maven安装目录下conf文件夹settings.xml
把镜像源改为阿里云的，下载jar包飞快~！
<mirror>
<id>alimaven</id>
<mirrorOf>central</mirrorOf>
<name>aliyun maven</name>
<url>http://maven.aliyun.com/nexus/content/groups/public/</url>
</mirror>