[root@hadoop801 ~]# mkdir /usr/local/java
[root@hadoop801 ~]# mv jdk-8u181-linux-x64.tar.gz /usr/local/java
[root@hadoop801 java]# cd /usr/local/java/
[root@hadoop801 java]# tar -zxvf jdk-8u181-linux-x64.tar.gz
[root@hadoop801 java]# ls
jdk1.8.0_181 jdk-8u181-linux-x64.tar.gz
[root@hadoop801 ~]# vi /etc/profile
# 在文件最后追加三个环境变量
export JAVA_HOME=/usr/local/java/jdk1.8.0_181
export CLASSPATH=$:CLASSPATH:$JAVA_HOME/lib/
export PATH=$PATH:$JAVA_HOME/bin
# 加载配置
[root@hadoop801 ~]# source /etc/profile
[root@hadoop801 ~]# java -version
java version "1.8.0_181"
Java(TM) SE Runtime Environment (build 1.8.0_181-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode)
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