java web将数据导出为pdf格式文件代码片段

function getVerPdf() {
 window.open('/pms/jsp/version/getPrdVerListPdf?page='
   + $("#getPage").html() + '&key=' + $("#select").val());
}

/**
  * 
  * Purpose :将产品版本列表导出为pdf格式
  * 
  * @param req
  *   请求
  * @param resp
  *   应答
  * @param page
  *   当前页数
  */
 @RequestMapping(value = "getPrdVerListPdf")
 public void getPrdTypeList(HttpServletRequest req,HttpServletResponse resp,Integer page,String key) {
  resp.setContentType("application/pdf");
  // 弹框选择保存路径和文件名
  // resp.setHeader("content-disposition",// "attachment;filename=PrdVerList.pdf");

  // 得到当前页的数据
  List<Version> verList = prdVersionSer.getAllPrdVersion(key);
  if (verList.size() == 0) {
   // 如果没有数据，则返回主界面并显示提示消息
   req.setAttribute("getFileMsg","没有符合条件的信息！");
   req.setAttribute("select",key);
   try {
    req.getRequestDispatcher("/jsp/version/ver_list.jsp").forward(req,resp);
   } catch (Exception e) {
    e.printStackTrace();
   }
  } else {
   // 如果有数据，则显示pdf文件
   JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(verList);
   String reportPath = null;
   Map<String,Object> map = new HashMap<String,Object>();
   if (key != "") {
    map.put("prdName",verList.get(0).getPrdName());
   } else {
    map.put("prdName","");
   }
   reportPath = req.getServletContext().getRealPath("/reports/prdVerListByPrdName.jasper");
   InputStream is = null;

   try {
    is = new FileInputStream(reportPath);
    JasperRunManager.runReportToPdfStream(is,resp.getOutputStream(),map,ds);
   } catch (Exception e) {
    e.printStackTrace();
   } finally {
    if (is != null) {
     try {
      is.close();
     } catch (IOException e) {
      e.printStackTrace();
     }
    }
   }
  }
 }