code: public static MchBaseResult payCloseorder(Closeorder closeorder,String key){
  		Map<String,String> map = MapUtil.objectToMap(closeorder);
  		String sign = SignatureUtil.generateSign(map,closeorder.getSign_type(),key);
  		closeorder.setSign(sign);
  		String closeorderXML = XMLConverUtil.convertToXML(closeorder);
  		HttpUriRequest httpUriRequest = RequestBuilder.post()
  				.setHeader(xmlHeader)
  				.setUri(baseURI()+ "/pay/closeorder")
  				.setEntity(new StringEntity(closeorderXML,Charset.forName("utf-8")))
  				.build();
  		return LocalHttpClient.executeXmlResult(httpUriRequest,MchBaseResult.class,closeorder.getSign_type(),key);
  	}
docs: 关闭订单
  @param closeorder closeorder
  @param key 商户支付密钥
  @return MchBaseResult