下载

wget https://download.oracle.com/java/21/archive/jdk-21.0.3_linux-x64_bin.tar.gz

其他版本可以在这里下载: https://www.oracle.com/java/technologies/downloads/archive/

创建安装目录

mkdir -p /usr/local/java/

解压

tar -zxvf jdk-21.0.3_linux-x64_bin.tar.gz -C /usr/local/java/

# 删除压缩包
rm -rf jdk-21.0.3_linux-x64_bin.tar.gz

设置环境变量

vim /etc/profile

在末尾添加：

export JAVA_HOME=/usr/local/java/jdk-21.0.3
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

使环境变量生效：

source /etc/profile

检查

java -version

Reference

CentOS7安装JDK8