Linux安装：jdk环境，java环境

下载并解压

wget http://xxxx.com/jdk-8u301-linux-x64.tar.gz
tar -zxvf jdk-8u301-linux-x64.tar.gz

配置环境变量

vi /etc/profile

export JAVA_HOME=/opt/jdk1.8.0_212
export JRE_HOME=/opt/jdk1.8.0_212/jre
export PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
export CLASSPATH=.:$CLASSPATH:$JAVA_HOME/lib:$JRE_HOME/lib

环境变量生效

source /etc/profile

ln -s /opt/jdk1.8.0_212/bin/java /usr/bin/java