@Service
public class WxpayService {
 private final static Logger log = LoggerFactory.getLogger(WxpayService.class);
 @Autowired
 WxSecureTools wxSecureTools;
 @Autowired
 WxHttpClient wxHttpClient;
 @Autowired
 WxMchConfig wxMchConfig;
 public String testWxpay() {
  try {
   String requestXml = buildRequestParam();
   log.info("request xml : {}", requestXml);
   String result = wxHttpClient.post(wxMchConfig.getBindAppIdUrl(), requestXml, false);
   log.info("response xml : {}", result);
   return result;
  } catch (Exception e) {
   log.error("post error", e);
  }
  return null;
 }
 private String buildRequestParam() throws Exception {
  SubMchBindAppIdReqVo reqVo = new SubMchBindAppIdReqVo();
  reqVo.setAppid(wxMchConfig.getAppId());
  reqVo.setMch_id(wxMchConfig.getMchId());
  reqVo.setSub_appid("wx8xxxxxxxxx7");
  reqVo.setSub_mch_id("34xxxxxxxx32");
  String waittingForSign = StringUtils.convert(reqVo) + "&key=" + wxMchConfig.getSecretKey();
  String sign = wxSecureTools.getMD5(waittingForSign);
  reqVo.setSign(sign);
  Document document = DocumentHelper.createDocument();
  Element rootEle = document.addElement("xml");
  rootEle.addElement("appid").addCDATA(reqVo.getAppid());
  rootEle.addElement("mch_id").addCDATA(reqVo.getMch_id());
  rootEle.addElement("sub_appid").addCDATA(reqVo.getSub_appid());
  rootEle.addElement("sub_mch_id").addCDATA(reqVo.getSub_mch_id());
  rootEle.addElement("sign").addCDATA(reqVo.getSign());
  document.setXMLEncoding("UTF-8");
  return document.asXML();
 }
}