1.编辑pom.xml文件下的packaging为war，

<packaging>war</packaging>

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2.移除内嵌tomcat

<exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>

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3.修改启动类，继承SpringBootServletInitializer类, 新增configure方法

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;
import org.springframework.transaction.annotation.EnableTransactionManagement;
@SpringBootApplication
@MapperScan("com.example.mapper")//与dao层的@Mapper二选一写上即可(主要作用是扫包)
public class UserPerson4Application extends SpringBootServletInitializer{ 
    public static void main(String[] args) { 
        SpringApplication.run(UserPerson4Application.class, args);
    }
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) { 
       // 注意这里要指向原先用main方法执行的Application启动类
       return builder.sources(UserPerson4Application.class);
    }
}