Example usage for org.apache.poi.poifs.crypt EncryptionMode agile

Introduction

In this page you can find the example usage for org.apache.poi.poifs.crypt EncryptionMode agile.

Prototype

EncryptionMode agile

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Usage

From source file:uk.ac.ucl.cs.cmic.giftcloud.uploader.ExcelWriter.java

License:Open Source License

@Override
protected void saveFile(final File file) throws IOException {
    if (spreadsheetPassword.isPresent() && StringUtils.isNotBlank(new String(spreadsheetPassword.get()))) {
        try {//  w w  w  .  jav a2 s .  co  m
            // Write the unencrypted spreadsheet to an in-memory stream
            final ByteArrayOutputStream baos = new ByteArrayOutputStream();
            workbook.write(baos);
            baos.close();

            // Create objects for encryption
            POIFSFileSystem fs = new POIFSFileSystem();
            EncryptionInfo info = new EncryptionInfo(fs, EncryptionMode.agile);
            Encryptor enc = info.getEncryptor();

            // Set the password
            enc.confirmPassword(new String(spreadsheetPassword.get()));

            // Open the in-memory spreadsheet
            InputStream inputStream = new ByteArrayInputStream(baos.toByteArray());
            OPCPackage opc = OPCPackage.open(inputStream);
            OutputStream os = enc.getDataStream(fs);
            opc.save(os);
            opc.close();
            inputStream.close();

            // Write the encrypted Excel spreadsheet
            FileOutputStream fos = new FileOutputStream(file);
            fs.writeFilesystem(fos);
            fos.close();
        } catch (InvalidFormatException e) {
            throw new IOException(
                    "Unable to save the patient list file due to the following InvalidFormatException when reading the excel file:"
                            + e.getLocalizedMessage(),
                    e);
        } catch (GeneralSecurityException e) {
            throw new IOException(
                    "Unable to save the patient list file due to the following GeneralSecurityException when reading the excel file:"
                            + e.getLocalizedMessage(),
                    e);
        }
    } else {
        // Write the unencrypted spreadsheet to an in-memory stream
        final FileOutputStream fos = new FileOutputStream(file);
        workbook.write(fos);
        fos.close();
    }
}

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