java后台动态生成导出excel

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ublic void export(List<WechatUser> wechatUserList, HttpServletResponse response) throws IOException, URISyntaxException {
    File newFile = createNewFile(getClass().getClassLoader().getResource("../../resources/excel/wechatUserInfoTemplate.xls").toURI().getPath(),  new URI("../../resources/xls").getPath());//防止路径中的空格转义为%20

    InputStream is = null;
    HSSFWorkbook workbook = null;
    HSSFSheet sheet = null;

    try {
        is = new FileInputStream(newFile);// 将excel文件转为输入流
        workbook = new HSSFWorkbook(is);// 创建个workbook，
        sheet = workbook.getSheetAt(0);
    } catch (Exception e1) {
        e1.printStackTrace();
    }

    if (sheet != null) {
        try {
            // 写数据
            FileOutputStream fos = new FileOutputStream(newFile);
            HSSFRow row = sheet.createRow(1);
            HSSFCell cell = row.createCell(0);
            HSSFCellStyle style = workbook.createCellStyle();
            style.setAlignment(CellStyle.ALIGN_CENTER);
            style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
            style.setWrapText(true);
            int i = 1;
            for (WechatUser wechatUser : wechatUserList) {
                List<Children> childrenList = wechatUser.getChildrenList();
                int size = childrenList.size();

                row = sheet.getRow(i);
                if (row == null) {
                    row = sheet.createRow(i);
                }
                cell = getCell(row,0,cell);
                cell.setCellStyle(style);
                cell.setCellValue(wechatUser.getNickname());

                cell = getCell(row,1,cell);
                cell.setCellStyle(style);
                cell.setCellValue(wechatUser.getName());

                cell = getCell(row,2,cell);
                cell.setCellStyle(style);
                cell.setCellValue(wechatUser.getPhone());

                cell = getCell(row,3,cell);
                cell.setCellStyle(style);
                cell.setCellValue((null == wechatUser.getSex() ? "" :
                        (0 == wechatUser.getSex() ? "男" : "女")));

                cell = getCell(row,4,cell);
                cell.setCellStyle(style);
                cell.setCellValue(wechatUser.getGrade().getName());

                cell = getCell(row,5,cell);
                cell.setCellStyle(style);
                cell.setCellValue(wechatUser.getDefaultAddress());

                if (1 <= size) {
                    cell = getCell(row,6,cell);
                    cell.setCellStyle(style);
                    cell.setCellValue(childrenList.get(0).getName());

                    cell = getCell(row,7,cell);
                    cell.setCellStyle(style);
                    cell.setCellValue((null == childrenList.get(0).getGender() ? "" :
                            (0 == childrenList.get(0).getGender() ? "男" : "女")));

                    cell = getCell(row,8,cell);
                    cell.setCellStyle(style);
                    cell.setCellValue(
                            (null == childrenList.get(0).getBirthDay() ? "" :
                            DateUtil.dateToStr(
                                    childrenList.get(0).getBirthDay(),
                                    "yyyy-MM-dd")));
                }

                if (2 == size) {
                    cell = getCell(row,9,cell);
                    cell.setCellStyle(style);
                    cell.setCellValue(childrenList.get(1).getName());

                    cell = getCell(row,10,cell);
                    cell.setCellStyle(style);
                    cell.setCellValue((null == childrenList.get(1).getGender() ? "" :
                            (0 == childrenList.get(1).getGender() ? "男" : "女")));

                    cell = getCell(row,11,cell);
                    cell.setCellStyle(style);
                    cell.setCellValue((null == childrenList.get(1).getBirthDay() ? "" :
                            DateUtil.dateToStr(
                                    childrenList.get(1).getBirthDay(),
                                    "yyyy-MM-dd")));
                }
                i++;
            }
            //内容
            workbook.write(fos);
            fos.flush();
            fos.close();

            // 下载
            InputStream fis = new BufferedInputStream(new FileInputStream(
                    newFile));
            byte[] buffer = new byte[fis.available()];
            fis.read(buffer);
            fis.close();
            response.reset();
            response.setContentType("text/html;charset=UTF-8");
            OutputStream toClient = new BufferedOutputStream(
                    response.getOutputStream());
            response.setContentType("application/x-msdownload");
            String fileName = URLEncoder.encode(
                    "会员信息" + ".xls",
                    "UTF-8");
            fileName = new String(fileName.getBytes(), "ISO8859-1");
            response.addHeader("Content-Disposition",
                    "attachment;filename=" + fileName);
            response.addHeader("Content-Length", "" + newFile.length());
            toClient.write(buffer);
            toClient.flush();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (null != is) {
                    is.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
    // 删除创建的新文件
    this.deleteFile(newFile);
}