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>