基于struts2和hibernate的分页实现

在拜读了各位大牛的博客后，加以修改和添加总算是借鉴出了一个可行的分页实现。(●'◡'●)

话不多说，先贴两张效果图吧

接下来是实现代码：

pagingDAOImpl.java

public class pagingDAOImpl implements pagingDAO{

        public List<PagingTest> getPerPageList(String hql, int firstResult, int pageSize)
        {
            Session session = HibernateSessionFactory.getSession();
            Transaction tx = null;
            List<PagingTest> list = null;

            try
            {
                tx = session.beginTransaction();

                Query query = session.createQuery(hql).setFirstResult(firstResult).setMaxResults(pageSize);

                list = query.list();

                tx.commit();

            }
            catch (Exception e)
            {
                if(tx != null)
                {
                    tx.rollback();
                }

                e.printStackTrace();
            }
            finally
            {
                session.close();
            }

            return list;
        }

        @Override
        public int getTotalRows(String hql) {
             Session session = HibernateSessionFactory.getSession();
                Transaction tx = null;
                int totalRows = 0;
                try
                {
                    tx = session.beginTransaction();

                    Query query = session.createQuery(hql);

                    totalRows = query.list().size();

                    tx.commit();

                }
                catch (Exception e)
                {
                    if(tx != null)
                    {
                        tx.rollback();
                    }

                    e.printStackTrace();
                }
                finally
                {
                    session.close();
                }

                return totalRows;
        }
}

pagingServiceImpl.java

public class pagingServiceImpl implements pagingService {
       private pagingDAO pagingDAO = new pagingDAOImpl();

        /**
         * pageSize为每页显示的记录数
         * page为当前显示的网页
         */

        public PageBean getPageBean(int pageSize, int page)
        {
            PageBean pageBean = new PageBean();

            String hql = "from PagingTest";

            int totalRows = pagingDAO.getTotalRows(hql);

            int totalPage = pageBean.getTotalPages(pageSize, totalRows);

            int currentPage = pageBean.getCurPage(page);

            int firstResult = pageBean.getCurrentPageFirstResult(pageSize, currentPage);

            List<PagingTest> list = pagingDAO.getPerPageList(hql, firstResult, pageSize);

            pageBean.setList(list);
            pageBean.setTotalRows(totalRows);
            pageBean.setCurrentPage(currentPage);
            pageBean.setTotalPage(totalPage);

            return pageBean;
        }
}

PageBean.java

public class PageBean
{
    private List<PagingTest> list; //通过hql从数据库分页查询出来的list集合

    private int totalRows; //总记录数

    private int totalPage; //总页数

    private int currentPage; //当前页

    public List<PagingTest> getList()
    {
        return list;
    }

    public void setList(List<PagingTest> list)
    {
        this.list = list;
    }

    public int getTotalRows()
    {
        return totalRows;
    }

    public void setTotalRows(int totalRows)
    {
        this.totalRows = totalRows;
    }

    public int getTotalPage()
    {
        return totalPage;
    }

    public void setTotalPage(int totalPage)
    {
        this.totalPage = totalPage;
    }

    public int getCurrentPage()
    {
        return currentPage;
    }

    public void setCurrentPage(int currentPage)
    {
        this.currentPage = currentPage;
    }

    /**
     * 得到总页数
     * @param pageSize 每页记录数
     * @param totalRows  总记录数
     * @return 总页数
     */
    public int getTotalPages(int pageSize, int totalRows)
    {
        int totalPage = (totalRows % pageSize == 0)? (totalRows / pageSize): (totalRows / pageSize) + 1;

        return totalPage;
    }

    /**
     * 得到当前开始记录号
     * @param pageSize 每页记录数
     * @param currentPage 当前页
     * @return
     */
    public int getCurrentPageFirstResult(int pageSize, int currentPage)
    {
        int firstResult = pageSize * (currentPage - 1);

        return firstResult;
    }

    /**
     * 得到当前页， 如果为0 则开始第一页，否则为当前页
     * @param page
     * @return
     */
    public int getCurPage(int page)
    {
        int currentPage = (page == 0)? 1: page;

        return currentPage;
    }

}

PagingAction.java

public class PagingAction extends ActionSupport
    {
        private pagingService pagingService = new pagingServiceImpl();

        private int page;

        public int getPage()
        {
            return page;
        }

        public void setPage(int page)
        {
            this.page = page;
        }

        @Override
        public String execute() throws Exception
        {
            //表示每页显示5条记录，page表示当前网页
            PageBean pageBean = pagingService.getPageBean(5, page);

            ActionContext context=ActionContext.getContext();
            Map session=context.getSession();

            session.put("pageBean", pageBean);

            return SUCCESS;
        }
        public static void main(String[] args) {

        }
    }

以上就是功能实现的相关代码，至于dao，service，HibernateSessionFactory之类的文件就不贴上来了，上面的代码才是精华！