centos7.0安装离线JDK1.8方法详解

rpm -qa|grep jdk
java-1.8.0-openjdk-headless-1.8.0.65-3.b17.el7.x86_64 
 java-1.7.0-openjdk-1.7.0.91-2.6.2.3.el7.x86_64 
 java-1.7.0-openjdk-headless-1.7.0.91-2.6.2.3.el7.x86_64 
 java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64

yum -y remove java-1.8.0-openjdk-headless-1.8.0.65-3.b17.el7.x86_64

cd home; 
 adduser hadoop; 
 passwd hadoop; 
 whereis sudoers 
 ls -l /etc/sudoers

Allow root to run any commands anywhere
root ALL=(ALL) ALL 
 hadoop ALL=(ALL) ALL #this is new add user 
 //————————— 
ls -l /etc/sudoers

chmod -v u-w /etc/sudoers 
 sudo -u hadoop 
 sudo cat /etc/passwd

tar -zxvf jdk-8u172-linux-x64.gz -C /home/hadoop/java/

[root@hadoop-localhost jdk1.8]# pwd 
 /home/hadoop/java/jdk1.8

//## JAVA 
 export JAVA_HOME=/home/hadoop/java/jdk1.8 
 //jdk的绝对路径（我的是：/home/hadoop/java/jdk1.8）
export PATH=PATH: 
PATH:
JAVA_HOME/bin

source /etc/profile
[root@hadoop-localhost jdk1.8]# source /etc/profile
java -version
[root@hadoop-localhost jdk1.8]# java -version 
 java version “1.8.0_172” 
Java(TM) SE Runtime Environment (build 1.8.0_172-b11) 
 Java HotSpot(TM) 64-Bit Server VM (build 25.172-b11, mixed mode)