Centos7安装Java

mkdir -p /usr/local/java1.8
cd /usr/local/java1.

http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html   # 下载
tar -zvxf jdk-8u241-linux-x64.tar.gz    # 解压

vim /etc/profile
export JAVA_HOME=/usr/local/java1.8/jdk1.8.0_241
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/java1.8/jdk1.8.0_241/bin/java /usr/bin/java

java -version