手动对list进行分页（参数list ，当前页，页面大小）

/**
 * 对结果list进行分页的方法
 * @param list
 * @param pageNum
 * @param pageSize
 * @return
 */
public static IPage listToPage(List list, int pageNum, int pageSize){
    List pageList = new ArrayList<>();
    int curIdx = pageNum > 1 ? (pageNum - 1) * pageSize : 0;
    for (int i = 0; i < pageSize && curIdx + i < list.size(); i++) {
        pageList.add(list.get(curIdx + i));
    }
    IPage page = new Page<>(pageNum, pageSize);
    page.setRecords(pageList);
    page.setTotal(list.size());
    return page;
}

@Override
public IPage<AllGamePlatformByMonth> getList(Page startPage, AllGamePlatformByMonth allGamePlatformByMonth) {

    List<AllGamePlatformByMonth> resultList = allGamePlatformByMonthService.getAllGamePlatformByMonthList(allGamePlatformByMonth);
    IPage <AllGamePlatformByMonth> iPage = listToPage(resultList, (int) startPage.getCurrent(), (int) startPage.getSize());
    return iPage;
}