在AES 256加密的字段中包含文件分隔符可能会导致数据格式错误，因此需要进行特殊处理。

我们可以使用Base64编码将文件转换为字符串后进行加密，而后再将加密后的字符串插入到数据库中，以此避免文件分隔符对数据的影响。

示例代码：

// 加密

private static String encryptField(String field) { String encryptedField = null; try { byte[] key = "mySecretKey123456".getBytes("UTF-8"); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); SecretKeySpec secretKeySpec = new SecretKeySpec(key, "AES"); cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, new IvParameterSpec(new byte[16])); byte[] encrypted = cipher.doFinal(Base64.encodeBase64(field.getBytes("UTF-8"))); encryptedField = new String(encrypted, "UTF-8"); } catch (UnsupportedEncodingException | NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | InvalidAlgorithmParameterException | IllegalBlockSizeException | BadPaddingException e) { e.printStackTrace(); } return encryptedField; }

// 解密

private static String decryptField(String encryptedField) { String decryptedField = null; try { byte[] key = "mySecretKey123456".getBytes("UTF-8"); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); SecretKeySpec secretKeySpec = new SecretKeySpec(key, "AES"); cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, new IvParameterSpec(new byte[16])); byte[] decrypted = cipher.doFinal(Base64.decodeBase64(encryptedField.getBytes("UTF-8"))); decryptedField = new String(decrypted, "UTF-8"); } catch (UnsupportedEncodingException | NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | InvalidAlgorithmParameterException | IllegalBlockSizeException | BadPaddingException e) { e.printStackTrace(); } return decryptedField; }

// 使用示例

String field = "/path/to/file.txt"; String encryptedField = encryptField(field); System.out.println("加密后的字段