CentOS 7安裝Oracle JDK，查看Linux是否自帶的JDK，如有openJDK，則卸載
java -version
rpm -qa | grep -E '^open[jre|jdk]|j[re|dk]'
卸載openjdk
su root
yum -y remove java java-1.7.0-openjdk
下載oracle jdk
wget --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie;" http://download.oracle.com/otn-pub/java/jdk/8u77-b03/jdk-8u77-linux-x64.tar.gz
解壓jdk
tar -xzvf jdk-8u77-linux-x64.tar.gz
移動jdk到/usr/local，建立軟連接
mv jdk1.8.0_77/ /usr/local
ln -s /usr/local/jdk1.8.0_77/ /usr/local/jdk
編輯/etc/profile
vim /etc/profile
加入jdk的配置
JAVA_HOME=/usr/local/jdk
PATH=${PATH}:${JAVA_HOME}/bin
export JAVA_HOME PATH
source
source /etc/profile
查看是否安裝jdk成功
java -version
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