maven 添加国内镜像源

https://www.cnblogs.com/huiyi0521/p/10997146.html

ｓｅｔｔｉｎｇ配置有效

  <mirrors>
      <mirror>
              <id>alimaven</id>
              <name>aliyun maven</name>
              <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
              <mirrorOf>central</mirrorOf>        
    </mirror>
  </mirrors>