public String toJson() {
        parameters.put(APP_NAME_KEY, this.appName);
        String result = JSON.toJSONString(parameters);
        return result;

    }
@author <a href=mailto:leizhiyuan@gmail.com>leizhiyuan</a>
registry/registry-mesh/src/main/java/com/alipay/sofa/rpc/registry/mesh/model/ApplicationInfoRequest.java