引入依赖

<dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper-spring-boot-starter</artifactId>
    <version>1.2.12</version>
</dependency>

application.properties配置

# pagehelper分页插件配置
pagehelper.helper-dialect=mysql
pagehelper.support-methods-arguments=true

Controller层

  @GetMapping("list")
  public ApiResult<PagedData> getSiteListNotDeleteByTagId(@RequestParam("tagId") Integer tagId,
                                                          @RequestParam("pageNum") Integer pageNum,
                                                          @RequestParam("pageSize") Integer pageSize) {
      PagedData pagedData = siteService.getSiteListNotDeleteByTagId(tagId, pageNum, pageSize);
      return ApiResult.success(pagedData);
  }

Service层

@Override
public PagedData getSiteListNotDeleteByTagId(Integer tagId, Integer pageNum, Integer pageSize) {
    Example example = new Example(Site.class);
    criteria.andEqualTo("tagid", tagId);
    /*第一步：PageHelper.startPage必须放在最前面，只针对最近的一次查询*/
    PageHelper.startPage(pageNum, pageSize);
    /*第二步：获取数据*/
    List<Site> siteList = siteMapper.selectByExample(example);
    /*第三步：返回封装的分页数据*/
    return PageUtil.getPagedData(siteList);
}

分页数据工具类

public class PageUtil {
    public static PagedData getPagedData(List<?> list) {
        PageInfo<?> pageInfo = new PageInfo<>(list);
        PagedData pageData = new PagedData();
        pageData.setPageNum(pageInfo.getPageNum());
        pageData.setPageSize(pageInfo.getPageSize());
        pageData.setPages(pageInfo.getPages());
        pageData.setTotal(pageInfo.getTotal());
        pageData.setPageList(pageInfo.getList());
        return pageData;
    }
}