rpm -qa|grep jdkhttps://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
rpm -ivh jdk-8uversion-linux-x64.rpmrpm -qpl jdk-8uversion-linux-x64.rpmvim /etc/profile加入下面两行
export JAVA_HOME=/usr/java/jdk1.8.0_181-amd64
export PATH=$JAVA_HOME/bin:$PATH原文：https://www.cnblogs.com/mengjianzhou/p/11105609.html