centos7 安装jdk8教程

查看当前默认jdk版本

java -version

java version "1.7.0_121"
OpenJDK Runtime Environment (rhel-2.6.8.1.el6_8-x86_64 u121-b00)
OpenJDK 64-Bit Server VM (build 24.121-b00, mixed mode)

查看JDK信息

rpm -qa | grep java

java-1.7.0-openjdk-1.7.0.121-2.6.8.1.el6_8.x86_64
tzdata-java-2016j-1.el6.noarch
java-1.6.0-openjdk-1.6.0.41-1.13.13.1.el6_8.x86_64

卸载OpenJDK

rpm -e --nodeps java-1.7.0-openjdk-1.7.0.121-2.6.8.1.el6_8.x86_64
rpm -e --nodeps tzdata-java-2016j-1.el6.noarch
rpm -e --nodeps java-1.6.0-openjdk-1.6.0.41-1.13.13.1.el6_8.x86_64

安装JDK

wget http://download.oracle.com/otn-pub/java/jdk/8u121-b13/e9e7ea248e2c4826b92b3f075a80e441/jdk-8u121-linux-x64.rpm?AuthParam=1488889909_687cff595c48e8f83e9bb3ea99dafadb
rpm -ivh jdk-8u25-linux-x64.rpm

验证安装

java -version

配置环境变量

vi /etc/profile
    JAVA_HOME=/usr/java/jdk1.8.0_25
    JRE_HOME=/usr/java/jdk1.8.0_25/jre
    PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
    export JAVA_HOME JRE_HOME PATH
source /etc/profile