list分页-java

    public class PageUtil {

        /**
         * 开始分页
         * @param list
         * @param pageNum 页码
         * @param pageSize 每页多少条数据
         * @return
         */
        public static List startPage(List list, Integer pageNum,
                Integer pageSize) {
            if (list == null) {
                return null;
            }
            if (list.size() == 0) {
                return null;
            }

            Integer count = list.size(); // 记录总数
            Integer pageCount = 0; // 页数
            if (count % pageSize == 0) {
                pageCount = count / pageSize;
            } else {
                pageCount = count / pageSize + 1;
            }

            int fromIndex = 0; // 开始索引
            int toIndex = 0; // 结束索引

            if (pageNum != pageCount) {
                fromIndex = (pageNum - 1) * pageSize;
                toIndex = fromIndex + pageSize;
            } else {
                fromIndex = (pageNum - 1) * pageSize;
                toIndex = count;
            }

            List pageList = list.subList(fromIndex, toIndex);

            return pageList;
        }
    }

list集合使用分页