POI通過讀取Excel模板生成Excel文件

Java代碼  

/**
     * 導出
     * @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<Order> listOrder = orderService.exportOrderList(checkBoxValueList);

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

            ServletOutputStream os = response.getOutputStream(); //獲得輸出流
            response.reset();   //清空輸出流
            String fileName = new String("訂單列表".getBytes("gb2312"), "ISO8859-1") +".xls";
            response.setHeader("Content-disposition", "attachment; filename="+ fileName); //設定輸出文件頭
            response.setContentType("application/msexcel"); //定義輸出類型

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

            HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(filePath));    //讀取excel模板
            try {
                HSSFSheet sheet = workbook.getSheetAt(0);   //讀取第一個工作簿
                HSSFRow row;
                HSSFCell cell = null;
                int rownum = 3; //添加的起始行
                HSSFCellStyle style = this.getStyle(workbook);
                Iterator<Order> 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) {
        //設置字體;
        HSSFFont font = workbook.createFont();
        //設置字體大小;
        font.setFontHeightInPoints((short) 5);
        //設置字體名字;
        font.setFontName("Courier New");
        //font.setItalic(true);
        //font.setStrikeout(true);
        //設置樣式;
        HSSFCellStyle style = workbook.createCellStyle();
        //設置底邊框;
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        //設置底邊框顏色;
        style.setBottomBorderColor(HSSFColor.BLACK.index);
        //設置左邊框;
        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        //設置左邊框顏色;
        style.setLeftBorderColor(HSSFColor.BLACK.index);
        //設置右邊框;
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);
        //設置右邊框顏色;
        style.setRightBorderColor(HSSFColor.BLACK.index);
        //設置頂邊框;
        style.setBorderTop(HSSFCellStyle.BORDER_THIN);
        //設置頂邊框顏色;
        style.setTopBorderColor(HSSFColor.BLACK.index);
        //在樣式用應用設置的字體;
        style.setFont(font);
        //設置自動換行;
        style.setWrapText(false);
        //設置水平對齊的樣式爲居中對齊;
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        //設置垂直對齊的樣式爲居中對齊;
        style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
        return style;
    }