参考：
https://www.cnblogs.com/2YSP/p/9533506.html
http://www.54tianzhisheng.cn/2017/10/14/Nexus3-Maven/
https://zhuanlan.zhihu.com/p/30188482
https://www.cnblogs.com/kevingrace/p/6201984.html
https://blog.csdn.net/shangyuanlang/article/details/81158458