Linux 下JDK 安装

首先去oracle官网下载安装包

http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

解压下载的安装（一般情况我默认/usr/local/下放安装程序，/usr/local/src下放安装包）

[[email protected] src]#tar -zxvf jdk-8u51-linux-x64.gz

[[email protected] src]# mv jdk1.8.0_51/ /usr/local/

设置环境变量

方法1：创建属于jdk自己的变量

[[email protected] jdk1.8.0_51]# vi /etc/profile.d/java.sh

JAVA_HOME=/usr/local/jdk1.8.0_51

JAVA_BIN=/usr/local/jdk1.8.0_51/bin

JRE_HOME=/usr/local/jdk1.8.0_51/jre

CLASSPATH=.

PATH=$PATH:/usr/local/jdk1.8.0_51/bin:/usr/local/jdk1.8.0_51/jre/bin

CLASSPATH=//usr/local/jdk1.8.0_51/jre/lib:/usr/local/jdk1.8.0_51/lib:/usr/local/jdk1.8.0_51/jre/lib/charsets.jar

[[email protected] jdk1.8.0_51]# . /etc/profile.d/java.sh

查看安装是否成功

[[email protected] jdk1.8.0_51]# java -version

java version "1.8.0_51"

Java(TM) SE Runtime Environment (build 1.8.0_51-b16)

Java HotSpot(TM) 64-Bit Server VM (build 25.51-b03, mixed mode)

方法2：在全局变量下面添加

[[email protected] jdk1.8.0_51]# vi /etc/profile

export JAVA_HOME=/use/java/usr/java/jdk1.8.0_51
export JRE_HOME=/usr/java/jdk1.8.0_51/jre
export CLASSPATH=.:$JAVA_HOME/bin:%JRE_HOME/lib:%CLASSPAT
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH