解决 Cannot find any provider supporting AES/ECB/PKCS7Padding

添加 BouncyCastle provider

// 添加 BouncyCastle provider
Security.addProvider(new BouncyCastleProvider());

示例

 public static void main(String[] args) throws Exception {
        // 添加 BouncyCastle provider
        Security.addProvider(new BouncyCastleProvider());

        // 定义密钥
        byte[] keyBytes = "0123456009abcdef".getBytes("UTF-8");
        SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");

        // 初始化加密解密器
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
        cipher.init(Cipher.ENCRYPT_MODE, keySpec);

        // 执行加密操作
        byte[] input = "TEST".getBytes("UTF-8");
        byte[] encrypted = cipher.doFinal(input);

        // 输出加密结果
        System.out.println("Encrypted: " + new String(encrypted, "UTF-8"));
    }