List集合Stream流转PageInfo或Page分页

需要参数：
1.PageNum当前页码；
2.PageSize每页条数；
3.dataList数据集合;
代码如下：

 List<Map<String, Object>> finalList = dataList.stream()
                .skip((pageIndex - 1) * pageSize)
                .limit(pageSize)
                .collect(Collectors.toList());
 //构建PageInfo对象
 PageInfo<Map<String, Object>> pageInfo = new PageInfo<>(finalList2);
        pageInfo.setTotal(dataList.size());
        pageInfo.setPageSize(pageSize);
        pageInfo.setPageNum(pageIndex);
 //根据自己前端的需要再set例如HasNextPage之类的参数
 //或利用后续工具类
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优点在于可以同时保留原集合和分页集合，分页集合用于页面查询，原集合用于导出。

public static <T> PageInfo<T> list2PageInfo(List<T> list ,Integer pageNum, Integer pageSize) {
        //java8 stream实现list分页
        List<T> pageList = list.stream().sorted().skip((pageNum - 1) * pageSize)
                .limit(pageSize)
                .collect(Collectors.toList());
        PageInfo<T> pageInfo = new PageInfo<T>(pageList);
        pageInfo.setTotal(list.size());
        int endRow = pageInfo.getEndRow() == 0 ? 0 : (pageNum - 1) * pageSize + pageInfo.getEndRow() + 1;
        pageInfo.setEndRow(endRow);
        boolean hasNextPage = list.size() <= pageSize * pageNum ? false : true;
        pageInfo.setHasNextPage(hasNextPage);
        boolean hasPreviousPage = pageNum == 1 ? false : true;
        pageInfo.setHasPreviousPage(hasPreviousPage);
        pageInfo.setIsFirstPage(!hasPreviousPage);
        boolean isLastPage = (list.size() > pageSize * (pageNum - 1) && list.size() <= pageSize * pageNum) ? true : false;
        pageInfo.setIsLastPage(isLastPage);
        int pages = list.size() % pageSize == 0 ? list.size() / pageSize : (list.size() / pageSize) + 1;
        pageInfo.setNavigateLastPage(pages);
        int[] navigatePageNums = new int[pages];
        for (int i = 1; i < pages; i++) {
            navigatePageNums[i - 1] = i;
        }
        pageInfo.setNavigatepageNums(navigatePageNums);
        int nextPage = pageNum < pages ? pageNum + 1 : 0;
        pageInfo.setNextPage(nextPage);
        pageInfo.setPageNum(pageNum);
        pageInfo.setPageSize(pageSize);
        pageInfo.setPages(pages);
        pageInfo.setPrePage(pageNum - 1);
        pageInfo.setSize(pageInfo.getList().size());
        int starRow = list.size() < pageSize * pageNum ? 1 + pageSize * (pageNum - 1) : 0;
        pageInfo.setStartRow(starRow);
        return pageInfo;
    }
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