Linux Ubuntu 下安装JDK、Tomcat、Maven

JDK

• How To Install Java on Ubuntu with Apt-Get

Tomcat

• How To Install Apache Tomcat 7 on Ubuntu 14.04 via Apt-Get

Maven

• 安装：How to install Maven 3 on Ubuntu 15.10/15.04/14.10/14.04 LTS/13.10/13.04/12.10/12.04 by using apt-get?
• 环境变量：How to permanently set environmental variables PATH and M2_HOME in ubuntu for maven3?