CShop Project 082: 获取分页数据模型并传递到页面上

1.　　GoodsListServlet.Java

    　　 int pageNo = 0;
        if(request.getParameter("pageNo") != null) {
            pageNo = Integer.parseInt(request.getParameter("pageNo"));
        }

          List<Goods> list = gService.selectGoods(id, pageNo, 8); // 显示第pageNo页, 1页最多显示8条数据
          request.setAttribute("list", list);

2.　　GoodsDao.java

public int getGoodsCount(int typeId) throws SQLException {
        QueryRunner r = new QueryRunner(DBUtil.getDataSource());
        String sql="";
        if(typeId == 0) {
            sql = "select count(*) from goods ";
        }else {
            sql = "select count(*) from goods where type_id = ?  ";
        }
        return r.query(sql, new ScalarHandler<Long>()).intValue();    
    }

3.　　GoodsService.java

    
    public Page getGoodsPage(int typeId, int pageNo) {
        
        // 获得pageNo
        Page p = new Page();
        p.setPageNumber(pageNo);
        
        // 获得总页数
        int totalCount = 0;
        try {
            totalCount = gDao.getGoodsCount(typeId);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        p.setPageSizeAndTotalCount(8, totalCount);
        
        // 获得对应页的商品数据
        List list = null;
        try {
            list = gDao.selectGoods(typeId, pageNo, 8);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        p.setList(list);
        
        
        return p;        
    }

4.　　GoodsListServlet.java

//        List<Goods> list = gService.selectGoods(id, pageNo, 8);    // 显示第pageNo页, 1页最多显示8条数据
//        request.setAttribute("list", list);
        
　　　　  // 修改为传递分页数据模型:  
        Page p = gService.getGoodsPage(id, pageNo);
        request.setAttribute("p", p);