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Maven分类classifier使用

classifier

一、官网描述

https://maven.apache.org/pom.html

The classifier distinguishes artifacts that were built from the same POM but differ in content. It is some optional and arbitrary string that - if present - is appended to the artifact name just after the version number.

As a motivation for this element, consider for example a project that offers an artifact targeting Java 11 but at the same time also an artifact that still supports Java 1.8. The first artifact could be equipped with the classifier jdk11 and the second one with jdk8 such that clients can choose which one to use.

Another common use case for classifiers is to attach secondary artifacts to the project’s main artifact. If you browse the Maven central repository, you will notice that the classifiers sources and javadoc are used to deploy the project source code and API docs along with the packaged class files.

二、使用场景

**用于GAV相同，但内容不同的构件。**例如：

1. 编译等级分类

1）发布方

pom中指定classfier，然后mvn clean install or mvn clean deploy。

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<?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>org.example</groupId>
    <artifactId>maven-test</artifactId>
    <version>1.0-SNAPSHOT</version>
    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <build>
        <plugins>
            <plugin>
                <artifactId>maven-jar-plugin</artifactId>
                <executions>
                    <execution>
                        <id>default-jar</id>
                        <goals>
                            <goal>jar</goal>
                        </goals>
                        <configuration>
                            <classifier>jdk8</classifier>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
    <distributionManagement>
        <snapshotRepository>
            <id>snapshots</id>
            <name>maven2 repository-snapshots</name>
            <url>http://artifactory.xxx.com/libs-snapshots-local</url>
        </snapshotRepository>
    </distributionManagement>
</project>

2）使用方

使用带分类的jar时，需要指定分类。

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<dependency>
    <groupId>org.example</groupId>
    <artifactId>maven-test</artifactId>
    <version>1.0-SNAPSHOT</version>
    <classifier>jdk8</classifier>
</dependency>

3）查看私服的jar包信息

image-20211123195419329

maven-test/1.0-SNAPSHOT/maven-metadata.xml 中，jar包上加了<classifier>jdk8</classifier>限定。

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<?xml version="1.0" encoding="UTF-8"?>
<metadata modelVersion="1.1.0">
  <groupId>org.example</groupId>
  <artifactId>maven-test</artifactId>
  <version>1.0-SNAPSHOT</version>
  <versioning>
    <snapshot>
      <timestamp>20211123.114128</timestamp>
      <buildNumber>1</buildNumber>
    </snapshot>
    <lastUpdated>20211123114129</lastUpdated>
    <snapshotVersions>
      <snapshotVersion>
        <extension>pom</extension>
        <value>1.0-20211123.114128-1</value>
        <updated>20211123114128</updated>
      </snapshotVersion>
      <snapshotVersion>
        <classifier>jdk8</classifier>
        <extension>jar</extension>
        <value>1.0-20211123.114128-1</value>
        <updated>20211123114128</updated>
      </snapshotVersion>
    </snapshotVersions>
  </versioning>
</metadata>

2. 类型分类

文档、源码、Jar

# 参考

  1. https://stackoverflow.com/questions/13061193/maven-generating-two-jar-files-when-used-with-classifier-tag
  2. https://stackoverflow.com/questions/4725668/how-to-deploy-snapshot-with-sources-and-javadoc

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