架构师 0 期 11 周作业

public class MD5Utils {
    public static String digest(final String str, final String salt)
            throws NoSuchAlgorithmException {
        MessageDigest md5 = MessageDigest.getInstance("MD5");
        final String input = str + "23dtyb" + salt;
        final byte[] output = md5.digest(input.getBytes());
        //todo 需要做一些处理
        return new String(output);
    }
}

public class Login {
    public static void main(String[] args) throws Exception {
        String userId = "100001";
        String userPW = "fhgrgjidjfdljfkdjfdlj";
        String digestedPW = "��\u001C���̂�C\n" +
                "�\u0010�";
        Boolean loginSucceed = checkPW(userId, userPW, digestedPW);
        if (loginSucceed) {
            return;
        }
        throw new Exception("password error");
    }
    static Boolean checkPW(String userId, String userPW, String userDigestedPW) throws Exception {
        try {
            String digestedPW = MD5Utils.digest(userPW, userId);
            if (digestedPW.equals(userDigestedPW)) {
                return true;
            }
            return false;
        } catch (final NoSuchAlgorithmException e) {
            //todo 抛出业务异常
            throw new Exception("");
        }
    }
}