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http://www.oracle.com/technetwork/cn/java/javase/downloads/jdk8-downloads-2133151-zhs.html
2 以root用户登录将下载的jdk-8u92-linux-x64.tar.gz文件放到/temp目录下，使用如下命令解压
tar zxvf jdk-8u92-linux-x64.tar.gz
3 将解压后的jdk1.8.0_92复制到/opt下，命令如下：
root@test:~# mkdir /temp
root@test:~# cd /temp
root@test:/temp# tar zxvf jdk-8u92-linux-x64.tar.gz
root@test:/temp# cd /opt
root@test:/opt# mv /temp/jdk1.8.0_92/ .
root@test:/opt# ls -l
总用量 4
drwxr-xr-x 8 uucp 143 4096 4月 1 12:20 jdk1.8.0_92
4 在/bin目录下创建java软链接
root@test:/opt# cd /bin
root@test:/bin# ln -s /opt/jdk1.8.0_92/bin/java java
验证软件接的正确性
root@test:/bin# java -version
java version "1.8.0_92"
Java(TM) SE Runtime Environment (build 1.8.0_92-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.92-b14, mixed mode)
5 设置Java环境
root@test:/bin# gedit /etc/profile
export JAVA_HOME=/opt/jdk1.8.0_92
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH={JAVA_HOME}/bin:$PATH
root@test:/bin# source /etc/profile
root@test:/bin# echo $JAVA_HOME
/opt/java1.8.0_92
6 切换到其它用户验证
ccskun@test:~$ echo $JAVA_HOME /opt/jdk1.8.0_92 ccskun@test:~$ java -version java version "1.8.0_92" Java(TM) SE Runtime Environment (build 1.8.0_92-b14) Java HotSpot(TM) 64-Bit Server VM (build 25.92-b14, mixed mode)
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原文地址：http://www.cnblogs.com/liangml/p/5969007.html
