[支付]微信NATIVE扫码支付JAVA实现
步骤：
1.预订单
2.接受微信返回的url
3.将url转为二维码显示到页面上
4.扫码支付
5.接收微信的异步通知，在这步修改订单的状态
6.收到异步通知的同时给微信返回指定数据，告知对方已成功处理异步通知
难点：
1.根据传递的参数生成签名
2.将数据转为xml格式发送给微信预订单接口
常见错误：
1.签名错误（推荐用微信的验签工具检验）
2.xml格式错误（很有可能是发送数据的方式出现了问题）
具体实现：
1.预订单
public String getImageUrl(String body,String out_trade_no,String product_id,String total_fee) throws Exception{ Map<String, Object> paramMap = new HashMap<String, Object>(); paramMap.put("appid", data.getAppid()); //appid：每个公众号都有一个appid paramMap.put("body", body); //商品描述 paramMap.put("mch_id", data.getMch_id()); //商户号：开通微信支付后分配 paramMap.put("nonce_str", RandomStringGenerator.getRandomStringByLength(32)); // 随机字符串 paramMap.put("notify_url", data.getNotify_url()); //支付成功后，回调地址 paramMap.put("out_trade_no", out_trade_no); //商户订单号 paramMap.put("product_id", product_id); // 商户根据自己业务传递的参数 当trade_type=NATIVE时必填 paramMap.put("spbill_create_ip", this.localIp()); //本机的Ip paramMap.put("total_fee", total_fee); //金额必须为整数 单位为分 paramMap.put("trade_type", data.getTrade_type()); //交易类型 paramMap.put("sign", WxzfUtil.getSign(paramMap, WXPayAction.KEY));//根据微信签名规则，生成签名。随机参数可以在商户后台管理系统中进行设置。 String xmlData = XmlUtils.map2xmlBody(paramMap,"xml");//把参数转换成XML数据格式 String codeUrl = getCodeUrl(xmlData); //获取二维码链接 return codeUrl; }
public static String getSign(Map map, String key) throws Exception { String signTemp = "appid=" + map.get("appid") + "&body=" + map.get("body") + "&mch_id=" + map.get("mch_id") + "&nonce_str=" + map.get("nonce_str") + "¬ify_url=" + map.get("notify_url") + "&out_trade_no=" + map.get("out_trade_no") + "&product_id=" + map.get("product_id") + "&spbill_create_ip=" + map.get("spbill_create_ip") + "&total_fee=" + map.get("total_fee") + "&trade_type=" + map.get("trade_type") + "&key=" + key; String sign = MD5.MD5Encode(signTemp).toUpperCase();//MD5微信接口中提供，直接调用即可 return sign; }
public static String map2xmlBody(Map<String, Object> vo, String rootElement) { org.dom4j.Document doc = DocumentHelper.createDocument(); Element body = DocumentHelper.createElement(rootElement); doc.add(body); __buildMap2xmlBody(body, vo); return doc.asXML(); } @SuppressWarnings("unchecked") private static void __buildMap2xmlBody(Element body, Map<String, Object> vo) { if (vo != null) { Iterator<String> it = vo.keySet().iterator(); while (it.hasNext()) { String key = (String) it.next(); if (StringUtil.isNotEmpty(key)) { Object obj = vo.get(key); Element element = DocumentHelper.createElement(key); if (obj != null) { if (obj instanceof java.lang.String) { element.setText((String) obj); } else { if (obj instanceof java.lang.Character || obj instanceof java.lang.Boolean || obj instanceof java.lang.Number || obj instanceof java.math.BigInteger || obj instanceof java.math.BigDecimal) { org.dom4j.Attribute attr = DocumentHelper.createAttribute(element, "type", obj.getClass().getCanonicalName()); element.add(attr); element.setText(String.valueOf(obj)); } else if (obj instanceof java.util.Map) { org.dom4j.Attribute attr = DocumentHelper.createAttribute(element, "type", java.util.Map.class.getCanonicalName()); element.add(attr); __buildMap2xmlBody(element, (Map<String, Object>) obj); } else { } } } body.add(element); } } } }
/** * 获取一定长度的随机字符串 * @param length 指定字符串长度 * @return 一定长度的字符串 */ public static String getRandomStringByLength(int length) { String base = "abcdefghijklmnopqrstuvwxyz0123456789"; Random random = new Random(); StringBuffer sb = new StringBuffer(); for (int i = 0; i < length; i++) { int number = random.nextInt(base.length()); sb.append(base.charAt(number)); } return sb.toString(); }
//获取本机ip地址 @SuppressWarnings("rawtypes") private String localIp(){ String ip = null; Enumeration allNetInterfaces; try { allNetInterfaces = NetworkInterface.getNetworkInterfaces(); while (allNetInterfaces.hasMoreElements()) { NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement(); List<InterfaceAddress> InterfaceAddress = netInterface.getInterfaceAddresses(); for (InterfaceAddress add : InterfaceAddress) { InetAddress Ip = add.getAddress(); if (Ip != null && Ip instanceof Inet4Address) { ip = Ip.getHostAddress(); } } } } catch (SocketException e) { log.warn("获取本机Ip失败:异常信息:"+e.getMessage()); } return ip; }
2.接受微信返回的url
/** * 获取二维码链接 * @param xmlData * @return */ private String getCodeUrl(String xmlData) { String resXml = null; try { resXml = WxzfUtil.sendPost(WXPayAction.WX_CREATE_ORDER_URL, xmlData); } catch (UnrecoverableKeyException e1) { log.error(e1.getMessage()); } catch (KeyManagementException e1) { log.error(e1.getMessage()); } catch (KeyStoreException e1) { log.error(e1.getMessage()); } catch (NoSuchAlgorithmException e1) { log.error(e1.getMessage()); } catch (IOException e1) { log.error(e1.getMessage()); } String code_url = ""; Map<String, String> map; try { map = WxzfUtil.parseXml(resXml); Object returnCode = map.get("return_code"); if("SUCCESS".equals(returnCode)) { Object resultCode = map.get("result_code"); if("SUCCESS".equals(resultCode)) { code_url = map.get("code_url").toString(); } } } catch (Exception e) { log.error(e.getMessage()); return ""; } return code_url; }
//将xml数据发送给微信 @SuppressWarnings({ "resource" }) public static String sendPost(String url, String postDataXML) throws IOException, KeyStoreException, UnrecoverableKeyException, NoSuchAlgorithmException, KeyManagementException { String result = null; HttpPost httpPost = new HttpPost(url); HttpClient client = new DefaultHttpClient(); // 得指明使用UTF-8编码，否则到API服务器XML的中文不能被成功识别 StringEntity postEntity = new StringEntity(postDataXML, "UTF-8"); httpPost.addHeader("Content-Type", "text/xml"); httpPost.setEntity(postEntity); try { HttpResponse response = client.execute(httpPost); HttpEntity entity = response.getEntity(); result = EntityUtils.toString(entity, "UTF-8"); } catch (ConnectionPoolTimeoutException e) { // LOG.debug("http get throw ConnectionPoolTimeoutException(wait time out)"); } catch (ConnectTimeoutException e) { // LOG.debug("http get throw ConnectTimeoutException"); } catch (SocketTimeoutException e) { // LOG.debug("http get throw SocketTimeoutException"); } catch (Exception e) { e.printStackTrace(); // LOG.debug("http get throw Exception" ); } finally { httpPost.abort(); } System.out.println(result); return result; }
3.将url转为二维码显示到页面上
public String payWeChat(String ids,String content,HttpServletResponse response,HttpServletRequest request, ModelMap model){ WebErrors errors = WebErrors.create(request); try { OmShopOrder order = orderService.findById(Long.parseLong(ids)); content = this.getImageUrl(order.getSoProductname(), order.getSoId().toString(), order.getSoId().toString(), (int)(order.getSoTotal()*10*10)+""); MultiFormatWriter multiFormatWriter = new MultiFormatWriter(); Hashtable hints = new Hashtable(); hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 400, 400,hints); response.setContentType("image/jpeg"); MatrixToImageWriter.writeToStream(bitMatrix, "jpg", response.getOutputStream()); } catch (Exception e) { e.printStackTrace(); log.warn("订单已支付，请勿重新支付"); } return null; }
4.扫码支付
5.接收微信的异步通知，在这步修改订单的状态
if ("SUCCESS".equals(returnMap.get("return_code"))&&"SUCCESS".equals(returnMap.get("result_code"))) { //处理你的业务逻辑代码（修改订单支付状态） }
6.收到异步通知的同时给微信返回指定数据，告知对方已成功处理异步通知
response.setContentType("text/plain;charset=UTF-8");
PrintWriter writer;
try {
writer = response.getWriter();
writer.write("<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>");
writer.flush();
} catch (IOException e) {
e.printStackTrace();
}
