public class AgentUserKit {

    private static String pattern = "^Mozilla/\\d\\.\\d\\s+\\(+.+?\\)";

    private static String pattern2 = "\\(+.+?\\)";

    private static Pattern r = Pattern.compile(pattern);

    private static Pattern r2 = Pattern.compile(pattern2);

    public static String getDeviceInfo(HttpServletRequest request) {

        String userAgent = request.getHeader("User-Agent");

        if (userAgent==null){

            return null;

        }

        return getDeviceInfo(userAgent);

    }

    private static String getDeviceInfo(String userAgent) {

        String result=null;

        try {

            Matcher m = r.matcher(userAgent);

            if (m.find()) {

                result = m.group(0);

            }

            Matcher m2 = r2.matcher(result);

            if (m2.find()) {

                result = m2.group(0);

            }

            result = result.replace("(", "");

            result = result.replace(")", "");

        } catch (Exception e) {

            return userAgent;

        }

        return filterDeviceInfo(result);

    }

    public static String filterDeviceInfo(String result) {

        if (StringUtils.isEmpty(result)) {

            return null;

        }

        result = result.replace(" U;", "");

        result = result.replace(" zh-cn;", "");

        return result;

    }

}