阿里云ECS服务器，Centos7.3系统，安装jdk

配置环境变量：vim /etc/profile

export JAVA_HOME=/usr/local/java/jdk1.8.0_112
export CLASSPATH=.:${JAVA_HOME}/jre/lib/rt.jar:%JAVA_HOME%/lib/dt.jar:%JAVA_HOME%/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin

source /etc/profile

测试：javac
或者 Java -version

wget https://repo.huaweicloud.com/java/jdk/8u201-b09/jdk-8u201-linux-x64.tar.gz

tar -zxvf jdk-8u201-linux-x64.tar.gz

usermod -aG wheel lui -----赋权给用户有sudo权限
gpasswd -d lui wheel -----取消赋权