android端微信支付V3版本地签名统一下单详解

概述满满的都是坑，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。

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 >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 >private String genOutTradNo() {     Random random = new Random();     return MD5.getMessageDigest(String.valueOf(random.nextInt(10000)).getBytes());   }</span> 

3.签名工具：

<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  现在我们需要生成传递的参数   参数要求是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 >  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){               //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 >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 >private voID sendPayReq() {     msgAPI.registerapp(Constants.APP_ID);     msgAPI.sendReq(req);   }</span> 

 其中：

 <span >Constants.APP_ID</span> 

是appID 在开发者平台获取

<span >    req.partnerID = Constants.MCH_ID;</span> 

商户ID

<span >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 >private long genTimeStamp() {     return System.currentTimeMillis() / 1000;   }</span> 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程小技巧。

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