Xlsx文件不为动态数据生成

Question

我有一个表格数据。其中包含日期列。我正在做的是，我将选定的日期传递给servlet。使用那个日期我从表中得到了一些记录。然后我使用Apache POI创建一个名为Microsoft Excel文件的工作簿，并将该数据存储到excel文件中。

这是我的代码：

String reports_date = request.getParameter("reports_date");

    //CreateJobOrderBean joborderbean = new CreateJobOrderBean();
    BSUtils bsutils = new BSUtils();

            //Received Date format: 09-Dec-2015(dd-MMM-yyyy)
            SimpleDateFormat formatter = new SimpleDateFormat("dd-MMM-yyyy");
            SimpleDateFormat formatter1 = new SimpleDateFormat("yyyy-MM-dd");
            Date date = null;
            String formatteddate = null;
                try {
                    date = formatter.parse(reports_date);
                    formatteddate = formatter1.format(date);
                    date = formatter1.parse(formatteddate);
                } catch (ParseException e) {
                    e.printStackTrace();
                }
            XSSFWorkbook workbook = new XSSFWorkbook(); 
              XSSFSheet spreadsheet = workbook.createSheet("JobOrders Data");
              XSSFRow row=spreadsheet.createRow(1);
              XSSFCell cell;
              cell=row.createCell(1);
              cell.setCellValue("owner_name");
              cell=row.createCell(2);
              cell.setCellValue("owner_tel1");
              cell=row.createCell(3);
              cell.setCellValue("location");
              cell=row.createCell(4);
              cell.setCellValue("postcode");
              cell=row.createCell(5);
              cell.setCellValue("nature_of_case");
              cell=row.createCell(6);
              cell.setCellValue("cause");
              cell=row.createCell(7);
              cell.setCellValue("assign_to_mktg");
              cell=row.createCell(8);
              cell.setCellValue("assign_to_qs");
              cell=row.createCell(9);
              cell.setCellValue("job_created_on");

             int i=2;
              List<CreateJobOrderBean> reports_data = bsutils.getReportsDate(date);
              System.out.println(reports_data.size());
             for (int j = 0; j < reports_data.size(); j++) {
                 row=spreadsheet.createRow(i);
                 cell=row.createCell(1);
                 cell.setCellValue(reports_data.get(j).getOwnername());
                 cell=row.createCell(2);
                 cell.setCellValue(reports_data.get(j).getTel1());
                 cell=row.createCell(3);
                 cell.setCellValue(reports_data.get(j).getLocation());
                 cell=row.createCell(4);
                 cell.setCellValue(reports_data.get(j).getPostcode());
                 cell=row.createCell(5);
                 cell.setCellValue(reports_data.get(j).getNatureofcase());
                 cell=row.createCell(6);
                 cell.setCellValue(reports_data.get(j).getCause());
                 cell=row.createCell(7);
                 cell.setCellValue(reports_data.get(j).getAssignedmarketingemail());
                 cell=row.createCell(8);
                 cell.setCellValue(reports_data.get(j).getAssignedQs());
                 cell=row.createCell(9);
                 cell.setCellValue(reports_data.get(j).getJobCreatesOnasString());
                 i++;
              }
              FileOutputStream out = new FileOutputStream(new File("D:/joborders_database.xlsx"));
              workbook.write(out);
              out.close();

此代码成功运行，但xlsx文件未生成。我不知道我在哪里犯了错误。