如圖所示，項(xiàng)目中定義了這樣幾個(gè)模塊：

• pdd-workflow-build ：定義項(xiàng)目版本，及全局配置
• pdd-workflow-dependencies ：外部依賴管理，統(tǒng)一管理所有用到的外部依賴的版本
• pdd-workflow-service ：項(xiàng)目service模塊
• pdd-workflow-web ：項(xiàng)目web模塊
• pdd-parent ：聚合模塊

模塊之間的繼承依賴關(guān)系如下圖所示：

網(wǎng)上都說用${revision}這樣的占位符，而且必須叫“revision”這個(gè)名字。但是，我自己實(shí)踐過后發(fā)現(xiàn)，這個(gè)變量叫什么都可以（比如：common.version），關(guān)鍵在于要有一個(gè)聚合模塊將所有引用了${revision}的模塊都聚合進(jìn)來，不然打包的時(shí)候還是會找不到版本。

<?xml version="1.0" encoding="UTF-8"?>
<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>
    <parent>
        <groupId>org.example</groupId>
        <artifactId>pdd-workflow-build</artifactId>
        <version>${revision}</version>
        <relativePath>./pdd-workflow-build/pom.xml</relativePath>
    </parent>

    <artifactId>pdd-workflow-parent</artifactId>
    <packaging>pom</packaging>

    <modules>
        <module>pdd-workflow-build</module>
        <module>pdd-workflow-dependencies</module>
        <module>pdd-workflow-service</module>
        <module>pdd-workflow-web</module>
    </modules>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.example</groupId>
                <artifactId>pdd-workflow-dependencies</artifactId>
                <version>${project.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

</project>

眾所周知，<parent>中的版本必須是常量，不能是變量，不然就找不到版本。但是，只要我們增加一個(gè)聚合模塊就可以解決這個(gè)問題，在聚合模塊中引用變量是可以的。所以，叫不叫revision根本無所謂，變量名而已，關(guān)鍵在于<modules>。

<?xml version="1.0" encoding="UTF-8"?>
<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>

    <parent>
        <groupId>org.example</groupId>
        <artifactId>pdd-workflow-build</artifactId>
        <version>${revision}</version>
        <relativePath>../pdd-workflow-build/pom.xml</relativePath>
    </parent>

    <artifactId>pdd-workflow-dependencies</artifactId>
    <packaging>pom</packaging>

    <properties>
        <dubbo.version>3.2.5</dubbo.version>
        <spring-boot.version>3.2.0</spring-boot.version>
        <druid.version>1.2.20</druid.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo</artifactId>
                <version>${dubbo.version}</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>${druid.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

</project>

<?xml version="1.0" encoding="UTF-8"?>
<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>
    <parent>
        <groupId>org.example</groupId>
        <artifactId>pdd-workflow-parent</artifactId>
        <version>${revision}</version>
    </parent>
    <artifactId>pdd-workflow-web</artifactId>
    <packaging>jar</packaging>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>pdd-workflow-service</artifactId>
            <version>${project.version}</version>
        </dependency>
    </dependencies>

</project>

參考Seata，看看Seata是如何統(tǒng)一管理版本的

代碼地址：https://gitee.com/chengjiansheng/pdd-workflow

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