Mavens依赖声明分类器属性的目的是什么？ [英] What is the purpose of Mavens dependency declarations classifier property?

问题描述

我有一个pom.xml文件，因为我看到他们的3个依赖项引用了相同的< artifactId> 差异在于标签

I have a pom.xml file and in that i see that their are 3 dependencies referenced for same <artifactId> the difference are in tags

<classifier>sources</classifier>
<classifier>javadoc</classifier>

我删除了具有 SOURCES / JAVADOC 并且只保留一个依赖项。我测试了我的应用程序，每件事情都很好。

I have deleted the dependencies that had the SOURCES/JAVADOCand only kept one dependency. I tested my application and every thing work fine.

使用此分类器标签的目的是什么？以及为什么我需要两次复制依赖项，以便使用 SOURCES / JAVADOC 添加< classifier> 标记。

What is the purpose of using this classifier tag? and why i need to duplicate dependencies twice for adding <classifier> tag with SOURCES/JAVADOC .

<dependency>
   <groupId>oauth.signpost</groupId>
   <artifactId>signpost-commonshttp4</artifactId>
   <version>1.2.1.2</version>
   <type>jar</type>
   <scope>compile</scope>
</dependency>
  <dependency>
   <groupId>oauth.signpost</groupId>
   <artifactId>signpost-commonshttp4</artifactId>
   <version>1.2.1.2</version>
   <type>jar</type>
      ***<classifier>javadoc</classifier>***
   <scope>compile</scope>
</dependency>
<dependency>
   <groupId>oauth.signpost</groupId>
   <artifactId>signpost-commonshttp4</artifactId>
   <version>1.2.1.2</version>
   <type>jar</type>
   ***<classifier>sources</classifier>***
   <scope>compile</scope>
</dependency> 

推荐答案

分类器允许区分从中构建的工件相同的POM但内容不同。它是一些可选的任意字符串 - 如果存在 - 将在版本号之后附加到工件名称。

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

以获取详细信息检查http://maven.apache.org/pom.html

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