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：
<spanstyle="font-size:14px;">publicStringgetLocalIpAddress(){
try{
for(Enumeration<NetworkInterface>en=NetworkInterface.getNetworkInterfaces();en.hasMoreElements();){
NetworkInterfaceintf=en.nextElement();
for(Enumeration<InetAddress>enumIpAddr=intf.getInetAddresses();enumIpAddr.hasMoreElements();){
InetAddressinetAddress=enumIpAddr.nextElement();
if(!inetAddress.isLoopbackAddress()){
returninetAddress.getHostAddress().toString();
}
}
}
}catch(SocketExceptionex){
}
returnnull;
}
privateStringgetWifiIp(){
//获取wifi服务
WifiManagerwifiManager=(WifiManager)getSystemService(Context.WIFI_SERVICE);
//判断wifi是否开启
if(!wifiManager.isWifiEnabled()){
wifiManager.setWifiEnabled(true);
}
WifiInfowifiInfo=wifiManager.getConnectionInfo();
intipAddress=wifiInfo.getIpAddress();
Stringip=intToIp(ipAddress);
returnip;
}
privateStringintToIp(inti){
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：
<spanstyle="font-size:14px;">privateStringgenOutTradNo(){
Randomrandom=newRandom();
returnMD5.getMessageDigest(String.valueOf(random.nextInt(10000)).getBytes());
}</span>
3.签名工具：
<spanstyle="font-size:14px;">privateStringgenAppSign(List<NameValuePair>params){
StringBuildersb=newStringBuilder();
for(inti=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("signstr\n"+sb.toString()+"\n\n");
StringappSign=MD5.getMessageDigest(sb.toString().getBytes());
Log.e("orion",appSign);
returnappSign;
}</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：
<spanstyle="font-size:14px;">privateStringgenProductArgs(){
StringBufferxml=newStringBuffer();
Stringip=getWifiIp();
if(ip==""&&ip==""){
ip=getLocalIpAddress();
}
try{
StringnonceStr=genNonceStr();
xml.append("</xml>");
List<NameValuePair>packageParams=newLinkedList<NameValuePair>();
packageParams.add(newBasicNameValuePair("appid",Constants.APP_ID));
packageParams.add(newBasicNameValuePair("body","APPpaytest"));
packageParams.add(newBasicNameValuePair("mch_id",Constants.MCH_ID));
packageParams.add(newBasicNameValuePair("nonce_str",nonceStr));
packageParams.add(newBasicNameValuePair("notify_url",ConfigUtil.NOTIFY_URL));
packageParams.add(newBasicNameValuePair("out_trade_no",genOutTradNo()));
packageParams.add(newBasicNameValuePair("spbill_create_ip",ip));
packageParams.add(newBasicNameValuePair("total_fee","1"));
packageParams.add(newBasicNameValuePair("trade_type","APP"));
Stringsign=genPackageSign(packageParams);
packageParams.add(newBasicNameValuePair("sign",sign));
Stringxmlstring=toXml(packageParams);
returnxmlstring;
}catch(Exceptione){
Log.e("TAG","fail,ex="+e.getMessage());
returnnull;
}
}</span>
其中 toxml：
<spanstyle="font-size:14px;">privateStringtoXml(List<NameValuePair>params){
StringBuildersb=newStringBuilder();
sb.append("<xml>");
for(inti=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());
returnsb.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：
<spanstyle="font-size:14px;">privateclassGetPrepayIdTaskextendsAsyncTask<Void,Void,Map<String,String>>{
privateProgressDialogdialog;
@Override
protectedvoidonPreExecute(){
dialog=ProgressDialog.show(PayActivity.this,getString(R.string.app_tip),getString(R.string.getting_prepayid));
}
@Override
protectedvoidonPostExecute(Map<String,String>result){
if(dialog!=null){
dialog.dismiss();
}
sb.append("prepay_id\n"+result.get("prepay_id")+"\n\n");
resultunifiedorder=result;
}
@Override
protectedvoidonCancelled(){
super.onCancelled();
}
@Override
protectedMap<String,String>doInBackground(Void...params){
Stringurl=String.format("https://api.mch.weixin.qq.com/pay/unifiedorder");
Stringentity=genProductArgs();
Log.e("orion",entity);
byte[]buf=Util.httpPost(url,entity);
Stringcontent=newString(buf);
Log.e("orion",content);
Map<String,String>xml=decodeXml(content);
returnxml;
}
}</span>
其中decodexml就是：
<spanstyle="font-size:14px;">publicMap<String,String>decodeXml(Stringcontent){
try{
Map<String,String>xml=newHashMap<String,String>();
XmlPullParserparser=Xml.newPullParser();
parser.setInput(newStringReader(content));
intevent=parser.getEventType();
while(event!=XmlPullParser.END_DOCUMENT){
StringnodeName=parser.getName();
switch(event){
caseXmlPullParser.START_DOCUMENT:
break;
caseXmlPullParser.START_TAG:
if("xml".equals(nodeName)==false){
//实例化student对象
xml.put(nodeName,parser.nextText());
}
break;
caseXmlPullParser.END_TAG:
break;
}
event=parser.next();
}
returnxml;
}catch(Exceptione){
Log.e("orion",e.toString());
}
returnnull;
}</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）：
<spanstyle="font-size:14px;">privatevoidgenPayReq(){
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=newLinkedList<NameValuePair>();
signParams.add(newBasicNameValuePair("appid",req.appId));
signParams.add(newBasicNameValuePair("noncestr",req.nonceStr));
signParams.add(newBasicNameValuePair("package",req.packageValue));
signParams.add(newBasicNameValuePair("partnerid",req.partnerId));
signParams.add(newBasicNameValuePair("prepayid",req.prepayId));
signParams.add(newBasicNameValuePair("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：
<spanstyle="font-size:14px;">privatevoidsendPayReq(){
msgApi.registerApp(Constants.APP_ID);
msgApi.sendReq(req);
}</span>
其中：
<spanstyle="font-size:14px;">Constants.APP_ID</span>
是appid在开发者平台获取
<spanstyle="font-size:14px;">req.partnerId=Constants.MCH_ID;</span>
商户id
<spanstyle="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
<spanstyle="font-size:14px;">privatelonggenTimeStamp(){
returnSystem.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毛票票。