1.下载压缩包
2.拷贝到 /home/ 目录下
3.执行解压命令
tar –xvf jjdk-8u161-linux-x64.tar.gz –C /usr/local
4.配置jdk 环境变量 vi /etc/profile
#set java environment
JAVA_HOME=/usr/local/jdk1.8.0_161
CLASSPATH=.:$JAVA_HOME/lib.tools.jar
PATH=$JAVA_HOME/bin:$PATH
export JAVA_HOME CLASSPATH PATH