ubuntu 14.04 安装java8

1、下载JDK8

wget http://download.oracle.com/otn-pub/java/jdk/8u60-b27/jdk-8u60-linux-x64.tar.gz --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie"

2、安装配置

解压:

tar -zxvf jdk-8u5-linux-x64.tar.gz
mv jdk1.8.0_60 /usr/local/

配置：

修改/etc/profile
vim/etc/profile
文件内追加如下：
export JAVA_HOME=/usr/local/jdk1.8.0_60
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH
export CLASSPATH=$CLASSPATH:.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
执行命令

source /etc/profile
sudo update-alternatives  --install  /usr/bin/java java /usr/local/jdk1.8.0_60/bin/java 300
sudo update-alternatives  --install  /usr/bin/javac javac /usr/local/jdk1.8.0_60/bin/javac 300
sudo update-alternatives  --install  /usr/bin/jar jar /usr/local/jdk1.8.0_60/bin/jar 300
sudo update-alternatives  --install  /usr/bin/javah javah /usr/local/jdk1.8.0_60/bin/javah 300
sudo update-alternatives  --install  /usr/bin/javap javap /usr/local/jdk1.8.0_60/bin/javap 300