centos7：安装配置jdk

1、首先到官网下载jdk安装包

http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

或者直接在linux命令行下载

wget http://download.oracle.com/otn-pub/java/jdk/8u181-b13/96a7b8442fe848ef90c96a2fad6ed6d1/jdk-8u181-linux-x64.rpm

2、rpm -ivh jdk-8u181-linux-x64.rpm

# 在/etc/profile文件最后面添加下面这几行，jdk具体的路径自己ls查一下

    JAVA_HOME=/usr/java/jdk1.8.0_131

    JAVA_BIN=/usr/java/jdk1.8.0_131/bin

    PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin:/bin:/sbin/

    CLASSPATH=.:/lib/dt.jar:/lib/tools.jar

    export JAVA_HOME JAVA_BIN PATH CLASSPATH

[root@centos7 opt]# source /etc/profile

[root@centos7 opt]# java -version