centos7 java環境

1.更新程式包

yum update

2.檢查系統是否已安裝java

java -version

3.若有，使用yum remove進行删除

4.下載下傳安裝包

wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u172-b11/a58eab1ec242421181065cdc37240b08/jdk-8u172-linux-x64.rpm"

5.在下載下傳目錄執行安裝指令

rpm -ivh jdk-8u172-linux-x64.rpm

6.将java放在"/opt/software"中

mv /usr/java /opt/software

7.在"/etc/profile.d"下建立"java.sh"

vim /etc/profile.d/java.sh

8.編輯内容

#!/bin/bash

JAVA_HOME=/opt/software/java/jdk1.8.0_172-amd64/

PATH=$JAVA_HOME/bin:$PATH

export PATH JAVA_HOME

export CLASSPATH=.

9.執行指令，使java.sh可運作

chmod +x /etc/profile.d/java.sh

10.執行指令，設定永久環境變量

source /etc/profile.d/java.sh