导入依赖
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>4.1.6</version>
</dependency>
https://blog.csdn.net/qq_21996541/article/details/79796117
原文：https://www.cnblogs.com/cjh-code/p/11845008.html