code: public static String toXml(Map<String, String> params) {
  		StringBuilder xml = new StringBuilder();
  		xml.append("<xml>");
  		for (Entry<String, String> entry : params.entrySet()) {
  			String key = entry.getKey();
  			String value = entry.getValue();
  			// 略过空值
  			if (StrKit.isBlank(value))
  				continue;
  			xml.append("<").append(key).append(">");
  			xml.append(entry.getValue());
  			xml.append("</").append(key).append(">");
  		}
  		xml.append("</xml>");
  		return xml.toString();
  	}
docs: 微信下单map to xml
  
  @param params
  参数
  @return {String}