pom文件中配置repositories

1. 配置远程中心仓

<repositories>
	<repository>
		<id>maven-ali</id>
		<url>http://maven.aliyun.com/nexus/content/groups/public</url> 
		<releases>
        	<enabled>true</enabled>
      	</releases>
      	<snapshots>
        	<enabled>false</enabled>
      	</snapshots>
	</repository>
</repositories>