pom文件添加aliyun镜像

<repositories>
    <repository>
        <id>central</id>
        <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
        <name>aliyun</name>
    </repository>
    <repository>
        <id>springsource-repos</id>
        <name>SpringSource Repository</name>
        <url>http://repo.spring.io/release/</url>
    </repository>
    <repository>
        <id>central-repos</id>
        <name>Central Repository</name>
        <url>http://repo.maven.apache.org/maven2</url>
    </repository>
    <repository>
        <id>central-repos2</id>
        <name>Central Repository 2</name>
        <url>http://repo1.maven.org/maven2/</url>
    </repository>
</repositories>
<pluginRepositories>
    <pluginRepository>
        <id>central</id>
        <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
        <name>aliyun</name>
    </pluginRepository>
</pluginRepositories>