几个maven仓库镜像

<!--<mirror>-->
  <!--<id>alimaven</id>-->
  <!--<name>aliyun maven</name>-->
  <!--<url>http://maven.aliyun.com/nexus/content/groups/public/</url>-->
  <!--<mirrorOf>central</mirrorOf>-->
<!--</mirror>-->
<mirror>
  <id>central</id>
  <name>Maven Repository Switchboard</name>
  <url>http://repo1.maven.org/maven2/</url>
  <mirrorOf>central</mirrorOf>
</mirror>
<mirror>
  <id>repo2</id>
  <mirrorOf>central</mirrorOf>
  <name>Human Readable Name for this Mirror.</name>
  <url>http://repo2.maven.org/maven2/</url>
</mirror>
<mirror>
  <id>ibiblio</id>
  <mirrorOf>central</mirrorOf>
  <name>Human Readable Name for this Mirror.</name>
  <url>http://mirrors.ibiblio.org/pub/mirrors/maven2/</url>
</mirror>
<mirror>
  <id>jboss-public-repository-group</id>
  <mirrorOf>central</mirrorOf>
  <name>JBoss Public Repository Group</name>
  <url>http://repository.jboss.org/nexus/content/groups/public</url>
</mirror>