POM配置文件--properties标签的使用
<project>
...
<properties>
<>1.8</>
<>8.0.21</>
</properties>
<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${}</version>
</dependency>
</dependencies>
...
</project>