下载安装包
[root@localhost mazixuan]# wget https://mirrors.tuna.tsinghua.edu.cn/Adoptium/8/jdk/x64/linux/OpenJDK8U-jdk_x64_linux_hotspot_8u492b09.tar.gz
--2026-05-08 15:30:06-- https://mirrors.tuna.tsinghua.edu.cn/Adoptium/8/jdk/x64/linux/OpenJDK8U-jdk_x64_linux_hotspot_8u492b09.tar.gz
正在解析主机 mirrors.tuna.tsinghua.edu.cn (mirrors.tuna.tsinghua.edu.cn)... 101.6.15.130, 2402:f000:1:400::2
正在连接 mirrors.tuna.tsinghua.edu.cn (mirrors.tuna.tsinghua.edu.cn)|101.6.15.130|:443... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度：103553239 (99M) [application/octet-stream]
正在保存至: “OpenJDK8U-jdk_x64_linux_hotspot_8u492b09.tar.gz”
OpenJDK8U-jdk_x64_linux_hotsp 100%[==============================================>] 98.76M 6.29MB/s 用时 14s
2026-05-08 15:30:21 (7.04 MB/s) - 已保存 “OpenJDK8U-jdk_x64_linux_hotspot_8u492b09.tar.gz” [103553239/103553239])
[root@localhost mazixuan]#
[root@localhost mazixuan]#
[root@localhost mazixuan]# ll
总计 101128
-rw-r--r-- 1 root root 103553239 5月 4日 19:45 OpenJDK8U-jdk_x64_linux_hotspot_8u492b09.tar.gz
[root@localhost mazixuan]#
解压到 /usr/local 目录
[root@localhost mazixuan]# sudo tar -zxvf OpenJDK8U-jdk_x64_linux_hotspot_8u492b09.tar.gz -C /usr/local/
jdk8u492-b09/查看解压后的目录名
[root@localhost mazixuan]# ls /usr/local | grep jdk
jdk8u492-b09设置环境变量
sudo vi /etc/profile添加如下
#java
export JAVA_HOME=/usr/local/jdk8u492-b09
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar使配置生效并验证
#刷新环境变量
[root@localhost mazixuan]# source /etc/profile
#查看你JAVA版本
[root@localhost mazixuan]# java -version
openjdk version "1.8.0_492"
OpenJDK Runtime Environment (Temurin)(build 1.8.0_492-b09)
OpenJDK 64-Bit Server VM (Temurin)(build 25.492-b09, mixed mode)
#验证编译器
[root@localhost mazixuan]# javac -version
javac 1.8.0_492
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