centos 7安装Oracle JDK，查看linux是否自带的JDK，如有openJDK，则卸载

java -version

rpm -qa | grep -E '^open[jre|jdk]|j[re|dk]'

卸载openjdk

su root
yum -y remove java java-1.7.0-openjdk

下载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

解压jdk

tar -xzvf jdk-8u77-linux-x64.tar.gz

移动jdk到/usr/local，建立软连接

mv jdk1.8.0_77/ /usr/local
ln -s /usr/local/jdk1.8.0_77/ /usr/local/jdk

编辑/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

查看是否安装jdk成功

java -version

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