centos 安装jdk8

1.官网下载
https://www.oracle.com/cn/java/technologies/javase/javase-jdk8-downloads.html

2.解压在 /usr/local/java/下，重命名 jdk1.8

tar -zxvf jdk-8u271-linux-x64.tar.gz
mv jdk1.8.0_271  jdk1.8

3.配置环境变量

export JAVA_HOME=/usr/local/java/jdk1.8
export PATH=$PATH:$JAVA_HOME/bin

source /etc/profile 使环境变量生效

4.查看是否安装成功

java -version
java
javac