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अधुना एव एकः परिदृश्यः आसीत् यत्र ftp सर्वरे csv सञ्चिकां पठित्वा दत्तांशकोशे स्थापिताः, परन्तु ग्राहकेन प्रदत्ताः काश्चन सञ्चिकाः xls सञ्चिकाः आसन् अतः अस्माभिः excel इत्यस्य csv सञ्चिकासु परिवर्तनस्य उपायः अन्वेष्टव्यः आसीत् अग्रे विना आरभत।

प्रक्रिया

    public static void convertExcelToCSV(String excelFilePath, String csvFilePath) throws IOException {
        FileInputStream inputStream = new FileInputStream(excelFilePath);
        Workbook workbook = getWorkbook(inputStream, excelFilePath);
        inputStream.close();

        FileWriter writer = new FileWriter(csvFilePath);

        for (int sheetIndex = 0; sheetIndex < workbook.getNumberOfSheets(); sheetIndex++) {
            Sheet sheet = workbook.getSheetAt(sheetIndex);
            Iterator<Row> rowIterator = sheet.iterator();

            while (rowIterator.hasNext()) {
                Row row = rowIterator.next();
                Iterator<Cell> cellIterator = row.cellIterator();
                StringBuilder stringBuilder = new StringBuilder();

                while (cellIterator.hasNext()) {
                    Cell cell = cellIterator.next();
                    stringBuilder.append(getCellValue(cell));
                    if (cellIterator.hasNext()) {
                        stringBuilder.append(",");
                    }
                }

                writer.write(stringBuilder.toString() + "n");
            }

            if (sheetIndex < workbook.getNumberOfSheets() - 1) {
                writer.write("n"); // 在不同工作表之间添加一个空行
            }
        }

        writer.flush();
        writer.close();
        workbook.close();
    }

    private static Workbook getWorkbook(FileInputStream inputStream, String excelFilePath) throws IOException {
        Workbook workbook = null;
        if (excelFilePath.endsWith("xlsx")) {
            workbook = new XSSFWorkbook(inputStream);
        } else if (excelFilePath.endsWith("xls")) {
            workbook = new HSSFWorkbook(inputStream);
        } else {
            throw new IllegalArgumentException("The specified file is not an Excel file");
        }
        return workbook;
    }

    private static String getCellValue(Cell cell) {
        //DataFormatter formatter = new DataFormatter();
        String formatPattern = "yyyy-MM-dd HH:mm:ss"; // 自定义日期时间格式
        //FormulaEvaluator evaluator = cell.getSheet().getWorkbook().getCreationHelper().createFormulaEvaluator();
        switch (cell.getCellType()) {
            case STRING:
                return cell.getRichStringCellValue().getString();
            case NUMERIC:
                if (DateUtil.isCellDateFormatted(cell)) {
                    Date date = cell.getDateCellValue();
                    DateFormat dateFormat = new SimpleDateFormat(formatPattern);
                    return dateFormat.format(date);
                } else {
                    return Double.toString(cell.getNumericCellValue());
                }
            case BOOLEAN:
                return Boolean.toString(cell.getBooleanCellValue());
            case FORMULA:
                return cell.getCellFormula();
            default:
                return "";
        }
    }

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परीक्षा

    public static void main(String[] args) {
        String excelFilePath = "D:\我是excel文件.xlsx";
        String csvFilePath = "D:\我是csv文件.csv";

        try {
            convertExcelToCSV(excelFilePath, csvFilePath);
            System.out.println("Excel file converted to CSV successfully!");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
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उपर्युक्तं समाकलनम्保留时间格式आवश्यकाः सर्वे कोडाः, व्यक्तिगतपरीक्षायाः उपयोगः अतीव सुलभः अस्ति!