// AES加密    public static String encryptAccessToken(String content, String password) {        try {            KeyGenerator kgen = KeyGenerator.getInstance("AES");            kgen.init(128, new SecureRandom(password.getBytes()));            SecretKey secretKey = kgen.generateKey();            byte[] enCodeFormat = secretKey.getEncoded();            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");            Cipher cipher = Cipher.getInstance("AES");// 创建密码器            byte[] byteContent = content.getBytes("utf-8");            cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化            byte[] result = cipher.doFinal(byteContent);            return parseByte2HexStr(result); // 加密        } catch (Exception e) {            e.printStackTrace();        }        return null;    }    // AES解密    public static String decrypt(String content, String password) {        try {            byte[] contentBytes = parseHexStr2Byte(content);            KeyGenerator kgen = KeyGenerator.getInstance("AES");            kgen.init(128, new SecureRandom(password.getBytes()));            SecretKey secretKey = kgen.generateKey();            byte[] enCodeFormat = secretKey.getEncoded();            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");            Cipher cipher = Cipher.getInstance("AES");// 创建密码器            cipher.init(Cipher.DECRYPT_MODE, key);// 初始化            byte[] result = cipher.doFinal(contentBytes);            return new String(result); // 加密        } catch (Exception e) {            e.printStackTrace();        }        return null;    }    // 2进制转16进制    private static String parseByte2HexStr(byte buf[]) {        StringBuffer sb = new StringBuffer();        for (int i = 0; i < buf.length; i++) {            String hex = Integer.toHexString(buf[i] & 0xFF);            if (hex.length() == 1) {                hex = ‘0‘ + hex;            }            sb.append(hex.toUpperCase());        }        return sb.toString();    }    // 16进制转2进制    private static byte[] parseHexStr2Byte(String hexStr) {        if (hexStr.length() < 1)            return null;        byte[] result = new byte[hexStr.length() / 2];        for (int i = 0; i < hexStr.length() / 2; i++) {            int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);            int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2),                    16);            result[i] = (byte) (high * 16 + low);        }        return result;    }