android端微信支付V3版本地簽名統一下單詳解_Android

滿滿的都是坑，因為伺服器偷懶讓客服端寫統一下單，伺服器只給了通知的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. 擷取到當前的ip：

<span style="font-size:14px;">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() {     //擷取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.隨機訂單號產生 test 你們可根據自己產生隨機數：

<span style="font-size:14px;">private String genOutTradNo() {     Random random = new Random();     return MD5.getMessageDigest(String.valueOf(random.nextInt(10000)).getBytes());   }</span> 

3.簽名工具：

<span style="font-size:14px;">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  現在我們需要產生傳遞的參數   參數要求是xml 格式的：

<span style="font-size:14px;">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 style="font-size:14px;">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去吊串連URL地址：https://api.mch.weixin.qq.com/pay/unifiedorder：

<span style="font-size:14px;">  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 style="font-size:14px;">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){               //執行個體化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 style="font-size:14px;">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 style="font-size:14px;">private void sendPayReq() {     msgApi.registerApp(Constants.APP_ID);     msgApi.sendReq(req);   }</span> 

 其中：

 <span style="font-size:14px;">Constants.APP_ID</span> 

是appid 在開發人員平台擷取

<span style="font-size:14px;">    req.partnerId = Constants.MCH_ID;</span> 

商戶id

<span style="font-size:14px;">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安全裡面自訂的。

對了 還有個擷取時間工具

<span style="font-size:14px;">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協助，也希望大家多多支援雲棲社區。