code: public static int updateVirtualDns(Properties properties) {
  		Iterator<Entry<Object, Object>> iterator = properties.entrySet().iterator();
  		int count = 0;
  		while (iterator.hasNext()) {
  			Entry<Object, Object> entry = iterator.next();
  			if (!(entry.getKey() instanceof String) || !(entry.getValue() instanceof String)) {
  				continue;
  			}
  			String host = ((String) entry.getKey()).trim();
  			String ip = ((String) entry.getValue()).trim();
  
  			if (!isLocalHost(host)) {
  				count += updateVirtualDnsByStrings(host, ip);
  			}
  		}
  		return count;
  	}
docs: 更新虚拟DNS域名指向.
  
  @param properties
  key为域名，value为IP地址
  
  @return 更新虚拟DNS记录的条数