maven的中央（central）仓库的镜像地址

    （最快） http://maven.ibiblio.org/maven2/
    http://central.maven.org/maven2/
    http://repo1.maven.apache.org/maven2/
    http://repo1.maven.org/maven2/
    http://mirrors.ibiblio.org/pub/mirrors/maven2/
    https://repository.jboss.org/nexus/content/groups/public/
    http://repo2.maven.org/maven2/


    settings.xml

    <mirrors>
        <mirror>
          <id>google-maven-central</id>
          <name>Google Maven Central</name>
          <url>http://maven.ibiblio.org/maven2/</url>
          <mirrorOf>central</mirrorOf>
        </mirror>
    </mirrors>