一、添加pagehelper依赖

<!--添加分页相关依赖-->
<dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper-spring-boot-starter</artifactId>
    <version>1.2.13</version>
</dependency>

二、使用方式

@Override
public PageInfo listForAdmin(Integer pageNum,Integer pageSize){
    PageHelper.startPage(pageNum,pageSize,"type,order_num");
    List<Category> categoryList = categoryMapper.selectList();
    PageInfo pageInfo = new PageInfo(categoryList);
    return pageInfo;

}