maven搭建编程环境

配置阿里云镜像来解决访问国外*仓库慢问题

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