下载jdk
http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html创建目录
mkdir /usr/local/java/解压到目录
tar -zxvf jdk-8u171-linux-x64.tar.gz -C /usr/local/java/
4.配置环境变量
vim /etc/profile
vim /etc/profile
export JAVA_HOME=/usr/local/java/jdk1.8.0_241
export JRE_HOME={JAVA_HOME}/lib:
{JAVA_HOME}/bin:$PATH
source /etc/profile
ln -s /usr/local/java/jdk1.8.0_241/bin/java /usr/bin/java
5.验证
java -version
