http://192.168.xx.xxx:8081/#admin/repository/repositories:maven-central
配置上国内源：http://maven.aliyun.com/nexus/content/groups/public
http://192.168.xx.xxx:8081/#admin/repository/repositories:maven-releases
配置允许 deploy: Allow redeploy
maven nexus 相关版本下载
https://help.sonatype.com/repomanager3/product-information/download/download-archives---repository-manager-3
https://blog.51cto.com/u_13753753/5917648
