RPM方式安装JDK
查看安装的jdk
rpm -qa|grep jdk
下载jdk
https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
安装JDK
rpm -ivh jdk-8uversion-linux-x64.rpm
查看jdk安装在哪里
rpm -qpl jdk-8uversion-linux-x64.rpm
修改/etc/profile文件
vim /etc/profile
加入下面两行
export JAVA_HOME=/usr/java/jdk1.8.0_181-amd64
export PATH=$JAVA_HOME/bin:$PATH