一 创建一个maven项目作为父工程

1、删除src目录
2、修改pom文件，使用spring-boot-dependencies依赖对springboot的依赖包进行统一管理。

<modelVersion>4.0.0</modelVersion>
    <!--基本信息-->
    <groupId>com.jesse</groupId>
    <artifactId>jessecloud</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>jessecloud</name>
    <description> </description>

    <!--定义属性值-->
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring.boot.version>2.5.6</spring.boot.version>
    </properties>

    <!-- 依赖声明 -->
    <dependencyManagement>
        <dependencies>
            <!-- SpringBoot的依赖配置-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring.boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

         <!-- 获取系统信息 -->
        <dependency>
            <groupId>com.github.oshi</groupId>
            <artifactId>oshi-core</artifactId>
            <version>${oshi.version}</version>
        </dependency>

        </dependencies>
    </dependencyManagement>

   <modules>
        <module>framework</module>
        <module>web</module>
    </modules>

    <!--编译管理 jdk版本和字符集编码-->
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                    <encoding>${project.build.sourceEncoding}</encoding>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <!--Maven远程仓库设置 非必要，可以删除-->
    <repositories>
        <repository>
            <id>public</id>
            <name>aliyun nexus</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
            <releases>
                <enabled>true</enabled>
            </releases>
        </repository>
    </repositories>
    <!--Maven远程插件库设置 非必要，可以删除-->
    <pluginRepositories>
        <pluginRepository>
            <id>public</id>
            <name>aliyun nexus</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>

二 创建子工程

1、创建module之后，父工程pom自动添加<modules>关联
2、子工程pom.xml添加以下内容

<modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.jesse</groupId>
        <artifactId>jessecloud</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>web</artifactId>

    <dependencies>
        <!-- SpringBoot Web容器 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
          <!-- 获取系统信息 -->
        <dependency>
            <groupId>com.github.oshi</groupId>
            <artifactId>oshi-core</artifactId>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

父工程的pom就像一个容器，里边放了各种的依赖，哪个子模块需要就在其pom里引用；