微信支付统一下单 android端微信支付V3版本地签名统一下单详解
失足小葩葩 人气:0想了解android端微信支付V3版本地签名统一下单详解的相关内容吗，失足小葩葩在本文为您仔细讲解微信支付统一下单的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：微信支付统一下单demo,微信支付统一下单，下面大家一起来学习吧。
满满的都是坑，因为服务器偷懒让客服端写统一下单，服务器只给了通知的url。微信的支付demo并没有统一下单的代码。
读此文前先阅读： http://pay.weixin.qq.com/wiki/doc/api/app/app.PHP?chapter=9_1
一步步的来 先根据统一下单的参数介绍工具：
1. 获取到当前的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() {
//获取wifi服务
WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
//判断wifi是否开启
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.随机订单号生成 test 你们可根据自己生成随机数：
<span style="font-size:14px;">private String genOutTradNo() {
Random random = new Random();
return MD5.getMessageDigest(String.valueOf(random.nextInt(10000)).getBytes());
}</span>
3.签名工具：
<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 现在我们需要生成传递的参数 参数要求是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>
得到传递的参数，根据文档指示，我们需要用post去吊连接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){
//实例化student对象
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>
下单完成，第二部就是给微信支付传递调起微信支付的参数（具体参数看文档说明）：
<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，调微信支付：
<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 在开发者平台获取
<span style="font-size:14px;"> req.partnerId = Constants.MCH_ID;</span>
商户id
<span style="font-size:14px;">ConfigUtil.NOTIFY_URL</span>
支付后的回调通知地址。
签名两次，然后用的api——key是商户平台api安全里面自定义的。
对了 还有个获取时间工具
<span style="font-size:14px;">private long genTimeStamp() {
return System.currentTimeMillis() / 1000;
}</span>
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