上一篇已經(jīng)獲取到了用戶的OpenId
這篇主要是調(diào)用微信公眾支付的統(tǒng)一下單API
API地址:https://pay.weixin.QQ.com/wiki/doc/api/jsapi.php?chapter=9_1
看文檔,主要流程就是把20個左右的參數(shù)封裝為xml格式發(fā)送到微信給的接口地址,然后就可以獲取到返回的內(nèi)容了,如果成功里面就有支付所需要的預(yù)支付ID
請求參數(shù)就不解釋了。
其中,隨機字符串:我用的是UUID去中劃線
1 public static String create_nonce_str() {2 return UUID.randomUUID().toString().replace("-","");3 }
商戶訂單號:每個訂單號只能使用一次,所以用的是系統(tǒng)的訂單號加的時間戳。
總金額:不能為0
通知地址:微信支付成功或失敗回調(diào)給系統(tǒng)的地址
簽名:
1 import java.io.Serializable; 2 3 public class PayInfo implements Serializable{ 4 5 PRivate static final long serialVersionUID = 5637164279924222380L; 6 private String appid; 7 private String mch_id; 8 private String device_info; 9 private String nonce_str;10 private String sign;11 private String body;12 private String attach;13 private String out_trade_no;14 private int total_fee;15 private String spbill_create_ip;16 private String notify_url;17 private String trade_type;18 private String openid;19 20 //下面是get,set方法 21 }
1 /** 2 * 創(chuàng)建統(tǒng)一下單的xml的java對象 3 * @param bizOrder 系統(tǒng)中的業(yè)務(wù)單號 4 * @param ip 用戶的ip地址 5 * @param openId 用戶的openId 6 * @return 7 */ 8 public PayInfo createPayInfo(BizOrder bizOrder,String ip,String openId) { 9 PayInfo payInfo = new PayInfo();10 payInfo.setAppid(Constants.appid);11 payInfo.setDevice_info("WEB");12 payInfo.setMch_id(Constants.mch_id);13 payInfo.setNonce_str(CommonUtil.create_nonce_str().replace("-", ""));14 payInfo.setBody("這里是某某白米飯的body");15 payInfo.setAttach(bizOrder.getId());16 payInfo.setOut_trade_no(bizOrder.getOrderCode().concat("A").concat(DateFormatUtils.format(new Date(), "MMddHHmmss")));17 payInfo.setTotal_fee((int)bizOrder.getFeeAmount());18 payInfo.setSpbill_create_ip(ip);19 payInfo.setNotify_url(Constants.notify_url);20 payInfo.setTrade_type("JSAPI");21 payInfo.setOpenid(openId);22 return payInfo;23 }
獲取簽名:
1 /** 2 * 獲取簽名 3 * @param payInfo 4 * @return 5 * @throws Exception 6 */ 7 public String getSign(PayInfo payInfo) throws Exception { 8 String signTemp = "appid="+payInfo.getAppid() 9 +"&attach="+payInfo.getAttach()10 +"&body="+payInfo.getBody()11 +"&device_info="+payInfo.getDevice_info()12 +"&mch_id="+payInfo.getMch_id()13 +"&nonce_str="+payInfo.getNonce_str()14 +"¬ify_url="+payInfo.getNotify_url()15 +"&openid="+payInfo.getOpenid()16 +"&out_trade_no="+payInfo.getOut_trade_no()17 +"&spbill_create_ip="+payInfo.getSpbill_create_ip()18 +"&total_fee="+payInfo.getTotal_fee()19 +"&trade_type="+payInfo.getTrade_type()20 +"&key="+Constants.key; //這個key注意21 22 MessageDigest md5 = MessageDigest.getInstance("MD5");23 md5.reset();24 md5.update(signTemp.getBytes("UTF-8"));25 String sign = CommonUtil.byteToStr(md5.digest()).toUpperCase();26 return sign;27 }
注意:上面的Constants.key取值在商戶號API安全的API密鑰中。
一些工具方法:獲取ip地址,將字節(jié)數(shù)組轉(zhuǎn)換為十六進制字符串,將字節(jié)轉(zhuǎn)換為十六進制字符串
1 /** 2 * 將字節(jié)數(shù)組轉(zhuǎn)換為十六進制字符串 3 * 4 * @param byteArray 5 * @return 6 */ 7 public static String byteToStr(byte[] byteArray) { 8 String strDigest = ""; 9 for (int i = 0; i < byteArray.length; i++) {10 strDigest += byteToHexStr(byteArray[i]);11 }12 return strDigest;13 }14 15 /**16 * 將字節(jié)轉(zhuǎn)換為十六進制字符串17 * 18 * @param btyes19 * @return20 */21 public static String byteToHexStr(byte bytes) {22 char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };23 char[] tempArr = new char[2];24 tempArr[0] = Digit[(bytes >>> 4) & 0X0F];25 tempArr[1] = Digit[bytes & 0X0F];26 27 String s = new String(tempArr);28 return s;29 }30 31 /**32 * 獲取ip地址33 * @param request34 * @return35 */36 public static String getIpAddr(HttpServletRequest request) { 37 InetAddress addr = null; 38 try { 39 addr = InetAddress.getLocalHost(); 40 } catch (UnknownHostException e) { 41 return request.getRemoteAddr(); 42 } 43 byte[] ipAddr = addr.getAddress(); 44 String ipAddrStr = ""; 45 for (int i = 0; i < ipAddr.length; i++) { 46 if (i > 0) { 47 ipAddrStr += "."; 48 } 49 ipAddrStr += ipAddr[i] & 0xFF; 50 } 51 return ipAddrStr; 52 }
這樣就獲取了簽名,把簽名與PayInfo中的其他數(shù)據(jù)轉(zhuǎn)成XML格式,當(dāng)做參數(shù)傳遞給統(tǒng)一下單地址。
1 PayInfo pi = pu.createPayInfo(bo,"10.204.3.32","22");2 String sign = pu.getSign(pi);3 pi.setSign(sign);
對象轉(zhuǎn)XML
1 /** 2 * 擴展xstream使其支持CDATA 3 */ 4 private static XStream xstream = new XStream(new XppDriver() { 5 public HierarchicalStreamWriter createWriter(Writer out) { 6 return new PrettyPrintWriter(out) { 7 //增加CDATA標(biāo)記 8 boolean cdata = true; 9 10 @SuppressWarnings("rawtypes")11 public void startNode(String name, Class clazz) {12 super.startNode(name, clazz);13 }14 15 protected void writeText(QuickWriter writer, String text) {16 if (cdata) {17 writer.write("<![CDATA[");18 writer.write(text);19 writer.write("]]>");20 } else {21 writer.write(text);22 }23 }24 };25 }26 });27 28 public static String payInfoToXML(PayInfo pi) {29 xstream.alias("xml", pi.getClass());30 return xstream.toXML(pi);31 }
xml轉(zhuǎn)Map
1 @SuppressWarnings("unchecked") 2 public static Map<String, String> parseXml(String xml) throws Exception { 3 Map<String, String> map = new HashMap<String, String>(); 4 5 Document document = DocumentHelper.parseText(xml); 6 Element root = document.getRootElement(); 7 List<Element> elementList = root.elements(); 8 9 for (Element e : elementList)10 map.put(e.getName(), e.getText());11 return map;12 }
下面就是調(diào)用統(tǒng)一下單的URL了
1 log.info(MessageUtil.payInfoToXML(pi).replace("__", "_"));2 Map<String, String> map = CommonUtil.httpsRequestToXML("https://api.mch.weixin.qq.com/pay/unifiedorder", "POST", MessageUtil.payInfoToXML(pi).replace("__", "_").replace("<![CDATA[", "").replace("]]>", ""));3 log.info(map);
1 public static Map<String, String> httpsRequestToXML(String requestUrl, String requestMethod, String outputStr) { 2 Map<String, String> result = new HashMap<>(); 3 try { 4 StringBuffer buffer = httpsRequest(requestUrl, requestMethod, outputStr); 5 result = MessageUtil.parseXml(buffer.toString()); 6 } catch (ConnectException ce) { 7 log.error("連接超時:"+ce.getMessage()); 8 } catch (Exception e) { 9 log.error("https請求異常:"+ece.getMessage());10 }11 return result;12 }
httpsRequest()這個方法在第一篇中
上面獲取到的Map如果成功的話,里面就會有
1 String return_code = map.get("return_code"); 2 if(StringUtils.isNotBlank(return_code) && return_code.equals("SUCCESS")){ 3 String return_msg = map.get("return_msg"); 4 if(StringUtils.isNotBlank(return_msg) && !return_msg.equals("OK")) { 5 return "統(tǒng)一下單錯誤!"; 6 } 7 }else{ 8 return "統(tǒng)一下單錯誤!"; 9 }10 11 String prepay_Id = map.get("prepay_id");
這個prepay_id就是預(yù)支付的ID。后面支付需要它。
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