Maven替换为国内仓库

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

G:apache-maven-3.3.9confsettings.xml