centos7安装jdk8

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1. jdk8下载

jdk8下载地址：

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

wget命令下载：

# wget -c http://download.oracle.com/otn-pub/java/jdk/8u121-b13/e9e7ea248e2c4826b92b3f075a80e441/jdk-8u121-linux-x64.tar.gz?AuthParam=1491540543_f8a8fe404dfcf8124978281e88e1b52e

文件重命名得到jdk-8u121-linux-x64.tar.gz:

# mv jdk-8u121-linux-x64.tar.gz\?AuthParam\=1491540543_f8a8fe404dfcf8124978281e88e1b52e jdk-8u121-linux-x64.tar.gz

2. 解压缩

解压jdk-8u121-linux-x64.tar.gz得到目录jdk1.8.0_121:

# tar -xzvf jdk-8u121-linux-x64.tar.gz

3. 指定jdk的安装目录

创建目录/usr/java/

# cd /usr/# mkdir java

移动目录jdk1.8.0_121到/usr/java/下：

# mv jdk1.8.0_121/ /usr/java/# cd /usr/java/# lsjdk1.8.0_121

4. 配置环境变量

修改文件/etc/profile

# vim /etc/profile

在/etc/profile文件内容最后追加:

export JAVA_HOME=/usr/java/jdk1.8.0_121export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jarexport PATH=$PATH:$JAVA_HOME/bin

:wq保存退出
使文件/etc/profile重新生效

# source /etc/profile

5. 检测jdk8是否成功安装

# java -versionjava version "1.8.0_121"Java(TM) SE Runtime Environment (build 1.8.0_121-b13)Java HotSpot(TM) 64-Bit Server VM (build 25.121-b13, mixed mode)#

Ok， Enjoy it~

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