POI通过读取Excel模板生成Excel文件

Java代码  

 /**
      * 导出
      * @param mapping
      * @param form
      * @param request
      * @param response
      * @return
      */
     public ActionForward export(ActionMapping mapping, ActionForm form,
             HttpServletRequest request, HttpServletResponse response) {

         String checkBoxValueList = request.getParameter("ckv");
         if(!CommonUtil.isNotNullorEmtry(checkBoxValueList)) {
             this.saveMessages(request, "export.fail");
             return mapping.findForward("export.fail");
         }
         List listOrder = orderService.exportOrderList(checkBoxValueList);

         try {
 //          SimpleDateFormat sf = new SimpleDateFormat("yyyyMMddhhmm");
 //          Calendar calendar = Calendar.getInstance();

             ServletOutputStream os = response.getOutputStream(); //获得输出流
             response.reset();   //清空输出流
             String fileName = new String("订单列表".getBytes("gb2312"), "ISO8859-1") +".xls";
             response.setHeader("Content-disposition", "attachment; filename="+ fileName); //设定输出文件头
             response.setContentType("application/msexcel"); //定义输出类型

             String filePath = request.getSession().getServletContext().getRealPath("/excel/model/order.xls");

             HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(filePath));    //读取excel模板
             try {
                 HSSFSheet sheet = workbook.getSheetAt(0);   //读取第一个工作簿
                 HSSFRow row;
                 HSSFCell cell = null;
                 int rownum = 3; //添加的起始行
                 HSSFCellStyle style = this.getStyle(workbook);
                 Iterator it = listOrder.iterator();
                 Order order = null;

                 while(it.hasNext()) {
                     order = new Order();
                     order = it.next();

                     row = sheet.createRow(rownum);

                     myCreateCell(1, String.valueOf(rownum-2), row, cell, style);    //列1
                     myCreateCell(2, order.getAdName(), row, cell, style);   //列2
                     myCreateCell(3, order.getSmallAreaName(), row, cell, style);    //列1

                     rownum++;
                 }

                 workbook.write(os);
                 os.flush();
                 os.close();
             } catch (Exception e) {
                 e.printStackTrace();
             }
         } catch (IOException e) {
             e.printStackTrace();
         }
         return null;
     }

     private void myCreateCell(int cellnum, String value, HSSFRow row, HSSFCell cell, HSSFCellStyle style) {
         cell = row.createCell((short) cellnum);
         cell.setCellValue(new HSSFRichTextString(value));
         cell.setCellStyle(style);
     }

     public HSSFCellStyle getStyle(HSSFWorkbook workbook) {
         //设置字体;
         HSSFFont font = workbook.createFont();
         //设置字体大小;
         font.setFontHeightInPoints((short) 5);
         //设置字体名字;
         font.setFontName("Courier New");
         //font.setItalic(true);
         //font.setStrikeout(true);
         //设置样式;
         HSSFCellStyle style = workbook.createCellStyle();
         //设置底边框;
         style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
         //设置底边框颜色;
         style.setBottomBorderColor(HSSFColor.BLACK.index);
         //设置左边框;
         style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
         //设置左边框颜色;
         style.setLeftBorderColor(HSSFColor.BLACK.index);
         //设置右边框;
         style.setBorderRight(HSSFCellStyle.BORDER_THIN);
         //设置右边框颜色;
         style.setRightBorderColor(HSSFColor.BLACK.index);
         //设置顶边框;
         style.setBorderTop(HSSFCellStyle.BORDER_THIN);
         //设置顶边框颜色;
         style.setTopBorderColor(HSSFColor.BLACK.index);
         //在样式用应用设置的字体;
         style.setFont(font);
         //设置自动换行;
         style.setWrapText(false);
         //设置水平对齐的样式为居中对齐;
         style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
         //设置垂直对齐的样式为居中对齐;
         style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
         return style;
     }