阿里云Ubuntu 16.04使用apt-get来安装Java和Tomcat

更新一下Ubuntu安装源：

sudo apt-get update

安装Java

sudo apt-get install default-jre
# 运行java-version

# openjdk version "11.0.10" 2021-01-19
# OpenJDK Runtime Environment (build 11.0.10+9-Ubuntu-0ubuntu1.18.04)
# OpenJDK 64-Bit Server VM (build 11.0.10+9-Ubuntu-0ubuntu1.18.04, mixed mode, sharing)

sudo apt-get install default-jdk
sudo add-apt-repository ppa:webupd8team/java

JDK 8 9 11, 任选一个安装

sudo apt-get install oracle-java8-installer # JDK 8
sudo apt-get install oracle-java9-installer # JDK 9
sudo apt-get install oracle-java11-installer # JDK 11

安装tomcat7

sudo apt-get install tomcat7