list数据导出excel并且下载到本地

  @Override
    public void  exportExcel(Integer[] ids,HttpServletResponse response) {
        List<WithdrawDeposit> listMsg = new ArrayList<>();
        WithdrawDeposit withdrawDeposit;
        for (Integer id : ids) {
            withdrawDeposit = settlementDao.getSettlementInfo(id);
            listMsg.add(withdrawDeposit);
        }
        SimpleDateFormat format = new SimpleDateFormat("yyyy/MM/dd");
        String dirPath = ImgUploadUtil.EXCEL_DIR;//导出到磁盘的位置 配置文件的配置
        String fileName = new Date().getTime() + ".xls";//生成的excel文件名
        File dir = new File(dirPath);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        dirPath = dirPath + "/" + fileName;//文件路径
        try {
            //*.xls为要新建的文件名
            WritableWorkbook book = Workbook.createWorkbook(new File(dirPath));
            //生成名为“***”的工作表，参数0表示这是第一页
            WritableSheet ws = book.createSheet("结算申请记录", 0);

            // 写表头
            jxl.write.Label label1 = new jxl.write.Label(0, 0, "申请号");
            jxl.write.Label label2 = new jxl.write.Label(1, 0, "提现金额");
            jxl.write.Label label3 = new jxl.write.Label(2, 0, "申请时间");
            jxl.write.Label label4 = new jxl.write.Label(3, 0, "支付类型");
            jxl.write.Label label5 = new jxl.write.Label(4, 0, "账号");
            jxl.write.Label label6 = new jxl.write.Label(5, 0, "状态");

            ws.addCell(label1);// 放入工作簿
            ws.addCell(label2);
            ws.addCell(label3);
            ws.addCell(label4);
            ws.addCell(label5);
            ws.addCell(label6);

            for (int i = 0; i < listMsg.size(); i++) {
                label1 = new jxl.write.Label(0, i + 1, listMsg.get(i).getApplicationNo());// 建立第一列
                label2 = new jxl.write.Label(1, i + 1, listMsg.get(i).getAmount().toString().trim());// 建立第二列
                label3 = new jxl.write.Label(2, i + 1, format.format(listMsg.get(i).getOpTime()));// 建立第三列
                label4 = new jxl.write.Label(3, i + 1, listMsg.get(i).getPayType());// 建立第四列
                label5 = new jxl.write.Label(4, i + 1, listMsg.get(i).getAccountNo());// 建立第五列
                label6 = new jxl.write.Label(5, i + 1, listMsg.get(i).getStatus());// 建立第六列
                // 放入工作簿
                ws.addCell(label1);
                ws.addCell(label2);
                ws.addCell(label3);
                ws.addCell(label4);
                ws.addCell(label5);
                ws.addCell(label6);
            }
            //写入数据
            book.write();
            //关闭文件
            book.close();
            System.out.println("导出成功！！！！！！！！");


            // 下载到本地
            ServletOutputStream out = response.getOutputStream();
            response.setContentType("application/x-download");
            response.setHeader("Content-Disposition", "attachment;filename="
                + new String(fileName.getBytes("gb2312"), "ISO8859-1"));
            byte[] bytes = new byte[0xffff];
            InputStream is = new FileInputStream(new File(dirPath));
            int b;
            while ((b = is.read(bytes, 0, 0xffff)) > 0) {
                out.write(bytes, 0, b);
            }
            is.close();
            out.flush();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }