function encrypt($string) {
$output = false;

$encrypt_method = "AES-256-CBC";

$secret_key = 'abcdefghijklmnño';
$secret_iv = 'adb6ad2f3ae01b30';

// hash
$key = hash('sha256', $secret_key);

// iv - encrypt method AES-256-CBC expects 16 bytes - else you will get a warning
$iv = substr(hash('sha256', $secret_iv), 0, 16);



    $output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv);
    $output = base64_encode($output);

return $output;
}

public static String encrypt( String value) {
        try {
            String key = "abcdefghijklmnño";
String initVector = "adb6ad2f3ae01b30";
            IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
            SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES");

            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);

            byte[] encrypted = cipher.doFinal(value.getBytes());
            System.out.println("encrypted string: "
                    + Base64.encodeBase64String(encrypted));

            return Base64.encodeBase64String(encrypted);
        } catch (Exception ex) {
            ex.printStackTrace();
        }

        return null;
    }

  try{
   // Se crea una referencia al documento excel
   HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(documentoDir));
   // indicamos la hoja que queremos leer
   HSSFSheet sheet = workbook.getSheet("Parte diario");
   //ponemos filtro
   sheet.setAutoFilter(CellRangeAddress.valueOf("A1:P10000"));
   
   try (FileOutputStream out = new FileOutputStream(documentoDir)) {
    workbook.write(out);
        } 
  
  }catch(Exception e) {
   System.out.println("Error! " + e );
  }