/**

     * 按指定大小，分隔集合，将集合按规定个数分为n个部分

     *

     * @param list

     * @param len

     * @return

     */

    public static <T> List<List<T>> splitList(List<T> list, int len) {

        if (list == null || list.size() == 0 || len < 1) {

            return null;

        }

        List<List<T>> result = new ArrayList<List<T>>();

        int size = list.size();

        int count = (size + len - 1) / len;

        for (int i = 0; i < count; i++) {

            List<T> subList = list.subList(i * len, ((i + 1) * len > size ? size : len * (i + 1)));

            result.add(subList);

        }

        return result;

    }