centos7安装jdk1.8

下载jdk包
http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
安装目录
/usr/share/dev
tar -xzvf *.tar.gz
mv jdk* jdk8
vim /etc/profile
末尾添加
export JAVA_HOME=/usr/share/dev/jdk8
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
环境变量生效
source /etc/profile
添加软链接
ln -s /usr/share/dev/jdk8/bin/java /usr/bin/java
检查
java -version