public void putAll(final Props p) {
    if (p == null) {
      return;
    }

    for (final String key : p.getKeySet()) {
      this.put(key, p.get(key));
    }
  }
Put all properties in the props into the current props. Will handle null p.
dss-appconn/appconns/dss-eventchecker-appconn/src/main/java/com/webank/wedatasphere/dss/appconn/eventchecker/utils/Props.java