安装jdk

1.安装jdk

jdk下载：http://www.oracle.com/technetwork/java/javase/downloads/index.html

源码包安装jdk

[root@master ~]# tar xf jdk-8u191-linux-x64.tar.gz -C /usr/local/
[root@master ~]# cd /usr/local/
[root@master local]# ln -sv jdk1.8.0_191/ jdk
"jdk" -> "jdk1.8.0_191/"

配置环境变量：

[root@master local]# vi /etc/profile.d/jdk.sh
JAVA_HOME=/usr/local/jdk
PATH=$JAVA_HOME/bin:$PATH
export JAVA_HOME PATH

[root@master local]# chmod o+x /etc/profile.d/jdk.sh 
[root@master local]# /etc/profile.d/jdk.sh

查看java版本。

[root@master local]# ln -sv /usr/local/jdk1.8.0_191/jre/bin/java /usr/local/bin
"/usr/local/bin/java" -> "/usr/local/jdk1.8.0_191/jre/bin/java"
[root@master local]# java -version
java version "1.8.0_191"
Java(TM) SE Runtime Environment (build 1.8.0_191-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)