CentOS7 安装JKD1.8

https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html

tar -xzvf jdk-8u291-linux-x64.tar.gz -C /usr/local/java

vim /etc/profile

export JAVA_HOME=/usr/local/java/jdk1.8.0_171
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

source /etc/profile

ln -s /usr/local/java/jdk1.8.0_171/bin/java /usr/bin/java

java -version