第一步：讓啟動類繼承SpringBootServletInitializer，並重寫configure方法，關鍵程式碼如下

@SpringBootApplication
public class MySpringBootApplication extends SpringBootServletInitializer {
    public static void main(String[] args) {
        SpringApplication.run(MySpringBootApplication.class);

    }
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(this
 
.getClass());
    }
}

第二步：在pom檔案中新增打包方式

<packaging>war</packaging>

第三步：在pom檔案中去除自帶的tomcat

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <!--移除內嵌的tomcat-->
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--servlet的 api-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <scope>provided</scope>
        </dependency>
 

第四步：在pom.xml檔案中的maven外掛中指定打包後的名字finalName

    <build>
        <finalName>demo</finalName>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

注意：打包後的名字要與虛擬路徑一致。如application.properties中配置了server.servlet.context-path=/demo，則finalName中指定為demo.