properties文件加密

可以使用Java的加密工具类来加密properties文件，例如使用Java的Cipher类和KeyGenerator类来生成密钥和加密/解密文件内容。以下是一个示例代码：

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.io.*;
import java.security.NoSuchAlgorithmException;

public class PropertiesEncryption {

    private static final String ALGORITHM = "AES";
    private static final int KEY_SIZE = 128;

    public static void main(String[] args) {
        try {
            // Generate a random key
            SecretKey secretKey = KeyGenerator.getInstance(ALGORITHM).generateKey();

            // Encrypt the properties file
            encryptPropertiesFile("my.properties", "my.properties.enc", secretKey);

            // Decrypt the properties file
            decryptPropertiesFile("my.properties.enc", "my.properties", secretKey);

        } catch (NoSuchAlgorithmException | IOException e) {
            e.printStackTrace();
        }
    }

    private static void encryptPropertiesFile(String inputFile, String outputFile, SecretKey secretKey) throws IOException {
        try (InputStream inputStream = new FileInputStream(inputFile);
             OutputStream outputStream = new FileOutputStream(outputFile)) {

            // Initialize the cipher with the secret key
            Cipher cipher = Cipher.getInstance(ALGORITHM);
            cipher.init(Cipher.ENCRYPT_MODE, secretKey);

            // Read the input file and encrypt its contents
            byte[] inputBytes = new byte[inputStream.available()];
            inputStream.read(inputBytes);
            byte[] outputBytes = cipher.doFinal(inputBytes);

            // Write the encrypted contents to the output file
            outputStream.write(outputBytes);
        } catch (Exception e) {
            throw new IOException("Error encrypting properties file", e);
        }
    }

    private static void decryptPropertiesFile(String inputFile, String outputFile, SecretKey secretKey) throws IOException {
        try (InputStream inputStream = new FileInputStream(inputFile);
             OutputStream outputStream = new FileOutputStream(outputFile)) {

            // Initialize the cipher with the secret key
            Cipher cipher = Cipher.getInstance(ALGORITHM);
            cipher.init(Cipher.DECRYPT_MODE, secretKey);

            // Read the input file and decrypt its contents
            byte[] inputBytes = new byte[inputStream.available()];
            inputStream.read(inputBytes);
            byte[] outputBytes = cipher.doFinal(inputBytes);

            // Write the decrypted contents to the output file
            outputStream.write(outputBytes);
        } catch (Exception e) {
            throw new IOException("Error decrypting properties file", e);
        }
    }

}

在这个示例中，我们使用AES算法和128位密钥来加密properties文件。在主方法中，我们首先生成一个随机密钥，然后使用该密钥加密和解密properties文件。encryptPropertiesFile()和decryptPropertiesFile()方法分别用于加密和解密文件内容。在这些方法中，我们使用Cipher类来初始化加密和解密器，并使用SecretKey类来存储生成的随机密钥。最后，我们将加密后的内容写入outputFile，或将解密后的内容写入outputFile。