微信支付V3版本地簽名統一下單android端詳解
阿新 • • 發佈：2019-01-08
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並沒有統一下單的程式碼。
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 先根據統一下單的引數介紹工具：
1. 獲取到當前的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() { //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 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 現在我們需要生成傳遞的引數 引數要求是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>得到傳遞的引數，根據文件指示，我們需要用post去吊連線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){
//例項化student物件
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引數（具體引數看文件說明）：
<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><span style="font-size:14px;"> req.partnerId = Constants.MCH_ID;</span><span style="font-size:14px;">ConfigUtil.NOTIFY_URL</span>簽名兩次，然後用的api——key是商戶平臺api安全裡面自定義的。
對了 還有個獲取時間工具
<span style="font-size:14px;">private long genTimeStamp() {
return System.currentTimeMillis() / 1000;
}</span>下載連結 http://download.csdn.net/detail/meijuanyou/9571223 不明白就留言 共同進步