PageUtils

public class PageUtils {
    public static List startPage(List list, Integer pageNum, Integer pageSize) {
        if (list == null) {
            return Lists.newArrayList();
        }
        if (list.size() == 0) {
            return Lists.newArrayList();
        }
        //记录总数
        Integer count = list.size();
        //页数
        Integer pageCount = 0;
        if (count % pageSize == 0) {
            pageCount = count / pageSize;
        } else {
            pageCount = count / pageSize + 1;
        }
        //开始索引
        int fromIndex = 0;
        //结束索引
        int toIndex = 0;
        if (pageNum > pageCount) {
            pageNum = pageCount;
        }
        if (!pageNum.equals(pageCount)) {
            fromIndex = (pageNum - 1) * pageSize;
            toIndex = fromIndex + pageSize;
        } else {
            fromIndex = (pageNum - 1) * pageSize;
            toIndex = count;
        }
        List pageList = list.subList(fromIndex, toIndex);
        return pageList;
    }
}