1、OracleJDK的下载地址
http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

2、找到你要下载的jdk版本，右键赋值URL地址

3、wget下载

在 wget 后面拼接  
--no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" 
再拼接 你的URL

比如：

wget –no-check-certificate –no-cookies –header “Cookie: oraclelicense=accept-securebackup-cookie” http://download.oracle.com/otn-pub/java/jdk/8u121-b13/e9e7ea248e2c4826b92b3f075a80e441/jdk-8u121-linux-x64.tar.gz