1.下载安装包并上传到服务器

Java Downloads | Oracle 中国

2.创建安装文件夹

mkdir /usr/local/java/
cd /usr/local/java/

3.解压

tar -zxvf /home/hana/jdk-8u333-linux-x64.tar.gz -C /usr/local/java

4.配置环境变量

vi /etc/profile

jdk8环境变量

export JAVA_HOME=/usr/local/java/jdk1.8.0_333
export JRE_HOME=$JAVA_HOME/jre 
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
export PATH=$JAVA_HOME/bin:$PATH:/usr/bin/gcc

jdk17,21环境变量

export JAVA_HOME=/usr/local/java/jdk-21.0.1
export CLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib
export PATH=$JAVA_HOME/bin:$PATH:/usr/bin/gcc

5.更新环境变量

source /etc/profile