maven pom repositories

<repositories>
        <repository>
            <id>aliyun-central</id>
            <name>Aliyun Central</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>central</id>
            <name>Maven Central</name>
            <url>http://repo1.maven.org/maven2/</url>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>aliyun-central</id>
            <name>Aliyun Central</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public</url>
        </pluginRepository>
        <pluginRepository>
            <id>central</id>
            <name>Maven Central</name>
            <url>http://repo1.maven.org/maven2/</url>
        </pluginRepository>
    </pluginRepositories>