maven的中央仓库是外国网站，访问速度可能比较慢，通过添加仓库镜像的方法可以极大的提升速度。
打开maven安装目录下的conf文件夹，打开settings.xml文件，找到<mirrors></mirrors>节点，添加 镜像子节点，修改后节点如下：
<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> <id>alimaven</id> <mirrorOf>central</mirrorOf> <name>aliyun maven</name> <url>http://maven.aliyun.com/nexus/content/groups/public/</url> </mirror> </mirrors>
