ubuntu 14.04 配置java 1.8环境变量

从官网上下载jdk 源文件，并解压

root@hett-PowerEdge-T30:/usr/local/src# tar -xzvf jdk-8u151-linux-x64.tar.gz

解压完成之后进入环境变量，配置环境变量
root@hett-PowerEdge-T30:/usr/local/src# nano /etc/profile

export JAVA_HOME=/usr/local/src/jdk1.8.0_151
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

root@hett-PowerEdge-T30:/usr/local/src# source /etc/profile

配置环境变量之后，验证是否安装成功
root@hett-PowerEdge-T30:/usr/local/src# java -version
java version "1.8.0_151"
Java(TM) SE Runtime Environment (build 1.8.0_151-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.151-b12, mixed mode)
root@hett-PowerEdge-T30:/usr/local/src#