1. 下载

1.1 安装wget

yum install -y wget

1.2 下载JDK

wget "http://download.oracle.com/otn-pub/java/jdk/8u20-b26/jdk-8u20-linux-x64.tar.gz"

2. 解压

tar -zxf jdk-8u20-linux-x64.tar.gz

3. 配置环境变量

echo "JAVA_HOME=/usr/java/jdk1.8.0_20" > /etc/profile.d/java.sh  
echo '\$JAVA_HOME/bin:$PATH' >> /etc/profile.d/java.sh  
echo 'export JAVA_HOME PATH' >> /etc/profile.d/java.sh