无法将hssf工作簿转换为xssf工作簿

Question

我有一个Java应用程序，用于将hssf工作簿转换为xssf wokbook.workbook有预定义的模板。如果工作簿是EI想要将其从E.xls转换为E.xlsx，我能够做到我只是想将E.xls workbbok中的某些工作表转换为E.xlsx工作簿。面临的问题是，在最终的E.xlsx格式中要生成一个额外的工作表，即不需要，也没有填充：

     public String convertXlsToXlsx(String sourceXlsFile,String destinationXlsxFile) {
       log.info("Convertion from xls to xlsx Started...");

    inpFn = sourceXlsFile;
    // String xlsxIn = "D:\\arusha\\230029_06-30-2009_A.xlsx";
    outFn = destinationXlsxFile;
    try {
        in = new BufferedInputStream(new FileInputStream(inpFn));

        Workbook wbIn = new HSSFWorkbook(in);
        File outF = new File(outFn);

        FileInputStream input_document = new FileInputStream(
                new File(outFn));
        XSSFWorkbook outFn_workbook = new XSSFWorkbook(input_document);

        int sheetCnt = wbIn.getNumberOfSheets();
        System.out.println("The number of sheeetsss is"+sheetCnt);
        for (int i = 0; i < sheetCnt; i++) {

            Sheet sIn = wbIn.getSheetAt(i);
            XSSFSheet outFnSheet = outFn_workbook.getSheetAt(i);
        if (wbIn.isSheetHidden(i)) {
                outFn_workbook.setSheetHidden(i, true);
                continue;
            }
            if (wbIn.isSheetVeryHidden(i)) {
                outFn_workbook.setSheetHidden(i, true);
                continue;
            }

            Iterator<Row> rowIt = sIn.rowIterator();
            while (rowIt.hasNext()) {
                Row rowIn = rowIt.next();

                Iterator<Cell> cellIt = rowIn.cellIterator();
                while (cellIt.hasNext()) {
                    Cell cellIn = cellIt.next();

                    if (outFnSheet.getRow(cellIn.getRowIndex()) == null) {
                        continue;
                    }

                    Cell cellOut = outFnSheet.getRow(cellIn.getRowIndex())
                            .getCell(cellIn.getColumnIndex());

                    if (cellOut == null) {
                        continue;
                    }

                    if ((cellOut + "").trim().equalsIgnoreCase("X")
                            && !(cellIn + "").trim().equalsIgnoreCase("X")) {
                        XSSFCellStyle cs = outFn_workbook.createCellStyle();
                        XSSFFont font = outFn_workbook.createFont();
                        font.setFontHeightInPoints((short) 6);
                        cs.setFont(font);
                        cellOut.setCellStyle(cs);
                        XSSFCellStyle cellstyle = outFn_workbook
                                .createCellStyle();
                        cellstyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
                        cellOut.setCellStyle(cellstyle);
                    }
                    switch (cellIn.getCellType()) {
                    case Cell.CELL_TYPE_BLANK:
                        break;

                    case Cell.CELL_TYPE_BOOLEAN:
                        cellOut.setCellValue(cellIn.getBooleanCellValue());
                        break;

                    case Cell.CELL_TYPE_ERROR:
                        cellOut.setCellValue(cellIn.getErrorCellValue());
                        break;

                    case Cell.CELL_TYPE_FORMULA:
                        cellOut.setCellFormula(cellIn.getCellFormula());
                        break;

                    case Cell.CELL_TYPE_NUMERIC:
                        cellOut.setCellValue(cellIn.getNumericCellValue());
                        break;

                    case Cell.CELL_TYPE_STRING:
                        cellOut.setCellValue(cellIn.getStringCellValue());
                        break;
                    }
                }
            }
        }

        try {

            // important to close InputStream
            input_document.close();
            // Open FileOutputStream to write updates
            FileOutputStream output_file = new FileOutputStream(new File(
                    outFn));
            // write changes

            outFn_workbook.write(output_file);

            System.out.println("sheet removed");

            // close the stream
            output_file.close();

            // wbOut.write(out);
        } catch (Exception e) {
            log.error("XlsToXlsx:",e);
        }

    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            in.close();
        } catch (IOException e) {
            log.error("XlsToXlsx:",e);
        }
    }
    return outFn;
}

public static void main(String[] args) {
    // TODO Auto-generated method stub

}

}

我尝试使用removeSheetAt（）方法删除工作表，但效果不理想。请帮助我。谢谢。