yum安装jdk

yum -y install java-1.8.0-openjdk*

配置环境变量

vim /etc/profile
export JAVA_HOME=/usr/lib/jvm/jre-1.8.0-openjdk
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

生效

source /etc/profile