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06、Linux安装JDK21 ​

1、下载JDK ​

https://www.azul.com/downloads/?version=java-21-lts&os=linux&package=jdk#zulu

image-20250728171615753

点击直接下载

2、配置JDK环境变量 ​

1、先上传下载好的jdk到服务器 ​

sh
[root@xx-blog jdk]# pwd
/opt/jdk
[root@xx-blog jdk]# ls
zulu21.44.17-ca-jdk21.0.8-linux_x64.tar.gz
[root@xx-blog jdk]#

2、配置环境变量 ​

sh
# 解压
tar -xzf zulu21.44.17-ca-jdk21.0.8-linux_x64.tar.gz

# 重命名
mv zulu21.44.17-ca-jdk21.0.8-linux_x64 jdk21.0.8

vi /etc/profile
# 输入大写G到末尾  输入i进入编辑模式 

# 配置以下
JAVA_HOME=/opt/jdk/jdk21.0.8
PATH=/opt/jdk/jdk21.0.8/bin:$PATH
export JAVA_HOME PATH

# 使配置文件生效
source /etc/profile

# 验证 
java --version

[root@xx-blog jdk]# java --version
openjdk 21.0.8 2025-07-15 LTS
OpenJDK Runtime Environment Zulu21.44+17-CA (build 21.0.8+9-LTS)
OpenJDK 64-Bit Server VM Zulu21.44+17-CA (build 21.0.8+9-LTS, mixed mode, sharing)