官网：https://www.oracle.com/cn/java/technologies/downloads/
下载地址：https://www.oracle.com/cn/java/technologies/downloads/#java8
下载最好直接在官网页面上点击下载
[root@m01 soft]# rpm -ivh jdk-8u391-linux-x64.rpm
警告：jdk-8u391-linux-x64.rpm: 头V3 RSA/SHA256 Signature, 密钥 ID ad986da3: NOKEY
准备中... ################################# [100%]
正在升级/安装...
1:jdk-1.8-2000:1.8.0_391-13 ################################# [100%]
[root@m01 soft]# java -version
java version "1.8.0_391"
Java(TM) SE Runtime Environment (build 1.8.0_391-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.391-b13, mixed mode)