pom.xml中

war

<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->

<plugins>
    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-surefire-plugin</artifactId>
        <version>2.4.2</version>
        <configuration>
            <skipTests>true</skipTests>
        </configuration>
    </plugin>
</plugins>

添加依赖，打包时检查这两个依赖是否存在，不存在的话添加一下

<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>

<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>

启动类

@EnableTransactionManagement
@ServletComponentScan
@SpringBootApplication
public class SyscloudApplication extends SpringBootServletInitializer {

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

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

}
然后开始打包，修改后由于没有去掉自带的tomcat，所以项目可以正常通过springboot启动

要去掉tomcat时，将pom.xml文件中的web依赖改为：

<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<!-- 移除嵌入式tomcat插件 -->
<exclusions>
    <exclusion>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
    </exclusion>
</exclusions>