[系统运维]在Linux下安装JDK，并配置JAVA_HOME环境变量

1. 下载 JDK 的压缩包: jdk1.8
   
2. 上传 jdk 压缩文件到 Linux 并解压
   
   解压：tar -zxvf jdk压缩文件名
3. 配置环境变量

[root@localhost ~]# cat ~/.bash_profile
# .bash_profile

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
        . ~/.bashrc
fi

# User specific environment and startup programs
export JAVA_HOME=/opt/jdk1.8
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin

export PATH

4. 验证

[root@localhost ~]# java -version
java version "1.8.0_301"
Java(TM) SE Runtime Environment (build 1.8.0_301-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.301-b09, mixed mode)