centos7安装jdk1.8

wget --header "Cookie: oraclelicense=accept-securebackup-cookie" https://javadl.oracle.com/webapps/download/AutoDL?BundleId=243711_61ae65e088624f5aaa0b1d2d801acb16  -O jdk-8u271-linux-x64.rpm

yum localinstall jdk-8u271-linux-x64.rpm 
ls -lsah /usr/java/

java -version
update-alternatives --config java

#vim /etc/profile
export JAVA_HOME=/usr/java/jdk1.8.0_271-amd64
export JRE_HOME=/usr/java/jdk1.8.0_271-amd64/jre

PATH=$PATH:$HOME/bin:$JAVA_HOME/bin

export PATH