下载过程

将已销售商品的信息，按照商品销量从高到低排序后，通过响应输出流送到浏览器，再保存到本地磁盘的扩展名为“.csv”的文件中。

创建下载页面

<form id="Form1" name="Form1" action="${pageContext.request.contextPath}/download" method="post">                  <table cellSpacing="1" cellPadding="0" width="100%" align="center" bgColor="#f5fafe" border="0">               <tbody>                                                                                                    <tr>                                                                                                   <td class="ta_01" align="center" bgColor="#afd1f3">                                                <strong>查 询 条 件</strong>                                                                       </td>                                                                                              </tr>                                                                                                  <tr>                                                                                                   <td>                                                                                               <table cellpadding="0" cellspacing="0" border="0" width="100%">                                <tr>                                                                                       <td height="22" align="center" bgColor="#f5fafe" class="ta_01">                        请输入年份                                                                              </td>                                                                                  <td class="ta_01" bgColor="#ffffff">                                                   <input type="text" name="year" size="15" value="" id="Form1_userName" class="bg" /></td>                                                                                  <td height="22" align="center" bgColor="#f5fafe" class="ta_01">                        请选择月份                                                                              </td>                                                                                  <td class="ta_01" bgColor="#ffffff">                                                   <select name="month" id="month">                                                   <option value="0">--选择月份--</option>                                            <option value="1">一月</option>                                                  <option value="2">二月</option>                                                  <option value="3">三月</option>                                                  <option value="4">四月</option>                                                  <option value="5">五月</option>                                                  <option value="6">六月</option>                                                  <option value="7">七月</option>                                                  <option value="8">八月</option>                                                  <option value="9">九月</option>                                                  <option value="10">十月</option>                                                 <option value="11">十一月</option>                                                <option value="12">十二月</option>                                                </select>                                                                          </td>                                                                                  </tr>                                                                                      <tr>                                                                                       <td width="100" height="22" align="center" bgColor="#f5fafe" class="ta_01">            </td>                                                                                  <td class="ta_01" bgColor="#ffffff">                                                   <font face="宋体" color="red"> &nbsp;</font>                                         </td>                                                                                  <td align="right" bgColor="#ffffff" class="ta_01">                                     <br /><br />                                                                       </td>                                                                                  <td align="center" bgColor="#ffffff" class="ta_01">                                    <input type="submit" id="search" name="search" value="下载" class="button_view">     &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;                                                 <input type="reset" name="reset" value="重置" class="button_view" />                 </td>                                                                                  </tr>                                                                                      </table>                                                                                       </td>                                                                                              </tr>                                                                                                  </tbody>                                                                                                   </table>
</form>

创建Servlet

public class DownloadServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String year = request.getParameter("year");String month = request.getParameter("month");ProductService service = new ProductService();List<Object[]> ps = service.download(year,month);String fileName=year+"年"+month+"月销售榜单.csv"; response.setContentType(this.getServletContext().getMimeType(fileName));response.setHeader("Content-Disposition", "attachement;filename="+new String(fileName.getBytes("GBK"),"iso8859-1"));      response.setCharacterEncoding("gbk");     PrintWriter out = response.getWriter();out.println("商品名称,销售数量");for (int i = 0; i < ps.size(); i++) {Object[] arr=ps.get(i);out.println(arr[0]+","+arr[1]);           }out.flush();out.close();}
}

编写Service层代码

// 下载销售榜单public List<Object[]> download(String year, String month) {List<Object[]> salesList = null;try {salesList = dao.salesList(year, month);} catch (SQLException e) {e.printStackTrace();}return salesList;}

编写DAO层的代码

// 销售榜单
public List<Object[]> salesList(String year, String month)                throws SQLException {                                             String sql = "SELECT products.name,SUM(orderitem.buynum) totalsalnum "+ "FROM orders,products,orderItem "                           + "WHERE orders.id=orderItem.order_id "                       + "AND products.id=orderItem.product_id "                     + "AND orders.paystate=1 "                                    + "and year(ordertime)=? "                                    + "and month(ordertime)=? "                                   + "GROUP BY products.name "                                   + "ORDER BY totalsalnum DESC";                                QueryRunner runner = new QueryRunner(DataSourceUtils.getDataSource());return runner.query(sql, new ArrayListHandler(), year, month);
}

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实现销售榜单下载功能

下载过程

创建下载页面

创建Servlet

编写Service层代码

编写DAO层的代码

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