1. 主程序类：

@SpringBootApplicationpublic class Application extends SpringBootServletInitializer {    @Override
    //www.1b23.com
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {        return application.sources(Application.class);
    }    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

}

2. pom.xml：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.cf</groupId>
  <artifactId>packagea</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  
  <!-- 打包方式 -->
  <packaging>war</packaging>
  
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.9.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        
        <!-- 嵌入式tomcat相关jar将被放入到WEB-INF\lib-provided下 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
    </dependencies>
    
    <build>
        <plugins>
            <!-- 打包插件 -->
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build></project>

3. 使用maven打包(clean package)，此war包可以用于传统的部署方式（外部tomcat），也可以直接使用java -jar 的方式运行。