pageUtil

public class PageUtil {

    public static List startPage(List list, Integer pageNum, Integer pageSize) {
        if (list == null) {
            return null;
        }
        if (list.size() == 0) {
            return new ArrayList();
        }
        int count = list.size(); // 记录总数
        int pageCount = 0; // 页数
        if (count % pageSize == 0) {
            pageCount = count / pageSize;
        } else {
            pageCount = count / pageSize + 1;
        }

        //当前页大于总页数
        if(pageNum > pageCount)
            return new ArrayList();

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

        if(fromIndex > list.size())
            return list;

        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;
    }
}