centos7安装jdk8

cd /opt

mkdir -p /opt/java

tar -zxvf /opt/jdk-8u181-linux-x64.tar.gz -C /opt/java/

vim /etc/profile#以下配置加到最后

#set java environment

export JAVA_HOME=/opt/java/jdk1.8.0_181/

export JAVA_BIN=/opt/java/jdk1.8.0_181/bin/

export JRE_HOME=/opt/java/jdk1.8.0_181/jre

export PATH=$JAVA_HOME/bin:$PATH

export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

java -version

source /etc/profile