修改启动类

改成继承org.springframework.boot.web.servlet.support.SpringBootServletInitializer, 例如：

package cn.devmgr.tutorial;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;

@SpringBootApplication
public class Application extends SpringBootServletInitializer{

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

修改pom文件

改packaging方式为war

    <packaging>war</packaging>

改依赖

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-rest</artifactId>
            <!-- 排除掉内嵌的tomcat，为了减少war体积，也为了避免和tomcat服务器冲突 -->
        <exclusions>
            <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-tomcat</artifactId>
            </exclusion>
        </exclusions>
    </dependency>

    <!-- 去掉了内嵌的tomcat后，需要增加servlet-api，否则编译会出错了 -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <scope>provided</scope>
    </dependency>

注意事项

spring boot 2.0项目需要在tomcat 8.5以上版本环境下运行