Nexus_008：配置 Nexus 2 私服前后编译项目的异同

环境： OS X EI Capitan 10.11.3 + JDK 1.7.0_80 + Maven 3.3.9 + Nexus 2.12.0-01

生成Maven项目的命令
mvn archetype:generate -DgroupId=com.mycompany.app -DartifactId=my-webapp -DarchetypeArtifactId=maven-archetype-webapp -Dversion=1.0-SNAPSHOT -DinteractiveMode=false

1.  配置Nexus私服前
（1）~/.m2/settings.xml

<?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">

</settings>

（2）编译项目
所有构件都是从Maven远程中央仓库下载，并保存到Maven本地库：~/.m2/repository。

3.  配置Nexus私服后
 （1）~/.m2/settings.xml
<?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">

  <servers>
    <server>
      <id>releases</id>
      <username>admin</username>
      <password>admin123</password>
    </server>
    <server>
      <id>snapshots</id>
      <username>admin</username>
      <password>admin123</password>
    </server>
  </servers>

  <mirrors>
    <mirror>
      <id>nexus</id>
      <mirrorOf>*</mirrorOf>
      <url>http://localhost:8081/nexus/content/groups/public/</url>
    </mirror>
  </mirrors>

  <profiles>

    <!-- Configure the Private Nexus repository -->
    <profile>
      <id>nexus</id>
      <repositories>
        <repository>
          <id>nexus</id>
          <name>Nexus</name>
          <layout>default</layout>
          <url>http://localhost:8081/nexus/content/groups/public/</url>
          <releases>
            <enabled>true</enabled>
          </releases>
          <snapshots>
            <enabled>true</enabled>
          </snapshots>
        </repository>
      </repositories>
      <pluginRepositories>
        <pluginRepository>
          <id>nexus</id>
          <name>Nexus</name>
          <layout>default</layout>
          <url>http://localhost:8081/nexus/content/groups/public/</url>
          <releases>
            <enabled>true</enabled>
          </releases>
          <snapshots>
            <enabled>true</enabled>
          </snapshots>
        </pluginRepository>
      </pluginRepositories>
    </profile>

  </profiles>

  <activeProfiles>
    <activeProfile>nexus</activeProfile>
  </activeProfiles>

</settings>

（2）编译项目
所有构件都是从Nexus私服下载，并保存到Maven本地库：~/.m2/repository。
如果Nexus私服上没有构件，会从Maven远程中央仓库下载，保存到私服上，位置在 sonatype-work/nexus/storage/central 等代理库。