report.xlsx 的文件格式和扩展名不匹配

Question

Servlet 和 DAO 代码如下所示：

        @WebServlet("/ExcelExportController")
        public class ExcelExportController extends HttpServlet {
            private static final long serialVersionUID = 1L;

            /**
             * @see HttpServlet#HttpServlet()
             */
            public ExcelExportController() {
                super();
                // TODO Auto-generated constructor stub
            }

            /**
             * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
             *      response)
             */
            @SuppressWarnings("unchecked")
            protected void doPost(HttpServletRequest request,
                    HttpServletResponse response) throws ServletException, IOException {
                // TODO Auto-generated method stub
                HttpSession session = request.getSession();
                if (session != null) {
                    FileOutputStream fileOut;
                    List<LoanOffersDTO> loanOffersDTOs;
                    ExcelExportDAO excelExportDAO;
                    HSSFWorkbook hssfWorkbook;
                    if (session.getAttribute("loanOffers") != null) {
                        loanOffersDTOs = (List<LoanOffersDTO>) session
                                .getAttribute("loanOffers");
                        excelExportDAO = new ExcelExportDAOImpl();
                        hssfWorkbook = excelExportDAO
                                .createLoanOffersXls(loanOffersDTOs);
                        if (hssfWorkbook != null) {
                            fileOut = new FileOutputStream("report.xlsx");
                            response.setContentType("application/application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
                            response.setHeader("Content-Disposition",
                                    "attachment; filename=report.xlsx");
                            hssfWorkbook.write(fileOut);
                            fileOut.flush();
                            fileOut.close();
                        } else {

                        }
                    }
                }

            }

        }

public class ExcelExportDAOImpl implements ExcelExportDAO {

    @Override
    public HSSFWorkbook createLoanOffersXls(List<LoanOffersDTO> loanOffersDTOs) throws IOException {
        HSSFWorkbook workbook = new HSSFWorkbook();
        HSSFSheet sheet = workbook.createSheet("LoanOffer");

        HSSFRow headRow = sheet.createRow(0);
        headRow.createCell(0).setCellValue("Bank Name");
        headRow.createCell(1).setCellValue("Offer Name");
        headRow.createCell(2).setCellValue("Loan Officer");
        headRow.createCell(3).setCellValue("Telephone");
        headRow.createCell(4).setCellValue("Email");
        headRow.createCell(5).setCellValue("Interest Rate");
        headRow.createCell(6).setCellValue("Period");
        headRow.createCell(7).setCellValue("Pre-Payment");
        headRow.createCell(8).setCellValue("Installment");
        headRow.createCell(9).setCellValue("Loan details");

        HSSFRow dataRow;
        int rowCount = 1;
        for (LoanOffersDTO loanOffersDTO : loanOffersDTOs) {
            dataRow = sheet.createRow(rowCount++);
            dataRow.createCell(0).setCellValue(loanOffersDTO.getBankName());
            dataRow.createCell(1).setCellValue(loanOffersDTO.getOfferName());
            dataRow.createCell(2).setCellValue(
                    loanOffersDTO.getLoanOfficerName());
            dataRow.createCell(3).setCellValue(
                    loanOffersDTO.getBankerContactNum());
            dataRow.createCell(4)
                    .setCellValue(loanOffersDTO.getBankerEmailId());
            dataRow.createCell(5).setCellValue(loanOffersDTO.getInterestRate());
            dataRow.createCell(6).setCellValue(loanOffersDTO.getDuration());
            dataRow.createCell(7).setCellValue(
                    loanOffersDTO.getPrePaymentValue());
            dataRow.createCell(8).setCellValue(loanOffersDTO.getInstallments());
            dataRow.createCell(9).setCellValue(
                    loanOffersDTO.getLoanDescription());
        }

        FileOutputStream fileOut  = new FileOutputStream("C:\Users\Test\Desktop\report_"+Calendar.getInstance().getTimeInMillis()+".xls");
        workbook.write(fileOut);
        fileOut.flush();
        fileOut.close();

        return workbook;
    }
}

总结：

我有一个 jsp，提交时上面的 servlet/controller 是 called.This sevelet 将创建 excel 文件并刷新 Excel。这里 excel 文件是使用 "apache poi" 创建的。 excel 被创建并清除，在尝试打开它时我看到没有数据的错误 "File Format and extension of the report.xlsx don't match."。但是，如果我尝试将同一个文件刷新到某个特定位置，我就会完美地接收到该文件。我什至尝试过将内容类型设置为 "application/vnd.ms-excel" 但问题是一样的。谢谢

Answer 1

你好像有两个问题。一是您使用的是生成 .xls 文件的 HSSF 代码，但发送的是 .xlsx 样式的响应。其次，您是将工作簿写入服务器上的文件，而不是将其发送回客户端！

我建议将您的代码更改为通用代码以处理这两者，例如

Workbook workbook;
....
workbook = excelExportDAO.createLoanOffersXls(loanOffersDTOs);
if (workbook != null) {
    if (workbook instanceof HSSFWorkbook) {
       response.setContentType("application/vnd.ms-excel");
       response.setHeader("Content-Disposition",
                                "attachment; filename=report.xls");
    } else {
       response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
       response.setHeader("Content-Disposition",
                                "attachment; filename=report.xlsx");
    }
    OutputStream out = response.getOutputStream();
    hssfWorkbook.write(out);    
    out.close();
}

report.xlsx 的文件格式和扩展名不匹配

File Format and extension of the report.xlsx don't match

java

servlets

export-to-excel

apache-poi