Java DES加密/解密方法

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.nio.charset.StandardCharsets;
import java.util.Base64;

public class DESUtil {
    private static final String ALGORITHM = "DES";

    public static String encrypt(String plainText, String key) throws Exception {
        DESKeySpec desKeySpec = new DESKeySpec(key.getBytes(StandardCharsets.UTF_8));
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
        SecretKey secretKey = keyFactory.generateSecret(desKeySpec);

        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);

        byte[] encryptedBytes = cipher.doFinal(plainText.getBytes(StandardCharsets.UTF_8));
        return Base64.getEncoder().encodeToString(encryptedBytes);
    }

    public static String decrypt(String encryptedText, String key) throws Exception {
        DESKeySpec desKeySpec = new DESKeySpec(key.getBytes(StandardCharsets.UTF_8));
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
        SecretKey secretKey = keyFactory.generateSecret(desKeySpec);

        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(Cipher.DECRYPT_MODE, secretKey);

        byte[] encryptedBytes = Base64.getDecoder().decode(encryptedText);
        byte[] decryptedBytes = cipher.doFinal(encryptedBytes);
        return new String(decryptedBytes, StandardCharsets.UTF_8);
    }
}

String plainText = "Hello, World!";
String key = "12345678";

String encryptedText = DESUtil.encrypt(plainText, key);
System.out.println("Encrypted Text: " + encryptedText);

String decryptedText = DESUtil.decrypt(encryptedText, key);
System.out.println("Decrypted Text: " + decryptedText);