1.下载jdk
https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
cd /usr
mkdir java
tar –zxvf jdk1.8.0_144.tar.gz
#建立一个链接以节省目录长度
ln -s /usr/java/jdk1.8.0_144 /usr/jdk
2.配置环境变量
vi /etc/profile
JAVA_HOME=/usr/jdk
CLASSPATH=$JAVA_HOME/lib/
PATH=$PATH:$JAVA_HOME/bin
export PATH JAVA_HOME CLASSPATH
# 使配置生效
source /etc/profile
3.查看是否配置成功
java -version
java version "1.8.0_121"
Java(TM) SE Runtime Environment (build 1.8.0_121-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.121-b13, mixed mode)
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