查看线上所有JDK
yum -y list java*

安装JDK  
yum -y install java-1.8.0-openjdk*  

配置环境变量  
vi /etc/profile  

添加环境变量
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-0.b14.el7_4.x86_64
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar.:$JAVA_HOME/lib/dt.jar.:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin

查看线上所有JDK
yum -y list java*

安装JDK  
yum -y install java-1.8.0-openjdk*  

配置环境变量  
vi /etc/profile  

添加环境变量
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-0.b14.el7_4.x86_64
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar.:$JAVA_HOME/lib/dt.jar.:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin