微信支付V3版本地签名统一下单android端详解

最新推荐文章于 2025-03-30 13:23:43 发布

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最新推荐文章于 2025-03-30 13:23:43 发布

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分类专栏： android 文章标签： android 微信支付统一下单本地签名

本文链接：https://blog.youkuaiyun.com/meijuanyou/article/details/51863720

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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 https://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>

下载链接 http://download.youkuaiyun.com/detail/meijuanyou/9571223 不明白就留言共同进步