在CentOS 7/6.5/6.4 中安装Java JDK 8 http://www.linuxidc.com/Linux/2014-12/110211.htm yum -y install wget 安装wget命令 yum install perl-Digest-SHA -y 安装shasum命令 systemctl stop firewalld.service Centos7 直接关闭防火墙 systemctl disable firewalld.service Centos7 禁止firewall开机启动