maven-bom

26 Nov 2019

maven 有 bom(bills of materials) 功能，bom定义了一套互相兼容的jar包集合。项目只需要依赖bom，即可放心使用依赖的包，无需再指定版本号。 使用dependencyManagement定义bom，创建一个标准的bom项目如下：

<?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>

    <groupId>com.jlcx.qd</groupId>
    <artifactId>inf-bom</artifactId>
    <version>0.0.1</version>
    <packaging>pom</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
        <spring.boot.version>1.5.6.RELEASE</spring.boot.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            
            <dependency>
                <groupId>com.google.guava</groupId>
                <artifactId>guava</artifactId>
                <version>23.0</version>
            </dependency>
            <dependency>
                <groupId>com.google.code.gson</groupId>
                <artifactId>gson</artifactId>
                <version>2.8.5</version>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.14.4</version>
            </dependency>
        </dependencies>
    </dependencyManagement>
    
    <!--  私服配置，用于bom发布  -->
     <distributionManagement>
        <repository>
          <id>maven-releases</id>
          <name>maven-releases</name>
          <url>http://mvn.ydj.com/repository/maven-releases/</url>
        </repository>
        <snapshotRepository>
          <id>maven-snapshots</id>
          <name>maven-snapshots</name>
          <url>http://mvn.ydj.com/repository/maven-snapshots/</url>
        </snapshotRepository>
     </distributionManagement>
</project>

packaging不一定是pom，也可以是jar和war。通常在子项目中引入bom，无需指定版本号。 maven的使用方法，在子项目中通过dependencyManagement引入。

<dependencyManagement>
  <dependencies>
     <dependency>
        <groupId>com.jlcx.qd</groupId>
        <artifactId>inf-bom</artifactId>
        <version>0.0.1</version>
        <type>pom</type>
        <scope>import</scope>
     </dependency>
      
     <dependency>
        ...
     </dependency>
  </dependencies>
</dependencyManagement>

gradle的使用方法：

// import bom
dependencyManagement {
    imports {
        mavenBom 'com.jlcx.qd:inf-bom:0.0.1'
    }
}