数据分配规则

业务会有一些场景是： 选中数据分配给对应业务人员

一下是写的一些代码

    /**
     * 分段截取
     * @param list   需要分割的集合
     * @param n      分成份数
     */
    public static <T> List<List<T>> splitList(List<T> list, int n) {
        int size = list.size();
        int remainder = size % n;
        int length = size / n;
        List<List<T>> result = new ArrayList<>();
        int index = 0;
        for (int i = 0; i < n; i++) {
            int endIndex = index + length + (remainder-- > 0 ? 1 : 0);
            result.add(list.subList(index, endIndex));
            index = endIndex;
        }
        return result;
    }

    /**
     *  将集合平均分配
     * @param list
     * @param n
     * @param assign
     * @return
     * @param <T>
     */
    public static <T> Map<String, List<T>> assignListToUsers(List<T> list, int n, List<String> assign) {
        Map<String, List<T>> result = new HashMap<>();
        List<List<T>> subLists = splitList(list, n);
        for (int i = 0; i < n; i++) {
            String user = assign.get(i);
            List<T> subList = subLists.get(i);
            result.put(user, subList);
        }
        return result;
    }

    /**
     * List 数据分配给 用户
     * @param data1
     * @param numUsers
     * @param assign
     * @return
     * @param <T>
     */
    public static <T> Map<String, List<T>> assignDataToUsers( List<T> data1, int numUsers, List<String> assign) {
        List<T> dataList = new ArrayList<>(data1);
        //数据结构  <assign,List(id)>
        Map<String, List<T>> result = new HashMap<>();
        //获取最小值
        int n = Math.min(numUsers, dataList.size());
        List<Integer> counts = new ArrayList<>(Collections.nCopies(n, dataList.size() / n));
        for (int i = 0; i < dataList.size() % n; i++) {
            counts.set(i, counts.get(i) + 1);
        }
        int startIndex = 0;
        for (int i = 0; i < n; i++) {
            String user = assign.get(i);
            int count = counts.get(i);
            List<T> subList = dataList.subList(startIndex, startIndex + count);
            startIndex += count;
            result.put(user, subList);
        }
        return result;
    }