mvn compile速度慢解决方法，配置镜像

-<mirrors>

<!-- mirror | Specifies a repository mirror site to use instead of a given repository. The repository that | this mirror serves has an ID that matches the mirrorOf element of this mirror. IDs are used | for inheritance and direct lookup purposes, and must be unique across the set of mirrors. | <mirror> <id>mirrorId</id> <mirrorOf>repositoryId</mirrorOf> <name>Human Readable Name for this Mirror.</name> <url>http://my.repository.com/repo/path</url> </mirror> -->

<!-- mirror | Specifies a repository mirror site to use instead of a given repository. The repository that | this mirror serves has an ID that matches the mirrorOf element of this mirror. IDs are used | for inheritance and direct lookup purposes, and must be unique across the set of mirrors. | <mirror> <id>mirrorId</id> <mirrorOf>repositoryId</mirrorOf> <name>Human Readable Name for this Mirror.</name> <url>http://my.repository.com/repo/path</url> </mirror> -->

-<mirror>

<id>alimaven</id>

<name>aliyun maven</name>

<url>http://maven.aliyun.com/nexus/content/groups/public/</url>

<mirrorOf>central</mirrorOf>

</mirror>

-<mirror>

<id>uk</id>

<mirrorOf>central</mirrorOf>

<name>Human Readable Name for this Mirror.</name>

<url>http://uk.maven.org/maven2/</url>

</mirror>

-<mirror>

<id>CN</id>

<name>OSChina Central</name>

<url>http://maven.oschina.net/content/groups/public/</url>

<mirrorOf>central</mirrorOf>

</mirror>

-<mirror>

<id>nexus</id>

<name>internal nexus repository</name>

<!-- <url>http://192.168.1.100:8081/nexus/content/groups/public/</url>-->

<url>http://repo.maven.apache.org/maven2</url>

<mirrorOf>central</mirrorOf>

</mirror>

</mirrors>