Maven多模块项目版本统一管理
https://img2023.cnblogs.com/blog/874963/202312/874963-20231206151935145-496010476.png如图所示，项目中定义了这样几个模块：
[*]pdd-workflow-build ：定义项目版本，及全局配置
[*]pdd-workflow-dependencies ：外部依赖管理，统一管理所有用到的外部依赖的版本
[*]pdd-workflow-service ：项目service模块
[*]pdd-workflow-web ：项目web模块
[*]pdd-parent ：聚合模块
模块之间的继承依赖关系如下图所示：
https://img2023.cnblogs.com/blog/874963/202312/874963-20231206152409332-107773031.png
网上都说用${revision}这样的占位符，而且必须叫“revision”这个名字。但是，我自己实践过后发现，这个变量叫什么都可以（比如：common.version），关键在于要有一个聚合模块将所有引用了${revision}的模块都聚合进来，不然打包的时候还是会找不到版本。
<?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>众所周知，中的版本必须是常量，不能是变量，不然就找不到版本。但是，只要我们增加一个聚合模块就可以解决这个问题，在聚合模块中引用变量是可以的。所以，叫不叫revision根本无所谓，变量名而已，关键在于。
<?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>https://img2023.cnblogs.com/blog/874963/202312/874963-20231206153302127-1208611144.png
参考Seata，看看Seata是如何统一管理版本的
https://img2023.cnblogs.com/blog/874963/202312/874963-20231206154031912-1181719544.png
https://img2023.cnblogs.com/blog/874963/202312/874963-20231206154039751-1098732954.png
代码地址：https://gitee.com/chengjiansheng/pdd-workflow
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