Maven项目打包方式的选择

1.jar：默认的打包方式

2.pom：一般作为父工程或者聚合工程的打包方式，用来定义依赖的版本，或者添加某些公用的依赖。

官方文档：POM Reference

The packaging type required to be pom for parent and aggregation (multi-module) projects. These types define the goals bound to a set of lifecycle stages. For example, if packaging is jar, then the package phase will execute the jar:jar goal. Now we may add values to the parent POM, which will be inherited by its children. Most elements from the parent POM are inherited by its children

3.war：在tomcat容器中运行需要达成war包（springboot tomcat插件可以达成jar包）。