分页

@Data
public class PageResponseUtils<T> {
    private Page<T> page;

    public static <T> PageResponseUtils<T> create(List<T> result, int count, int pageNo, int pageSize) {
        PageResponseUtils<T> pageResponse = new PageResponseUtils<T>();
        Page<T> page = new Page<T>();
        page.setTotalCount(count);
        page.setPageNo(pageNo);
        page.setPageSize(pageSize);
        page.setResult((result == null) ? Collections.emptyList() : result);
        pageResponse.setPage(page);
        return pageResponse;
    }

    @Data
    public static class Page<T> {
        private int totalCount;
        private int pageNo;
        private int pageSize;
        private List<T> result;
    }

    public static boolean paging(Integer pageNum, Integer pageSize, int count) {
        if ((count % pageSize == 0 && pageNum > count / pageSize) || pageNum - 1 > count / pageSize) {
            return true;
        }
        return false;
    }
}

    @GetMapping("/home")
    public PageResponseUtils<SKeyMgt> keyHomePage(@RequestParam(required = false) String mgtDepart, @RequestParam(required = false) String str,
                                     @RequestParam(required = false, defaultValue = "0") Integer pageNum,
                                     @RequestParam(required = false, defaultValue = "0") Integer pageSize){

        PageHelper.startPage(pageNum, pageSize);
        List<SKeyMgt> keyMgtList = keyMgtService.getKeyHomePage(mgtDepart, str);
        Long total = new PageInfo<>(keyMgtList).getTotal();
        return PageResponseUtils.create(keyMgtList, total.intValue(), pageNum, pageSize);
    }