centos安装jdk

jdk1.8官网下载地址:

https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html

rpm包安装

rpm -ivh  jdk-8u25-linux-x64.rpm

tar包安装

tar zxvf jdk1.8.0_271.tar.gz

mv jdk1.8.0_271  /opt/

#添加环境变量,在/etc/profile文末添加
vim  /etc/profile
export JAVA_HOME=/opt/jdk1.8.0_271
export JRE_HOME=/opt/jdk1.8.0_271/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib
export PATH=$JAVA_HOME/bin:$PATH

source  /etc/profile