編輯:關於Android編程
滿滿的都是坑,因為服務器偷懶讓客服端寫統一下單,服務器只給了通知的url。微信的支付demo並沒有統一下單的代碼。
讀此文前先閱讀: https://pay.weixin.qq.com/wiki/doc/api/app/app.PHP?chapter=9_1
一步步的來 先根據統一下單的參數介紹工具:
1. 獲取到當前的ip:
<span >public String getLocalIpAddress() { try { for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements(); ) { NetworkInterface intf = en.nextElement(); for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements(); ) { InetAddress inetAddress = enumIpAddr.nextElement(); if (!inetAddress.isLoopbackAddress()) { return inetAddress.getHostAddress().toString(); } } } } catch (SocketException ex) { } return null; } private String getWifiIp() { //獲取wifi服務 WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE); //判斷wifi是否開啟 if (!wifiManager.isWifiEnabled()) { wifiManager.setWifiEnabled(true); } WifiInfo wifiInfo = wifiManager.getConnectionInfo(); int ipAddress = wifiInfo.getIpAddress(); String ip = intToIp(ipAddress); return ip; } private String intToIp(int i) { return (i & 0xFF) + "." + ((i >> 8) & 0xFF) + "." + ((i >> 16) & 0xFF) + "." + (i >> 24 & 0xFF); } </span>
2.隨機訂單號生成 test 你們可根據自己生成隨機數:
<span >private String genOutTradNo() { Random random = new Random(); return MD5.getMessageDigest(String.valueOf(random.nextInt(10000)).getBytes()); }</span>
3.簽名工具:
<span >private String genAppSign(List<NameValuePair> params) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < params.size(); i++) { sb.append(params.get(i).getName()); sb.append('='); sb.append(params.get(i).getValue()); sb.append('&'); } sb.append("key="); sb.append(Constants.API_KEY); this.sb.append("sign str\n"+sb.toString()+"\n\n"); String appSign = MD5.getMessageDigest(sb.toString().getBytes()); Log.e("orion",appSign); return appSign; }</span>
差不多了 現在我們需要生成傳遞的參數 參數要求是xml 格式的:
<span >private String genProductArgs() { StringBuffer xml = new StringBuffer(); String ip = getWifiIp(); if (ip == "" && ip == "") { ip = getLocalIpAddress(); } try { String nonceStr = genNonceStr(); xml.append("</xml>"); List<NameValuePair> packageParams = new LinkedList<NameValuePair>(); packageParams.add(new BasicNameValuePair("appid", Constants.APP_ID)); packageParams.add(new BasicNameValuePair("body", "APP pay test")); packageParams.add(new BasicNameValuePair("mch_id", Constants.MCH_ID)); packageParams.add(new BasicNameValuePair("nonce_str", nonceStr)); packageParams.add(new BasicNameValuePair("notify_url",ConfigUtil.NOTIFY_URL)); packageParams.add(new BasicNameValuePair("out_trade_no",genOutTradNo())); packageParams.add(new BasicNameValuePair("spbill_create_ip",ip)); packageParams.add(new BasicNameValuePair("total_fee", "1")); packageParams.add(new BasicNameValuePair("trade_type", "APP")); String sign = genPackageSign(packageParams); packageParams.add(new BasicNameValuePair("sign", sign)); String xmlstring =toXml(packageParams); return xmlstring; } catch (Exception e) { Log.e("TAG", "fail, ex = " + e.getMessage()); return null; } }</span>
其中 toxml:
<span >private String toXml(List<NameValuePair> params) { StringBuilder sb = new StringBuilder(); sb.append("<xml>"); for (int i = 0; i < params.size(); i++) { sb.append("<"+params.get(i).getName()+">"); sb.append(params.get(i).getValue()); sb.append("</"+params.get(i).getName()+">"); } sb.append("</xml>"); Log.e("orion",sb.toString()); return sb.toString(); }</span>
得到傳遞的參數,根據文檔指示,我們需要用post去吊連接URL地址:https://api.mch.weixin.qq.com/pay/unifiedorder:
<span > private class GetPrepayIdTask extends AsyncTask<Void, Void, Map<String,String>> { private ProgressDialog dialog; @Override protected void onPreExecute() { dialog = ProgressDialog.show(PayActivity.this, getString(R.string.app_tip), getString(R.string.getting_prepayid)); } @Override protected void onPostExecute(Map<String,String> result) { if (dialog != null) { dialog.dismiss(); } sb.append("prepay_id\n"+result.get("prepay_id")+"\n\n"); resultunifiedorder=result; } @Override protected void onCancelled() { super.onCancelled(); } @Override protected Map<String,String> doInBackground(Void... params) { String url = String.format("https://api.mch.weixin.qq.com/pay/unifiedorder"); String entity = genProductArgs(); Log.e("orion",entity); byte[] buf = Util.httpPost(url, entity); String content = new String(buf); Log.e("orion", content); Map<String,String> xml=decodeXml(content); return xml; } }</span>
其中decodexml就是:
<span >public Map<String,String> decodeXml(String content) { try { Map<String, String> xml = new HashMap<String, String>(); XmlPullParser parser = Xml.newPullParser(); parser.setInput(new StringReader(content)); int event = parser.getEventType(); while (event != XmlPullParser.END_DOCUMENT) { String nodeName=parser.getName(); switch (event) { case XmlPullParser.START_DOCUMENT: break; case XmlPullParser.START_TAG: if("xml".equals(nodeName)==false){ //實例化student對象 xml.put(nodeName,parser.nextText()); } break; case XmlPullParser.END_TAG: break; } event = parser.next(); } return xml; } catch (Exception e) { Log.e("orion",e.toString()); } return null; }</span>
下單完成,第二部就是給微信支付傳遞調起微信支付的參數(具體參數看文檔說明):
<span >private void genPayReq() { req.appId = Constants.APP_ID; req.partnerId = Constants.MCH_ID; req.prepayId = resultunifiedorder.get("prepay_id"); req.packageValue = "prepay_id="+resultunifiedorder.get("prepay_id"); req.nonceStr = genNonceStr(); req.timeStamp = String.valueOf(genTimeStamp()); List<NameValuePair> signParams = new LinkedList<NameValuePair>(); signParams.add(new BasicNameValuePair("appid", req.appId)); signParams.add(new BasicNameValuePair("noncestr", req.nonceStr)); signParams.add(new BasicNameValuePair("package", req.packageValue)); signParams.add(new BasicNameValuePair("partnerid", req.partnerId)); signParams.add(new BasicNameValuePair("prepayid", req.prepayId)); signParams.add(new BasicNameValuePair("timestamp", req.timeStamp)); req.sign = genAppSign(signParams); sb.append("sign\n"+req.sign+"\n\n"); Log.e("orion", signParams.toString()); }</span>
第三部,調微信支付:
<span >private void sendPayReq() { msgApi.registerApp(Constants.APP_ID); msgApi.sendReq(req); }</span>
其中:
<span >Constants.APP_ID</span>
是appid 在開發者平台獲取
<span > req.partnerId = Constants.MCH_ID;</span>
商戶id
<span >ConfigUtil.NOTIFY_URL</span>
支付後的回調通知地址。
簽名兩次,然後用的api——key是商戶平台api安全裡面自定義的。
對了 還有個獲取時間工具
<span >private long genTimeStamp() { return System.currentTimeMillis() / 1000; }</span>
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持本站。
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