centos7 安裝jdk1.8

centOS7環境下安裝jdk1.8

1.首先下載下傳jdk1.8  去官網下載下傳jdk：http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html  

我這裡下載下傳的是 jdk-8u291-linux-x64.tar.gz

2.解壓到指定的目錄  解壓指令

[root@rac01 soft]#mkdir -p /usr/local/java

[root@rac01 soft]#tar -zxvf jdk-8u291-linux-x64.tar.gz -C /usr/local/java/

3.修改配置檔案,讓其生效

編輯/etc/下的profile檔案，配置環境變量

[root@rac02 soft]#  vi /etc/profile

export JAVA_HOME=/usr/local/java/jdk1.8.0_291

export JRE_HOME=${JAVA_HOME}/jre

export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib

export PATH=${JAVA_HOME}/bin:$PATH

[root@rac02 soft]# source /etc/profile

4.測試

[root@rac01 ~]# java -version

java version "1.8.0_291"

Java(TM) SE Runtime Environment (build 1.8.0_291-b10)

Java HotSpot(TM) 64-Bit Server VM (build 25.291-b10, mixed mode)