Apache Maven is a software project management and comprehension tool. Based on the concept of a project object model (POM), Maven can manage a project's build, reporting and documentation from a central piece of information.
Apache Maven是一个软件项目管理和理解工具。
基于项目对象模型（POM）的概念，Maven可以从一个中心信息管理项目的构建，报告和文档。
src
main
package
test
package
resource
<modelVersion>4.0.0</modelVersion>
<groupId>com.imooc.spark</groupId>
<artifactId>sql-spark2.1.0</artifactId>
<version>1.0</version>
mvn compile
mvn test
# 删除target
mvn clean
mvn package
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