1.下载

https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

2.安装

进入linux系统，创建目录

cd /usr
mkdir java

将jdk-8u211-linux-x64.tar.gz放入/usr/java目录下并解压

tar -zxvf jdk-8u211-linux-x64.tar.gz

配置环境变量

vi /etc/profile

添加以下内容并保存，注意路径

export JAVA_HOME=/usr/java/jdk1.8.0_211
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib:$CLASSPATH
export JAVA_PATH=${JAVA_HOME}/bin:${JRE_HOME}/bin
export PATH=$PATH:${JAVA_PATH}

重新加载环境变量

source /etc/profile

测试
···
[root@localhost java]# java -version
java version "1.8.0_211"
Java(TM) SE Runtime Environment (build 1.8.0_211-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.211-b12, mixed mode)
[root@localhost java]#
···