springboot让内置tomcat失效

     <dependency>

      <groupId>org.springframework.boot</groupId>

      <artifactId>spring-boot-starter-web</artifactId>

      <!-- 去除内嵌tomcat -->

      <exclusions>

        <exclusion>

          <groupId>org.springframework.boot</groupId>

          <artifactId>spring-boot-starter-tomcat</artifactId>

        </exclusion>

      </exclusions>

    </dependency>

    <!--添加servlet的依赖-->

    <dependency>

      <groupId>javax.servlet</groupId>

      <artifactId>javax.servlet-api</artifactId>

      <version>3.1.0</version>

      <scope>provided</scope>

    </dependency>

      <plugin>

        <artifactId>maven-war-plugin</artifactId>

        <version>3.0.0</version>

      </plugin>

 <packaging>war</packaging>

package com.example.export;

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;

@SpringBootApplication

public class ExportApplication extends SpringBootServletInitializer {

    public static void main(String[] args) {

        SpringApplication.run(ExportApplication.class, args);

    }

    @Override

    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {

        return builder.sources(this.getClass());

    }

}