInitializer {

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

   @Override
   protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
   	return builder.sources(BookManagementSystemApplication.class);
   }
}

SpringBootServletInitializer类是一个实现了WebApplicationInitializer接口的类。
他的作用相当于web.xml，这个类的作用是专门面对war包的，如图