前提

Java安装包地址：https://www.oracle.com/java/technologies/downloads/#java8

  1. 链接：https://pan.baidu.com/s/1nzcQMcEQ5MgSSJ9hi4suxQ 
  2. 提取码：z5m6

Ftp传输工具推荐：FileZilla

创建-解压

创建JDK安装目录

  1. cd /opt/ 
  2. mkdir java
  3. cd java

解压 JDK

  1. tar -zxvf /root/jdk-8u321-linux-x64.tar.gz

修改系统环境变量，并使之生效

配置系统变量

  1. vi /etc/profile
  3. export JAVA_HOME=/opt/java/jdk1.8.0_321
  4. export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
  5. export PATH=$JAVA_HOME/bin:$PATH

刷新配置

  1. source /etc/profile

查看

  1. java -version

结果

  1. java version "1.8.0_321"
  2. Java(TM) SE Runtime Environment (build 1.8.0_321-b07)
  3. Java HotSpot(TM) 64-Bit Server VM (build 25.321-b07, mixed mode)