一、首先在父工程中引入springcloud

	<dependencyManagement>
        <dependencies>
            <dependency>
                <!-- Import dependency management from Spring Boot -->
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.7.3</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>2021.0.4</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

设置jdk编译的版本

	<build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.4</version>
                <configuration>
                    <!--编译版本-->
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>utf-8</encoding>
                </configuration>
            </plugin>
        </plugins>
    </build>

二、子工程中引入spring-boot-web

	<properties>
        <spring.boot-version>2.3.12.RELEASE</spring.boot-version>
    </properties>
    <dependencies>
         <!--注意：由于 spring-boot-starter-web 默认替我们引入了核心启动器 spring-boot-starter，
        因此，当 Spring Boot  项目中的 pom.xml 引入了 spring-boot-starter-web 的依赖后，
        就无须在引入 spring-boot-starter 核心启动器的依赖了-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

三、编写启动类

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

注意：springcloud和springboot的版本对应