在Java中加密和解密Properties文件可以通过使用Java的加密库实现。以下是一个示例代码，演示如何使用AES加密算法加密和解密Properties文件：
import javax.crypto.Cipher;import javax.crypto.spec.SecretKeySpec;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.util.Properties;public class PropertiesEncryption { private static final String SECRET_KEY = "ThisIsASecretKey"; public static void encryptPropertiesFile(String inputFilePath, String outputFilePath) throws Exception { Properties properties = new Properties(); properties.load(new FileInputStream(inputFilePath)); Cipher cipher = Cipher.getInstance("AES"); SecretKeySpec secretKeySpec = new SecretKeySpec(SECRET_KEY.getBytes(), "AES"); cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec); FileOutputStream outputStream = new FileOutputStream(outputFilePath); properties.storeToXML(outputStream, "Encrypted Properties"); outputStream.close(); } public static void decryptPropertiesFile(String inputFilePath, String outputFilePath) throws Exception { Properties properties = new Properties(); FileInputStream inputStream = new FileInputStream(inputFilePath); properties.loadFromXML(inputStream); inputStream.close(); Cipher cipher = Cipher.getInstance("AES"); SecretKeySpec secretKeySpec = new SecretKeySpec(SECRET_KEY.getBytes(), "AES"); cipher.init(Cipher.DECRYPT_MODE, secretKeySpec); FileOutputStream outputStream = new FileOutputStream(outputFilePath); properties.store(outputStream, "Decrypted Properties"); outputStream.close(); } public static void main(String[] args) { try { encryptPropertiesFile("input.properties", "encrypted.properties"); decryptPropertiesFile("encrypted.properties", "decrypted.properties"); } catch (Exception e) { e.printStackTrace(); } }}在上面的示例中，我们使用AES加密算法来加密和解密Properties文件。您可以将SECRET_KEY更改为自己的密钥。您可以使用properties.storeToXML()方法将Properties对象保存到XML文件中，以便在加密和解密时保留属性的结构。您可以根据需要更改加密和解密的文件路径和名称。
