android端微信支付V3版本地签名统一下单详解

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：

public String getLocalIpAddress() { 
    try { 
      for (Enumeration en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements(); ) { 
 NetworkInterface intf = en.nextElement(); 
 for (Enumeration 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); 
  }

2.随机订单号生成 test 你们可根据自己生成随机数：

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

3.签名工具：

private String genAppSign(List 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 strn"+sb.toString()+"nn"); 
    String appSign = MD5.getMessageDigest(sb.toString().getBytes()); 
    Log.e("orion",appSign); 
    return appSign; 
  }

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：

private String genProductArgs() { 
    StringBuffer xml = new StringBuffer(); 
    String ip = getWifiIp(); 
    if (ip == "" && ip == "") { 
      ip = getLocalIpAddress(); 
    } 
    try { 
      String nonceStr = genNonceStr(); 
      xml.append(""); 
      List packageParams = new linkedList(); 
      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; 
    } 
  }

其中 toxml：

private String toXml(List params) { 
    StringBuilder sb = new StringBuilder(); 
    sb.append(""); 
    for (int i = 0; i < params.size(); i++) { 
      sb.append("<"+params.get(i).getName()+">"); 
 
 
      sb.append(params.get(i).getValue()); 
      sb.append(""); 
    } 
    sb.append(""); 
 
    Log.e("orion",sb.toString()); 
    return sb.toString(); 
  }

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：

  private class GetPrepayIdTask extends AsyncTask> { 
 
    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 result) { 
      if (dialog != null) { 
 dialog.dismiss(); 
      } 
      sb.append("prepay_idn"+result.get("prepay_id")+"nn"); 
 
      resultunifiedorder=result; 
 
    } 
 
    @Override 
    protected void onCancelled() { 
      super.onCancelled(); 
    } 
 
    @Override 
    protected Map 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 xml=decodeXml(content); 
 
      return xml; 
    } 
  }

其中decodexml就是：

 public Map decodeXml(String content) { 
 
    try { 
      Map xml = new HashMap(); 
      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; 
 
  }

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）：

 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 signParams = new linkedList(); 
    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("signn"+req.sign+"nn"); 
 
    Log.e("orion", signParams.toString()); 
 
  }

第三部，调微信支付：

 private void sendPayReq() { 
    msgApi.registerApp(Constants.APP_ID); 
    msgApi.sendReq(req); 
  }

其中：

 Constants.APP_ID

是appid 在开发者平台获取

    req.partnerId = Constants.MCH_ID;

商户id

ConfigUtil.NOTIFY_URL

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

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

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考高分网。

android端微信支付V3版本地签名统一下单详解

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