centos 7 安装jdk8

去官网下载jdk：http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html 

解压到安装目录

[root@bogonsoftware]# tar -zxvf jdk-8u181-linux-x64.tar.gz -C /usr/local/java/

1

安装完毕之后在/etc/profile文件末尾添加

[root@bogon software]# vi /etc/profile

export JAVA_HOME=/usr/local/java/jdk1.8.0_181

export JRE_HOME=${JAVA_HOME}/jre

export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib

export PATH=${JAVA_HOME}/bin:$PATH

使/etc/profile生效

[root@bogonjdk1.8.0_101]# source /etc/profile

${JAVA_HOME}/lib:${JRE_HOME}/libexportPATH=${JAVA_HOME}/bin:$PATH