apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/component/txtresolver/PropertyResolver.java/PropertyResolver/parseKeyValueFromItem
class PropertyResolver:  private String[] parseKeyValueFromItem(String item) {
    int kvSeparator = item.indexOf(KV_SEPARATOR);
    if (kvSeparator == -1) {
      return null;
    }

    String[] kv = new String[2];
    kv[0] = item.substring(0, kvSeparator).trim();
    kv[1] = item.substring(kvSeparator + 1).trim();
    return kv;
  }