Maven插件别名如何映射 [英] How are maven plugin aliases mapped

问题描述

我正在尝试了解mvn clean:clean的实际作用.

I am trying to understand what mvn clean:clean actually does.

mvn -B help:describe -Dcmd=clean
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building sample-one 1.0.0
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-help-plugin:2.2:describe (default-cli) @ sample-one ---
[INFO] 'clean' is a lifecycle with the following phases:
* pre-clean: Not defined
* clean: org.apache.maven.plugins:maven-clean-plugin:2.5:clean
* post-clean: Not defined

[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.689 s
[INFO] Finished at: 2015-12-10T10:20:16-08:00
[INFO] Final Memory: 9M/245M
[INFO] ------------------------------------------------------------------------

在我看来，mvn clean:clean与执行mvn org.apache.maven.plugins:maven-clean-plugin:2.5:clean相同.因此，我假设mvn clean:clean中的第一个clean只是org.apache.maven.plugins:maven-clean-plugin:2.5的别名.类似地，mvn maven-surefire-plugin:2.12.4:test与mvn surefire:test相同.

It appears to me that mvn clean:clean is same as doing mvn org.apache.maven.plugins:maven-clean-plugin:2.5:clean. Therefore I am assuming the first clean in mvn clean:clean is just an alias for org.apache.maven.plugins:maven-clean-plugin:2.5. Similarly mvn maven-surefire-plugin:2.12.4:test is same as mvn surefire:test.

所以以某种方式，maven-surefire-plugin:2.12.4似乎是指surefire，而org.apache.maven.plugins:maven-clean-plugin:2.5是指clean.

So somehow, maven-surefire-plugin:2.12.4 seems to refer to surefire and org.apache.maven.plugins:maven-clean-plugin:2.5 to clean.

当我看有效的pom时，我看到以下内容 maven-surefire-插件 2.12.4 默认测试 测试 测试 maven-clean-plugin 2.5 默认清理 干净的 干净的

When I look at the effective-pom, I see the following maven-surefire-plugin 2.12.4 default-test test test maven-clean-plugin 2.5 default-clean clean clean

如您所见，pom似乎没有定义别名.所以下面是我的问题

As you can see, the pom doesnt seem to define alias. So following are my questions

1. 我对插件别名的理解正确吗
2. 如果我对别名的理解是正确的-a)如何以及在何处定义它们? b)有没有办法列出所有别名.

推荐答案

摘自有关

缩短命令行
有几种方法可以减少所需的键入量:

Shortening the Command Line
There are several ways to reduce the amount of required typing:

• 如果需要运行本地存储库中安装的插件的最新版本，则可以省略其版本号.因此，只需使用mvn sample.plugin:hello-maven-plugin:sayhi运行您的插件即可.
• 您可以为插件分配一个缩短的前缀，例如mvn hello:sayhi.如果遵循使用${prefix}-maven-plugin的约定(或者如果插件是Apache Maven项目的一部分，则使用maven-${prefix}-plugin)，则将自动完成此操作.您也可以通过其他配置分配一个-有关更多信息，请参见插件前缀映射简介.

• 最后，您还可以将插件的groupId添加到默认搜索的groupId列表中.为此，您需要将以下内容添加到您的${user.home}/.m2/settings.xml文件中:

• If you need to run the latest version of a plugin installed in your local repository, you can omit its version number. So just use mvn sample.plugin:hello-maven-plugin:sayhi to run your plugin.
• You can assign a shortened prefix to your plugin, such as mvn hello:sayhi. This is done automatically if you follow the convention of using ${prefix}-maven-plugin (or maven-${prefix}-plugin if the plugin is part of the Apache Maven project). You may also assign one through additional configuration - for more information see Introduction to Plugin Prefix Mapping.

• Finally, you can also add your plugin's groupId to the list of groupIds searched by default. To do this, you need to add the following to your ${user.home}/.m2/settings.xml file:

<pluginGroups> <pluginGroup>sample.plugin</pluginGroup>
</pluginGroups>

<pluginGroups> <pluginGroup>sample.plugin</pluginGroup>
</pluginGroups>

此时，您可以使用mvn hello:sayhi运行mojo.

At this point, you can run the mojo with mvn hello:sayhi.

因此，别名未在pom文件中定义，而是maven内置机制的一部分.官方文档中还提供了有关插件前缀解析的更多详细信息. .

So, alias are not defined in the pom file but part of built-in mechanism of maven. Further details are also provided in the official documentation about Plugin Prefix Resolution.

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