java对称加解密

public class Test {
    public static void main(String[] args) throws Exception {
        // 加密信息"Hello, world!"，加密key数组1234567890abcdef，16个字节
        String message = "Hello, world!";
        System.out.println("Message: " + message);
        // 128位密钥 = 16 bytes Key:
        byte[] key = "1234567890abcdef".getBytes("UTF-8");
        // 加密:
        byte[] data = message.getBytes("UTF-8");
        byte[] encrypted = encrypt(key, data);
        System.out.println("Encrypted: " + Base64.getEncoder().encodeToString(encrypted));
        // 解密:
        byte[] decrypted = decrypt(key, encrypted);
        System.out.println("Decrypted: " + new String(decrypted, "UTF-8"));
    }

    // 加密:
    public static byte[] encrypt(byte[] key, byte[] input) throws GeneralSecurityException {
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        SecretKey keySpec = new SecretKeySpec(key, "AES");
        cipher.init(Cipher.ENCRYPT_MODE, keySpec);
        return cipher.doFinal(input);
    }

    // 解密:
    public static byte[] decrypt(byte[] key, byte[] input) throws GeneralSecurityException {
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        SecretKey keySpec = new SecretKeySpec(key, "AES");
        cipher.init(Cipher.DECRYPT_MODE, keySpec);
        return cipher.doFinal(input);
    }
}