nexus2.x 地址：
https://help.sonatype.com/repomanager2/download
部署nexus步骤:
1.下载解压安装包到指定目录
2.设置环境变量(当然还有JAVA,jdk)
3.在配置文件(G: exus exus-2.3.1-01-bundle exus-2.3.1-01injswconfwrapper.conf)里指定jdk路径
4.cmd,执行nexus install(将nexus安装到系统服务里)
5.cmd,执行nexus start
6.http://localhost:8081/nexus/index.html#welcome
