springboot使用外置tomcat启动方式

<packaging>war</packaging>

<dependency>  
       <groupId>org.springframework.boot</groupId>  
       <artifactId>spring-boot-starter-WEB</artifactId>  
       <!-- 如果在使用自带tomcat请注释下面，如果使用第三方tomcat不要注释下面 -->  
        <exclusions>    
               <exclusion>    
                   <groupId>org.springframework.boot</groupId>    
                   <artifactId>spring-boot-starter-tomcat</artifactId>    
               </exclusion>    
           </exclusions>   
   </dependency> 

<plugin>  
            <groupId>org.apache.Maven.plugins</groupId>  
            <artifactId>maven-war-plugin</artifactId>  
            <configuration>  
                <warName>springboot</warName>  
            </configuration>  
  </plugin> 

@SpringBootApplication
public class OpenapiApplicationextends SpringBootServletInitializer {
    public static void main(String[] args) {
        SpringApplication.run(OpenApiApplication.class, args);
    }
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(OpenApiApplication.class);
    }
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