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android端微信支付V3版本地签名统一下单详解

2019年07月24日  | 移动技术网IT编程  | 我要评论

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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>

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移动技术网。

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