使用 apache poi 在 Android 中覆盖后 Excel 文件被损坏

Question

I want to overwrite an excel file, but the overwritten file gets corrupted. I am working with android studio and I want to save information into single excel file. Below is my code:

private void saveIntoExcel(String fileName, String[] data) {
    try {
        String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + getString(R.string.app_name) + "/" + fileName;

        InputStream inp = new FileInputStream(new File(path));

        HSSFWorkbook workbook = new HSSFWorkbook(inp);
        HSSFSheet sheet = workbook.getSheetAt(0);
        HSSFRow row;

        row = sheet.createRow(sheet.getLastRowNum() + 1);
        for (int i = 0; i < data.length; i++) {
            HSSFCell cell = row.createCell(i);
            cell.setCellValue(data[i]);
        }

        FileOutputStream fos = null;
        File file;

        file = new File(path);
        fos = new FileOutputStream(file);

        workbook.write(fos);
        fos.close();        

        showToast(str_success);
    } catch (Exception e) {
        showToast(e.getMessage());
    }
}

I tested this code with excel files on pc and works perfectly, but in android the files gets corrupted.

Answer 1

Apache POI does not fully support in-place writing of the changed file the way you try to do it.

There is discussion about providing this via a new write() method, but currently you will need to write to a different file to avoid corrupting things during closing the objects. After the workbook is closed you can move the new file over the old one if necessary.

See some related discussion and this bug .