public static String create_nonce_str() { return UUID.randomUUID().toString().replace("-",""); }

import java.io.Serializable; public class PayInfo implements Serializable{ private static final long serialVersionUID = L; private String appid; private String mch_id; private String device_info; private String nonce_str; private String sign; private String body; private String attach; private String out_trade_no; private int total_fee; private String spbill_create_ip; private String notify_url; private String trade_type; private String openid; //下面是get,set方法  } /** * 創(chuàng)建統(tǒng)一下單的xml的java對象 * @param bizOrder 系統(tǒng)中的業(yè)務單號 * @param ip 用戶的ip地址 * @param openId 用戶的openId * @return */ public PayInfo createPayInfo(BizOrder bizOrder,String ip,String openId) {  PayInfo payInfo = new PayInfo();  payInfo.setAppid(Constants.appid);  payInfo.setDevice_info("WEB");  payInfo.setMch_id(Constants.mch_id);  payInfo.setNonce_str(CommonUtil.create_nonce_str().replace("-", ""));  payInfo.setBody("這里是某某白米飯的body");  payInfo.setAttach(bizOrder.getId());  payInfo.setOut_trade_no(bizOrder.getOrderCode().concat("A").concat(DateFormatUtils.format(new Date(), "MMddHHmmss")));  payInfo.setTotal_fee((int)bizOrder.getFeeAmount());  payInfo.setSpbill_create_ip(ip);  payInfo.setNotify_url(Constants.notify_url);  payInfo.setTrade_type("JSAPI");  payInfo.setOpenid(openId);  return payInfo; }

/** * 獲取簽名 * @param payInfo * @return * @throws Exception */ public String getSign(PayInfo payInfo) throws Exception {  String signTemp = "appid="+payInfo.getAppid()   +"&attach="+payInfo.getAttach()   +"&body="+payInfo.getBody()   +"&device_info="+payInfo.getDevice_info()   +"&mch_id="+payInfo.getMch_id()   +"&nonce_str="+payInfo.getNonce_str()   +"¬ify_url="+payInfo.getNotify_url()   +"&openid="+payInfo.getOpenid()   +"&out_trade_no="+payInfo.getOut_trade_no()   +"&spbill_create_ip="+payInfo.getSpbill_create_ip()   +"&total_fee="+payInfo.getTotal_fee()   +"&trade_type="+payInfo.getTrade_type()   +"&key="+Constants.key; //這個key注意 MessageDigest md = MessageDigest.getInstance("MD"); md.reset(); md.update(signTemp.getBytes("UTF-")); String sign = CommonUtil.byteToStr(md.digest()).toUpperCase(); return sign; }

 /** * 將字節(jié)數(shù)組轉(zhuǎn)換為十六進制字符串 *  * @param byteArray * @return */ public static String byteToStr(byte[] byteArray) {  String strDigest = "";  for (int i = ; i < byteArray.length; i++) {  strDigest += byteToHexStr(byteArray[i]);  }  return strDigest; } /** * 將字節(jié)轉(zhuǎn)換為十六進制字符串 *  * @param btyes * @return */ public static String byteToHexStr(byte bytes) {  char[] Digit = { '', '', '', '', '', '', '', '', '', '', 'A', 'B', 'C', 'D', 'E', 'F' };  char[] tempArr = new char[];  tempArr[] = Digit[(bytes >>> ) & XF];  tempArr[] = Digit[bytes & XF];  String s = new String(tempArr);  return s; } /** * 獲取ip地址 * @param request * @return */ public static String getIpAddr(HttpServletRequest request) {   InetAddress addr = null;   try {   addr = InetAddress.getLocalHost();   } catch (UnknownHostException e) {   return request.getRemoteAddr();   }   byte[] ipAddr = addr.getAddress();   String ipAddrStr = "";   for (int i = ; i < ipAddr.length; i++) {   if (i > ) {    ipAddrStr += ".";   }   ipAddrStr += ipAddr[i] & xFF;   }   return ipAddrStr;  } 

 PayInfo pi = pu.createPayInfo(bo,"...",""); String sign = pu.getSign(pi); pi.setSign(sign);

 /** * 擴展xstream使其支持CDATA */ private static XStream xstream = new XStream(new XppDriver() {  public HierarchicalStreamWriter createWriter(Writer out) {  return new PrettyPrintWriter(out) {   //增加CDATA標記   boolean cdata = true;   @SuppressWarnings("rawtypes")   public void startNode(String name, Class clazz) {   super.startNode(name, clazz);   }   protected void writeText(QuickWriter writer, String text) {   if (cdata) {    writer.write("<![CDATA[");    writer.write(text);    writer.write("]]>");   } else {    writer.write(text);   }   }  };  } }); public static String payInfoToXML(PayInfo pi) {  xstream.alias("xml", pi.getClass());  return xstream.toXML(pi); }

 @SuppressWarnings("unchecked") public static Map<String, String> parseXml(String xml) throws Exception {  Map<String, String> map = new HashMap<String, String>();  Document document = DocumentHelper.parseText(xml);  Element root = document.getRootElement();  List<Element> elementList = root.elements();  for (Element e : elementList)  map.put(e.getName(), e.getText());  return map; }

log.info(MessageUtil.payInfoToXML(pi).replace("__", "_")); 　　Map<String, String> map = CommonUtil.httpsRequestToXML("https://api.mch.weixin.qq.com/pay/unifiedorder", "POST", MessageUtil.payInfoToXML(pi).replace("__", "_").replace("<![CDATA[", "").replace("]]>", "")); log.info(map); public static Map<String, String> httpsRequestToXML(String requestUrl, String requestMethod, String outputStr) {  Map<String, String> result = new HashMap<>();  try {  StringBuffer buffer = httpsRequest(requestUrl, requestMethod, outputStr);  result = MessageUtil.parseXml(buffer.toString());  } catch (ConnectException ce) {  log.error("連接超時："+ce.getMessage());  } catch (Exception e) {  log.error("https請求異常："+ece.getMessage());  }  return result; }

String return_code = map.get("return_code"); if(StringUtils.isNotBlank(return_code) && return_code.equals("SUCCESS")){ 　　String return_msg = map.get("return_msg"); if(StringUtils.isNotBlank(return_msg) && !return_msg.equals("OK")) { 　　return "統(tǒng)一下單錯誤！"; } }else{ 　　return "統(tǒng)一下單錯誤！"; } String prepay_Id = map.get("prepay_id");