subList截图数据集合，便于分页或分批次保存至数据库

import java.util.ArrayList;
import java.util.List;

public class subList {

    /**
     * @param list 待切割集合
     * @param len 集合按照多大size来切割
     * @param <T>
     * @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<>();
        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;
    }
}


//示例 - 保存数据集
List<List<DataRsvrssss>> listRsvrData = subList.splitList(dataRsvrsssses, 1000);
for (int i = 0; i < listRsvrData.size(); i++) {
  //分配此保存数据
 dao.insertOrUpdateRsvrData(listRsvrData.get(i));
}