Linux安装JDK1.8

环境：CentOS 7.4.1708

1. 解压JDK：tar zxvf server-jre-8u202-linux-x64.tar.gz
2. 配置环境变量: vim /etc/profile

export JAVA_HOME=/opt/jdk/jdk1.8.0_202  
export JRE_HOME=${JAVA_HOME}/jre  
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib  
export  PATH=${JAVA_HOME}/bin:$PATH

3. 执行source /etc/profile
4. 检查安装java -version