Nexus配置內部倉庫

關於創建Nexus不想多說，到官方網站http://www.sonatype.org/nexus下載WAR，直接在TOMCAT下發布就OK了。具體記錄怎樣配置Maven使用Nexus作爲內部庫，官方有一篇文章《Configuring Maven to Use a Single Nexus Group》

If you are adopting Nexus for internal development you should configure a single Nexus group which contains both releases and snapshots. To do this, add snapshot repositories to your public group, and add the following mirror configuration to your Maven settings in ~/.m2/settings.xml

<settings>
  <mirrors>
    <mirror>
      <!--This sends everything else to /public -->
      <id>nexus</id>
      <mirrorOf>*</mirrorOf>
      <url>http://localhost:8081/nexus/content/groups/public</url>
    </mirror>
  </mirrors>
  <profiles>
    <profile>
      <id>nexus</id>
      <!--Enable snapshots for the built in central repo to direct -->
      <!--all requests to nexus via the mirror -->
      <repositories>
        <repository>
          <id>central</id>
          <url>http://central</url>
          <releases><enabled>true</enabled></releases>
          <snapshots><enabled>true</enabled></snapshots>
        </repository>
      </repositories>
     <pluginRepositories>
        <pluginRepository>
          <id>central</id>
          <url>http://central</url>
          <releases><enabled>true</enabled></releases>
          <snapshots><enabled>true</enabled></snapshots>
        </pluginRepository>
      </pluginRepositories>
    </profile>
  </profiles>
  <activeProfiles>
    <!--make the profile active all the time -->
    <activeProfile>nexus</activeProfile>
  </activeProfiles>
</settings>

 In Configuring Maven to Use a Single Nexus Group we have defined a single profile: nexus profile is configured to download from the central repository with a bogus URL. This URL is overridden by the mirror setting in the same settings.xml file to point to the URL of your single Nexus group. The nexus group is then listed as an active profile in the activeProfiles element.

配置完成後，使用mv package命令出錯，提示：
org.apache.maven.plugins:maven-resources-plugin:2.5 or one of its dependencies could not be resolved

最後不斷嘗試，發現將<mirror>節點的<id>的值改爲central,package命令成功執行。而且發現無須配置<profiles>,依然可以執行成功。

settings.xml最終配置如下：

<?xml version="1.0" encoding="UTF-8"?>

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0" 
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
  <!-- localRepository
   | The path to the local repository maven will use to store artifacts.
   |
   | Default: ~/.m2/repository
  <localRepository>C:/apache-maven-3.0.4/repository</localRepository>
  -->

  <!-- interactiveMode
   | 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>
  -->

  <!-- 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>
  -->

  <!-- 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.
   |-->
  <pluginGroups>
    <!-- pluginGroup
     | Specifies a further group identifier to use for plugin lookup.
    <pluginGroup>com.your.plugins</pluginGroup>
    -->

	<pluginGroup>org.mortbay.jetty</pluginGroup>
  </pluginGroups>


  <!-- 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>
  </proxies>

  <!-- 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.
   |-->
  <servers>
    <!-- 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>
    -->
    <server>
      <id>nexus</id>
      <username>admin</username>
      <password>xxxxxx</password>
    </server>
  </servers>

  <!-- 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.
   |-->
  <mirrors>
    <!-- mirror
     | Specifies a repository mirror site to use instead of a given repository. The repository that
     | this mirror serves has an ID that matches the mirrorOf element of this mirror. IDs are used
     | for inheritance and direct lookup purposes, and must be unique across the set of mirrors.
     |
    
    <mirror>  
      <id>central</id>
      <mirrorOf>*</mirrorOf> 
      <name>Maven Central</name>  
      <url>http://localhost:8081/nexus/content/repositories/central/</url>  
    </mirror>    
     -->
  </mirrors>
  

  <profiles>
   <profile>
      <id>dev</id>

      <repositories>
        <repository>
          <id>nexus</id>
          <name>Nexus Repository</name>
          <url>http://localhost:8081/nexus/content/groups/public/</url>
	 <releases>
	       <enabled>true</enabled>
	 </releases>
          <snapshots>
                <enabled>false</enabled>
          </snapshots>
        </repository>

        <repository>
          <id>thirdparty</id>
          <name>thirdparty</name>
          <url>http://localhost:8081/nexus/content/repositories/thirdparty/</url>
	 <releases>
	       <enabled>true</enabled>
	 </releases>
          <snapshots>
                <enabled>false</enabled>
          </snapshots>
        </repository>
      </repositories>
      
      <pluginRepositories>
		<pluginRepository>
			<id>nexus</id>
			<url>http://localhost:8081/nexus/content/groups/public/</url>
			<releases>
			  <enabled>true</enabled>
		    </releases>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
		</pluginRepository>
	</pluginRepositories>
	
    </profile>
  </profiles>

    
  <activeProfiles>
    <activeProfile>dev</activeProfile>
  </activeProfiles>
  
  <!-- activeProfiles
   | List of profiles that are active for all builds.
   |

  <activeProfiles>
    <activeProfile>alwaysActiveProfile</activeProfile>
    <activeProfile>anotherAlwaysActiveProfile</activeProfile>
  </activeProfiles>
  -->
</settings>

注意：<profile>中的<id>的值一定要爲nexus，而且要與<server>的<id>的值相同，個人認爲此與Server配置下的Base URL:http://xxx.xx.xx.xxx:8081/nexus有關，另外我註釋掉了<mirror>，主要在無法訪問MAVEN中心庫才啓用。