解决IDEA中Maven加载依赖包慢的问题

原理：maven加载jar包过程，默认的是先扫描本地仓库，若本地仓库没有，则扫描远程仓库下载。默认的conf/settings.xml文件没有配置远程仓库，所以扫描的是maven的中央仓库（在国外），所以慢。

解决方法：配置国内镜像（如阿里云的镜像）

修改conf/settings.xml文件，配置阿里云镜像代码

 <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>
     <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>