【Maven实战技巧】「配置文件专题」史上最全面的Maven-Setting文件的配置拆解说明指南！

<?xml version="1.0" encoding="UTF-8"?> 
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<!--
 | This is the configuration file for Maven. It can be specified at two levels:
 |
 |  1. User Level. This settings.xml file provides configuration for a single user, 
 |                 and is normally provided in ${user.home}/.m2/settings.xml.
 |
 |                 NOTE: This location can be overridden with the CLI option:
 |
 |                 -s /path/to/user/settings.xml
 |
 |  2. Global Level. This settings.xml file provides configuration for all Maven
 |                 users on a machine (assuming they're all using the same Maven
 |                 installation). It's normally provided in 
 |                 ${maven.home}/conf/settings.xml.
 |
 |                 NOTE: This location can be overridden with the CLI option:
 |
 |                 -gs /path/to/global/settings.xml
 |
 | The sections in this sample file are intended to give you a running start at
 | getting the most out of your Maven installation. Where appropriate, the default
 | values (values used when the setting is not specified) are provided.
 |
 |-->
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<settings 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/settings-1.0.0.xsd">  
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<!-- localRepository
   | The path to the local repository maven will use to store artifacts.
   |
   | Default: ${user.home}/.m2/repository
  -->
<localRepository>usr/local/maven</localRepository>  
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<interactiveMode>true</interactiveMode>  
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<usePluginRegistry>false</usePluginRegistry>  
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<!-- offline
  | Determines whether maven should attempt to connect to the network when executing a build.
  | This will have an effect on artifact downloads, artifact deployment, and others.
  |
  | Default: false
 -->
<offline>false</offline>  
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<!-- 
   | This will determine whether maven prompts you when it needs input. If set to false,
   | maven will use a sensible default value, perhaps based on some other setting, for
   | the parameter in question.
   |
   | Default: true
-->
<interactiveMode>true</interactiveMode>
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<!-- pluginGroups
   | This is a list of additional group identifiers that will be searched when resolving plugins by their prefix, i.e.
   | when invoking a command line like "mvn prefix:goal". Maven will automatically add the group identifiers
   | "org.apache.maven.plugins" and "org.codehaus.mojo" if these are not already contained in the list.
<pluginGroup>com.your.plugins</pluginGroup>
   |-->
<pluginGroups>  
   <!--plugin的组织Id（groupId） -->  
   <pluginGroup>org.codehaus.mojo</pluginGroup>
   <pluginGroup>org.mortbay.jetty</pluginGroup>
   <pluginGroup>com.alibaba.org.apache.maven.plugins</pluginGroup>
   <pluginGroup>com.alibaba.maven.plugins</pluginGroup>
</pluginGroups>  
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<!-- proxies
   | This is a list of proxies which can be used on this machine to connect to the network.
   | Unless otherwise specified (by system property or command-line switch), the first proxy
   | specification in this list marked as active will be used.
 |-->
 <proxies>  
      <!-- proxy
     | Specification for one proxy, to be used in connecting to the network.
     |
    <proxy>
      <id>optional</id>
      <active>true</active>
      <protocol>http</protocol>
      <username>proxyuser</username>
      <password>proxypass</password>
      <host>proxy.host.net</host>
      <port>80</port>
      <nonProxyHosts>local.net|some.host.com</nonProxyHosts>
    </proxy>
 </proxies>  
-->
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<!-- servers
   | This is a list of authentication profiles, keyed by the server-id used within the system.
   | Authentication profiles can be used whenever maven must make a connection to a remote server.
   |-->
 <>  
  <!-- server
     | Specifies the authentication information to use when connecting to a particular server, identified by
     | a unique name within the system (referred to by the 'id' attribute below).
     | 
     | NOTE: You should either specify username/password OR privateKey/passphrase, since these pairings are 
     |       used together.
     |
    <server>
      <id>deploymentRepo</id>
      <username>repouser</username>
      <password>repopwd</password>
    </server>
    -->
     <!-- Another sample, using keys to authenticate.
    <server>
      <id>siteServer</id>
      <privateKey>/path/to/private/key</privateKey>
      <passphrase>optional; leave empty if not used.</passphrase>
   </server>
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<mirrors>  
  <!-- mirrors
   | This is a list of mirrors to be used in downloading artifacts from remote repositories.
   | 
   | It works like this: a POM may declare a repository to use in resolving certain artifacts.
   | However, this repository may have problems with heavy traffic at times, so people have mirrored
   | it to several places.
   |
   | That repository definition will have a unique id, so we can create a mirror reference for that
   | repository, to be used as an alternate download site. The mirror site will be the preferred 
   | server for that repository.
   |-->
    <mirror>
      <!--This sends everything else to /public -->
      <id>center</id>
      <mirrorOf>*</mirrorOf>
      <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
    </mirror>
    <mirror>
      <!--This is used to direct the public snapshots repo in the 
          profile below over to a different nexus group -->
      <id>nexus-public-snapshots</id>
      <mirrorOf>public-snapshots</mirrorOf> 
      <url>http://maven.aliyun.com/nexus/content/repositories/snapshots/</url>
    </mirror>
</mirrors>  
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<profiles>  
   <!-- profiles
   | This is a list of profiles which can be activated in a variety of ways, and which can modify
   | the build process. Profiles provided in the settings.xml are intended to provide local machine-
   | specific paths and repository locations which allow the build to work in the local environment.
   |
   | For example, if you have an integration testing plugin - like cactus - that needs to know where
   | your Tomcat instance is installed, you can provide a variable here such that the variable is 
   | dereferenced during the build process to configure the cactus plugin.
   |
   | As noted above, profiles can be activated in a variety of ways. One way - the activeProfiles
   | section of this document (settings.xml) - will be discussed later. Another way essentially
   | relies on the detection of a system property, either matching a particular value for the property,
   | or merely testing its existence. Profiles can also be activated by JDK version prefix, where a 
   | value of '1.4' might activate a profile when the build is executed on a JDK version of '1.4.2_07'.
   | Finally, the list of active profiles can be specified directly from the command line.
   |
   | NOTE: For profiles defined in the settings.xml, you are restricted to specifying only artifact
   |       repositories, plugin repositories, and free-form properties to be used as configuration
   |       variables for plugins in the POM.
   |
   |-->
   <profile>
      <id>development</id>
      <repositories>
        <repository>
          <id>central</id>
          <url></url>
          <releases><enabled>true</enabled><updatePolicy>always</updatePolicy></releases>
          <snapshots><enabled>true</enabled><updatePolicy>always</updatePolicy></snapshots>
        </repository>
      </repositories>
     <pluginRepositories>
        <pluginRepository>
          <id>central</id>
          <url>http://central</url>
          <releases><enabled>true</enabled><updatePolicy>always</updatePolicy></releases>
          <snapshots><enabled>true</enabled><updatePolicy>always</updatePolicy></snapshots>
        </pluginRepository>
      </pluginRepositories>
    </profile>
    <profile>
      <!--this profile will allow snapshots to be searched when activated-->
      <id>public-snapshots</id>
      <repositories>
        <repository>
          <id>public-snapshots</id>
          <url>http://public-snapshots</url>
          <releases><enabled>false</enabled></releases>
          <snapshots><enabled>true</enabled><updatePolicy>always</updatePolicy></snapshots>
        </repository>
      </repositories>
     <pluginRepositories>
        <pluginRepository>
          <id>public-snapshots</id>
          <url>http://public-snapshots</url>
          <releases><enabled>false</enabled></releases>
          <snapshots><enabled>true</enabled><updatePolicy>always</updatePolicy></snapshots>
        </pluginRepository>
      </pluginRepositories>
    </profile>
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<os>  
     <!--激活profile的操作系统的名字 -->  
     <name>Windows XP</name>  
     <!--激活profile的操作系统所属家族(如 'windows')  -->  
     <family>Windows</family>  
     <!--激活profile的操作系统体系结构  -->  
     <arch>x86</arch>  
     <!--激活profile的操作系统版本-->  
     <version>5.1.2600</version>  
    </os>  
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<file>  
     <!--如果指定的文件存在，则激活profile。 -->  
     <exists>/usr/local/hudson/hudson-home/jobs/maven-guide-zh-to-production/workspace/</exists>  
     <!--如果指定的文件不存在，则激活profile。-->  
     <missing>/usr/local/hudson/hudson-home/jobs/maven-guide-zh-to-production/workspace/</missing>  
    </file>  
   </activation>  
   <properties>  
    <user.install>/ebs1/build-machine/usr/loca/</user.install>  
   </properties>  
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<repositories>  
    <!--包含需要连接到远程仓库的信息 -->  
    <repository>  
     <!--远程仓库唯一标识-->  
     <id>codehausSnapshots</id>  
     <!--远程仓库名称 -->  
     <name>Codehaus Snapshots</name>  
     <!--如何处理远程仓库里发布版本的下载-->  
     <releases>  
      <!--true或者false表示该仓库是否为下载某种类型构件（发布版，快照版）开启。  -->  
      <enabled>false</enabled>  
      <!--该元素指定更新发生的频率。Maven会比较本地POM和远程POM的时间戳。这里的选项是：always（一直），daily（默认，每日），interval：X（这里X是以分钟为单位的时间间隔），或者never（从不）。 -->  
      <updatePolicy>always</updatePolicy>  
      <!--当Maven验证构件校验文件失败时该怎么做-ignore（忽略），fail（失败），或者warn（警告）。-->  
      <checksumPolicy>warn</checksumPolicy>  
     </releases>  
     <!--如何处理远程仓库里快照版本的下载。有了releases和snapshots这两组配置，POM就可以在每个单独的仓库中，为每种类型的构件采取不同的策略。例如，可能有人会决定只为开发目的开启对快照版本下载的支持。参见repositories/repository/releases元素-->  
     <snapshots>  
      <enabled/><updatePolicy/><checksumPolicy/>  
     </snapshots>  
     <!--远程仓库URL，按protocol://hostname/path形式 -->  
     <url>http://snapshots.maven.codehaus.org/maven2</url>  
     <!--用于定位和排序构件的仓库布局类型-可以是default（默认）或者legacy（遗留）。Maven 2为其仓库提供了一个默认的布局；然而，Maven 1.x有一种不同的布局。我们可以使用该元素指定布局是default（默认）还是legacy（遗留）。 -->  
     <layout>default</layout>  
    </repository>  
   </repositories>  
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<pluginRepositories>  
    <!--包含需要连接到远程插件仓库的信息.参见profiles/profile/repositories/repository元素的说明--> 
    <pluginRepository>             
     <releases>        
      <enabled/><updatePolicy/><checksumPolicy/>  
     </releases>  
     <snapshots>  
      <enabled/><updatePolicy/><checksumPolicy/>  
     </snapshots>  
     <id/><name/><url/><layout/>  
   </pluginRepository>  
</pluginRepositories>  
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<activeProfiles>  
    <activeProfile>development</activeProfile>
    <activeProfile>public-snapshots</activeProfile>
</activeProfiles>