hibernate +Struts2实现分页

action中

 @SuppressWarnings({ "unchecked", "rawtypes" })
    public String selectList(){
        Map<String,Object> request = (Map<String, Object>) ActionContext.getContext().get("request");
        try{
            Map<String,Object> session = ActionContext.getContext().getSession();
            List list = newsBiz.selectByPage("News", 1, 3);
            int totalPage = newsBiz.getTotal("News");
            request.put("list", list);
            double tatalPages=totalPage/3.0;
            int totalPage1=(int)Math.ceil(tatalPages);//向上取整  总页数
            request.put("totalPage", totalPage1);
            request.put("currentPage", 1)；
        }catch(Exception e){
            e.printStackTrace();
        }
        return "selectList";
    }

/**
 * 分页查找下一页
 * @return
 */
@SuppressWarnings("rawtypes")
public String selectNextPage(){
    HttpServletRequest request = ServletActionContext.getRequest();
    Map<String,Object> map = (Map<String, Object>) ActionContext.getContext().get("request");
    int next = Integer.parseInt(request.getParameter("page"));
    try{
        List list = newsBiz.selectByPage("News", next, 3);
        int totalPage = newsBiz.getTotal("News");
        map.put("list", list);
        double tatalPages=totalPage/3.0;
        int totalPage1=(int)Math.ceil(tatalPages);
        map.put("totalPage", totalPage1);
        map.put("currentPage", next);
    }catch(Exception e){
        e.printStackTrace();
    }
    return "selectnextList";
}

dao层实现类

  @Override
    public List<News> selectByPage(String className, int pageNo, int pageSize) {
        Query query = this.getSession().createQuery("from "+ className);
        query.setFirstResult((pageNo - 1) * pageSize);//从哪个地方开始查询
        query.setMaxResults(pageSize);//每页显示的记录数
        return query.list();
    }

页面jsp

function show(next,total){
   if (next<=0) {
      alert("已经是首页了");
      return;
   }
   if (next>total) {
      alert("已经是尾页了");
      return;
   }
   document.forms[0].action="newsselectNextPage?page="+next;
   document.forms[0].submit();
}

 <div> 
           第${currentPage }页
        <input type="hidden" id="tpage" name="tpage"
         value="${totalPage} "></input>
        <c:if test="${currentPage>1 }">
        <input type="button" value="首页" onclick="show(1)"></input>
        <input type="button" value="上一页" onclick="show(${currentPage-1})"></input>
        </c:if>
        <c:if test="${currentPage<totalPage }">
        <input type="button" value="下一页" onclick="show(${currentPage+1},${totalPage })"></input>
        <input type="button" value="尾页" onclick="show(${totalPage})"></input>
        </c:if>
        共${totalPage }页  
    </div>