java内存分页

内存分页

/**
     * @Description 将指定的list集合转换为指定的分页数据
     * @Author wlh
     * @param list
     * @return
     */
    public static <T> IPage<T> getPageList(IPage<T> pageInfo, List<T> list){
        // IPage<T> pageInfo = new Page<>(page.getPages(), page.getSize());
        int currPage = (int)pageInfo.getCurrent() == 0 ? 1 : (int)pageInfo.getCurrent();
        int pageSize = (int)pageInfo.getSize();
        // 从第几条数据开始
        int firstIndex = (currPage - 1) * pageSize;
        // 到第几条数据结束
        int lastIndex = Math.min(list.size(), currPage * pageSize);
        if(CollectionUtils.isEmpty(list)){
            pageInfo.setTotal(0);
            pageInfo.setRecords(Collections.emptyList());
        }else{
            List<T> recordists = list.subList(firstIndex, lastIndex);
            pageInfo.setTotal(list.size());
            pageInfo.setRecords(recordists);
        }
        return pageInfo;
    }