class JSONUtils {

    public static Map<String, String> toMap(String json) {
        if (StringUtils.isEmpty(json)) {
            return null;
        }

        try {
            return objectMapper.readValue(json, new TypeReference<Map<String, String>>() {
            });
        } catch (Exception e) {
            logger.error("json to map exception!", e);
        }

        return null;
    }

    private  JSONUtils();

}