小程序微信支付[JSAPI]

作者：admin来源：自编日期：2021/2/24 16:59:21浏览次数：

这里说的小程序微信支付是其程序方说明的JSAPI方式，即按支付按钮后，会出现输入支付密码的样式。

微信小程序页面分4个部分：js、json、wxml、wxss，各负责一部分内容。

js（逻辑部分）支付按钮函数（bindtap）可以是：//页面中需要定义支付按钮

pay: function (options) {

var orderCode = this.getorderid();//可以定义一个获取订单号的函数;

var that=this;

var selfsession = wx.getStorageSync("selfsession");//根据selfsession获取id,selfsession为自定义变量；selfsession的使用方法可参考文章-小程序获取session方法

wx.login({

success: function (res) {

if (res.code) {

wx.request({

url: "https://www.xxxx.cn/xxx.ashx",

data: {

code: res.code,

order_code: orderCode,//相应参数在此规划好

total_fee: "",

body:"",

……

method: 'POST',

header: {'content-type': 'application/x-www-form-urlencoded'},

success: function(res) {

console.log(res.data);

wx.requestPayment({

timeStamp:res.data.timeStamp,

nonceStr:res.data.nonceStr,

package:res.data.package,

signType:res.data.signType,

paySign:res.data.paySign,

success: function(res) {

console.log(res); |#|#|

wx.request({ //更新付款状态及录入订单号、订单金额等

url: "https://www.xxxx.cn/xxx.ashx",

method: "POST",

header: { "Content-Type": "application/x-www-form-urlencoded" },

data: {

success: function (res) {

fail: function (res) {

})

fail: function(res) {

console.log("支付失败：",res);

})

}

})

}

})

后方函数，需要一系列函数支撑，这里用.NET需要定义一个微信支付类WXPay。

后方在接到命令后，处理函数如下，s是需要返回给前方的字符串。

try{

string code = context.Request.Form["code"];

string order_code = context.Request.Form["order_code"];

string body = context.Request.Form["body"];

string total_fee = context.Request.Form["total_fee"];

WXPay.PayRequesEntity msg = (WXPay.PayRequesEntity)WXPay.Pay(code, order_code,total_fee,body);

if (msg != null){|#|#|

s = "{\"state\":\"OK\",\"Error_code\":\"0\",\"Success\":\"" + true + "\",\"Message\":\"支付结果！\",\"Total_count\":\""+total_fee+"\",\"timeStamp\":\"" + msg.timeStamp + "\",\"nonceStr\":\"" + msg.nonceStr + "\",\"package\":\"" + msg.package + "\",\"signType\":\"" + msg.signType + "\",\"paySign\":\"" + msg.paySign + "\"}";

}

else

{s = "{\"state\":\"none\"}";}

}

catch (Exception e){

s = "{\"state\":\"none\",\"Error_code\":\"1\",\"Success\":\"" + false + "\",\"Message\":\"发起支付失败！\",\"Error_desc\":\"" + e.Message + "\"}";

}

微信支付类WXPay 如下：

public class WXPay{

private static string APP_ID = "";/*以下是小程序及商户号相关信息。*/

private static string APP_SECRET = "";

private static string MCH_ID = "";

private static string KEY = "";

private static string NOTIFY_URL = "https://www.xxxx.cn/xxx.aspx";

private static string PAY_URL = https://api.mch.weixin.qq.com/pay/unifiedorder;

public class Parameters {

public string appid;//申请的appid

public string mchid;//申请的商户号

public string nonce_str; //随机字符串

public string notify_url;//支付结果回调接口

public string body;//商品描述(商品简单描述，该字段请按照规范传递，具体参见参数规定)

public string out_trade_no;//商户订单号

public string total_fee;//标价金额

public string spbill_create_ip;//终端IP

public string trade_type;//交易类型

public string key;//在商家后台设置的密钥

public string app_secret;//在配置小程序时的密钥

}|#|#|

public class PayRequesEntity {

public string timeStamp { get; set; }

public string nonceStr { get; set; }

public string package { get; set; }

public string signType { get; set; }

public string paySign { get; set; }

}

public static PayRequesEntity Pay(string code, string order_code,string total_fee,string body) { /*获取微信最后支付返回值object*/

Parameters para = new Parameters();

para.appid = APP_ID;

para.mchid = MCH_ID;

para.nonce_str = GetNoncestr();

para.notify_url = NOTIFY_URL;

para.body = body;

para.out_trade_no = order_code;

para.total_fee = total_fee;

para.spbill_create_ip = "";

para.trade_type = "JSAPI";

para.key = KEY;

para.app_secret = APP_SECRET;

JObject jObject = GetOpendidAndSessionkey(code);//用code换取opendid获取用户唯一标识

string openid = string.Empty;

string session_key = string.Empty;

if (jObject.Property("openid") != null && jObject.Property("session_key") != null) {

openid = jObject["openid"].ToString();

session_key = jObject["session_key"].ToString();

}

string param = "";

if (!string.IsNullOrEmpty(openid)){ //获取统一的下单的请求参数

param = GetUnifiedOrderParam(openid, para); //获取统一下单，传给微信服务器的参数，xml格式

String msg = PostUnifiedOrder(PAY_URL, param); //统一下单后，返回的值预支付的prepay_id |#|#|

var payRes = XDocument.Parse(msg);

var root = payRes.Element("xml");

if (root.Element("return_code").Value == "SUCCESS"){

//拿到请求的结果 //序列化相应参数返回给小程序

var res = GetPayRequestParam(root, para.appid, para.key);//返回给小程序，最后要支付的值，5个值

return res;

}

return null;

}

public static JObject GetOpendidAndSessionkey(string code){

string backMsg = "";

String url = "https://api.weixin.qq.com/sns/jscode2session";

String sendData = "appid=" + APP_ID + "&secret=" + APP_SECRET + "&js_code=" + code + "&grant_type=authorization_code";

try{

System.Net.WebRequest httpRquest = System.Net.HttpWebRequest.Create(url);

httpRquest.Method = "POST";

httpRquest.ContentType = "application/x-www-form-urlencoded;charset=UTF-8";

byte[] dataArray = System.Text.Encoding.UTF8.GetBytes(sendData);

//httpRquest.ContentLength = dataArray.Length;

System.IO.Stream requestStream = null;

if (string.IsNullOrWhiteSpace(sendData) == false)

{ requestStream = httpRquest.GetRequestStream();

requestStream.Write(dataArray,0,dataArray.Length);

requestStream.Close();

}

System.Net.WebResponse response = httpRquest.GetResponse();

System.IO.Stream responseStream = response.GetResponseStream();

System.IO.StreamReader reader = new System.IO.StreamReader(responseStream, System.Text.Encoding.UTF8);

backMsg = reader.ReadToEnd();

reader.Close();|#|#|

reader.Dispose();

requestStream.Dispose();

responseStream.Close();

responseStream.Dispose();

}

catch (Exception){

throw;

}

JObject jo = JObject.Parse(backMsg);

return jo;

}

private static string GetUnifiedOrderParam(string openid, Parameters para){

//参与统一下单签名的参数，除最后的key外，已经按参数名ASCII码从小到大排序

string unifiedorderSignParam = string.Format("appid={0}&body={1}&mch_id={2}&nonce_str={3}&notify_url={4}&openid={5}&out_trade_no={6}&spbill_create_ip={7}&total_fee={8}&trade_type={9}&key={10}", para.appid, para.body, para.mchid, para.nonce_str, para.notify_url, openid, para.out_trade_no, para.spbill_create_ip, para.total_fee, para.trade_type, para.key);

//MD5加密并将结果转换成大写

string unifiedorderSign = GetMD5(unifiedorderSignParam).ToUpper();

//构造统一下单的请求参数

return string.Format(@"<xml>

<mch_id>{2}</mch_id>

<nonce_str>{3}</nonce_str>

<notify_url>{4}</notify_url>

<out_trade_no>{6}</out_trade_no>

<spbill_create_ip>{7}</spbill_create_ip>

<total_fee>{8}</total_fee>

<trade_type>{9}</trade_type>

</xml>", para.appid, para.body, para.mchid, para.nonce_str, para.notify_url, openid, para.out_trade_no, para.spbill_create_ip, para.total_fee, para.trade_type,unifiedorderSign);

}|#|#|

//统一请求下单

private static String PostUnifiedOrder(string payUrl, string para){

string result = string.Empty;

try {

System.Net.WebRequest httpRquest = System.Net.HttpWebRequest.Create(payUrl);

httpRquest.Method = "POST";

httpRquest.ContentType = "application/x-www-form-urlencoded;charset=UTF-8";

byte[] dataArray = System.Text.Encoding.UTF8.GetBytes(para);

//httpRquest.ContentLength = dataArray.Length;

System.IO.Stream requestStream = null;

if (string.IsNullOrWhiteSpace(para) == false)

{

requestStream = httpRquest.GetRequestStream();

requestStream.Write(dataArray,0,dataArray.Length);

requestStream.Close();

}

System.Net.WebResponse response = httpRquest.GetResponse();

System.IO.Stream responseStream = response.GetResponseStream();

System.IO.StreamReader reader = new System.IO.StreamReader(responseStream, System.Text.Encoding.UTF8);

result = reader.ReadToEnd();

reader.Close();

reader.Dispose();

requestStream.Dispose();

responseStream.Close();

responseStream.Dispose();

return result;

}

catch (Exception e) {

result = e.Message;

}

return result;

}|#|#|

//获取返回给小程序的支付参数

private static PayRequesEntity GetPayRequestParam(XElement root, string appid, string key) {

//当return_code 和result_code都为SUCCESS时才有我们要的prepay_id

if (root.Element("return_code").Value == "SUCCESS" && root.Element("result_code").Value == "SUCCESS"){

var package = "prepay_id=" + root.Element("prepay_id").Value;//统一下单接口返回的 prepay_id 参数值

var nonceStr = GetNoncestr();//获取随机字符串

var signType = "MD5";//加密方式

var timeStamp = Convert.ToInt64((DateTime.Now - new DateTime(1970, 1, 1)).TotalSeconds).ToString();//时间戳

var paySignParam = string.Format("appId={0}&nonceStr={1}&package={2}&signType={3}&timeStamp={4}&key={5}",appid, nonceStr, package, signType, timeStamp, key); //二次加签

var paySign = GetMD5(paySignParam).ToUpper();

PayRequesEntity payEntity = new PayRequesEntity{

package = package,

nonceStr = nonceStr,

paySign = paySign,

signType = signType,

timeStamp = timeStamp

};

return payEntity;

}

return null;

}

private static string GetNoncestr() {//获取随机字符串函数

int CodeCount = 10;

string allChar = "1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,i,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";

string[] allCharArray = allChar.Split(',');

string RandomCode = "";

int temp = -1;

Random rand = new Random();

for (int i = 0; i < CodeCount; i++){

if (temp != -1)

{|#|#|

rand = new Random(temp * i * ((int)DateTime.Now.Ticks));

}

int t = rand.Next(allCharArray.Length - 1);

while (temp == t){

t = rand.Next(allCharArray.Length - 1);

}

temp = t;

RandomCode += allCharArray[t];

}

return RandomCode;

}

/* MD5算法，不同的算法结果不一样，下面这个是可行的*/

public static string GetMD5(string sDataIn){

System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();

byte[]byt, bytHash;

byt = System.Text.Encoding.UTF8.GetBytes(sDataIn);

bytHash = md5.ComputeHash(byt);

md5.Clear();

string sTemp = "";

for (int i = 0; i < bytHash.Length; i ++ ){

sTemp += bytHash[i].ToString("x").PadLeft(2, '0');

}

return sTemp;

}

在using命名空间中，相应的命名空间要引入

要引用外部Newtonsoft.Json程序集用于json字符串及对象之间转化，外部下载

using Newtonsoft.Json.Linq;


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