2020-09-09 List分页Util

 /**
     * list 分页工具类
     * @param pageIndex
     * @param pageSize
     * @param list
     * @return
     */
    private static List Pager( int pageIndex, int pageSize, List list) {
        //使用list 中的sublist方法分页
        List<T> dataList = null;
        // 每页显示多少条记录

        int currentPage; //当前第几页数据

        int totalRecord = list.size(); // 一共多少条记录

        int totalPage = totalRecord % pageSize; // 一共多少页
        if (totalPage > 0) {
            totalPage = totalRecord / pageSize + 1;
        } else {
            totalPage = totalRecord / pageSize;
        }

        System.out.println("总页数:" + totalPage);

        // 当前第几页数据
        currentPage = totalPage < pageIndex ? totalPage : pageIndex;

        // 起始索引
        int fromIndex = pageSize * (currentPage - 1);

        // 结束索引
        int toIndex = pageSize * currentPage > totalRecord ? totalRecord : pageSize * currentPage;
        try {
            dataList = list.subList(fromIndex, toIndex);
        } catch (IndexOutOfBoundsException e) {
            e.printStackTrace();
        }
        return dataList;
    }