环境:
ubuntu版本:ubuntu~18.04.1
jdk版本: 1.8.0_111
---------------------------------------------------------------------------------
jdk的软件包:jdk-8u111-linux-x64.tar.gz
上传到/opt下
1.解压缩
cd /opt
tar -zxvf jdk-8u111-linux-x64.tar.gz
mv /opt/jdk1.8.0_111/ /usr/local/jdk1.8
2.设置环境变量-修改全局变量
vim /etc/profile
export JAVA_HOME=/usr/local/jdk1.8
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=.:${JAVA_HOME}/bin:$PATH
#保存退出
source /etc/profile
3.测试
java -version
java version "1.8.0_111"
Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, mixed mode)