流程
JSAPI支付和H5流程类似，只是参数不同
- 配置请求参数
- 请求下单接口
- 获取下单后返回的prepay_id参数
- 将参数赋入前端参数，调用自带方法
适用场景
适用于微信小程序内的支付环境，微信外调用将会失败
前端实例
<script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
<script src="https://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script> //调用微信CDN
<script type="text/javascript">
function pay() {
$.ajax({
async: false,
cache: false,
type: 'POST',
url: "", //请求的action路径
success: function (data) { //请求成功后处理函数。
data =JSON.parse(data);
//调起微信支付
WeixinJSBridge.invoke(
'getBrandWCPayRequest',{
"appId":data.appId, //公众号名称，由商户传入
"timeStamp":data.timeStamp,//时间戳，自1970年以来的秒数
"nonceStr":data.nonceStr, //随机串
"package":data.package,
"signType":data.signType,//微信签名方式：
"paySign":data.paySign //微信签名
},
function (res) {
if (res.err_msg == "get_brand_wcpay_request:ok") {
layer.msg("谢谢赞助");//支付成功后跳转到支付结果页面
}
else if (res.err_msg == "get_brand_wcpay_request:cancel") {
layer.msg("您取消支付");
}
else {
layer.msg("支付失败");
}
//alert(res.err_code + res.err_desc + res.err_msg);
});
}
});
};
</script>
C#后端实例
public class JSAPIPayHelper
{
static string _pre_order_url = "https://api.mch.weixin.qq.com";//请求域名
static string _appid = "";//公众账号ID
static string _mch_id = "";//商户号
static string _partnerKey = "";//商家私钥
private static dynamic GetJsApiParameters(string prepay_id)
{
var jsApiParam = new Dictionary<string, string>();
jsApiParam.Add("appId", _appid);
jsApiParam.Add("nonceStr", WxPayApi.GenerateNonceStr());
jsApiParam.Add("package", "prepay_id=" + prepay_id);
jsApiParam.Add("signType", "MD5");
jsApiParam.Add("timeStamp", WxPayApi.GenerateTimeStamp());
jsApiParam.Add("paySign", Sign(jsApiParam, _partnerKey));
string parameters = JsonConvert.SerializeObject(jsApiParam);
return parameters;
}
#region 微信支付
public static string GetJsApiPay(string openid)
{
#region 下单
var _attach = "支付测试";
var _body = "JSAPI测试";
var _nonce_str = CreateNonce_str();
var _notify_url = ""; //回调域名
var _out_trade_no = Guid.NewGuid().ToString("N");
var _spbill_create_ip = GetWebClientIp();
var _total_fee = 0.01;//元为单位
var _scene_info = $@"{{""h5_info"": {{""type"":""Wap"",""wap_url"": ""{_notify_url}"",""wap_name"": ""{_body}""}}}}";
var _time_start = DateTime.Now.ToString("yyyyMMddHHmmss");
var _time_expire = DateTime.Now.AddHours(1).ToString("yyyyMMddHHmmss");
var pre_order_httpResult = "";
var _trade_type = "JSAPI";
pre_order_httpResult = UnifiedOrder(_appid, _attach, _body, _mch_id, _nonce_str, _notify_url, _out_trade_no, _spbill_create_ip, _total_fee,
_trade_type, _scene_info, _time_start, _time_expire, openid);
var pre_order_resultStr = XElement.Parse(pre_order_httpResult);
var pre_order_result_code = pre_order_resultStr.Element("return_code").Value;
var pre_order_result_msg = pre_order_resultStr.Element("return_msg").Value;
if (pre_order_result_code == "SUCCESS")
{
var prepay_id = pre_order_resultStr.Element("prepay_id").Value;
return GetJsApiParameters(prepay_id);
}
#endregion
return string.Empty;
}
/// <summary>
/// 下单
/// </summary>
/// <param name="appid">公众账号ID</param>
/// <param name="attach">附加数据，在查询API和支付通知中原样返回，该字段主要用于商户携带订单的自定义数据</param>
/// <param name="body">String(32) 商品描述 商品或支付单简要描</param>
/// <param name="mch_id">商户号</param>
/// <param name="nonce_str">随机字符串</param>
/// <param name="notify_url">接收微信支付异步通知回调地址,不可带参,与下面的Notify对应，开发者可自定义其他url地址 </param>
/// <param name="out_trade_no">商户系统内部的订单号,32个字符内、可包含字母</param>
/// <param name="spbill_create_ip">终端ip</param>
/// <param name="total_fee">收钱总额 分为单位 前台传过来后需要处理成分</param>
/// <param name="trade_type">交易类型H5支付的交易类型为MWEB</param>
/// <param name="scene_info">场景信息 WAP网站应用{"h5_info": {"type":"Wap","wap_url": "https://pay.qq.com","wap_name": "腾讯充值"}}</param>
/// <param name="time_start">交易起始时间</param>
/// <param name="time_expire">交易结束时间</param>
/// <returns></returns>
static string UnifiedOrder(string appid, string attach, string body, string mch_id, string nonce_str, string notify_url, string out_trade_no,
string spbill_create_ip, double total_fee, string trade_type, string scene_info, string time_start, string time_expire,string
openid)
{
var stringADict = new Dictionary<string, string>();
stringADict.Add("appid", appid);
stringADict.Add("attach", attach);
stringADict.Add("body", body);
stringADict.Add("mch_id", mch_id);
stringADict.Add("nonce_str", nonce_str);
stringADict.Add("notify_url", notify_url);
stringADict.Add("openid", openid);
stringADict.Add("out_trade_no", out_trade_no);
stringADict.Add("scene_info", scene_info);
stringADict.Add("spbill_create_ip", spbill_create_ip);
stringADict.Add("total_fee", Math.Round(Convert.ToDecimal(total_fee) * 100, 0).ToString());//元转分
stringADict.Add("trade_type", trade_type);
stringADict.Add("time_start", time_start);
stringADict.Add("time_expire", time_expire);
var sign = Sign(stringADict, _partnerKey);//生成签名字符串
//组合xml内容
StringBuilder strBuilder = new StringBuilder();
strBuilder.Append("<xml>");
strBuilder.Append($"<appid>{appid}</appid>");//公众号id
strBuilder.Append($"<attach>{attach}</attach>");//附加数据
strBuilder.Append($"<body>{body}</body>");//商品描述
strBuilder.Append($"<mch_id>{mch_id}</mch_id>");//商户号
strBuilder.Append($"<nonce_str>{nonce_str}</nonce_str>");//随机字符串
strBuilder.Append($"<notify_url>{notify_url}</notify_url>");//接收微信支付异步通知回调地址,不可带参,与下面的Notify对应，开发者可自定义其他url地址
strBuilder.Append($"<openid>{openid}</openid>");
strBuilder.Append($"<out_trade_no>{out_trade_no}</out_trade_no>");//商户系统内部的订单号,32个字符内、可包含字母
strBuilder.Append($"<scene_info>{scene_info}</scene_info>");
strBuilder.Append($"<spbill_create_ip>{spbill_create_ip}</spbill_create_ip>");//终端ip
strBuilder.Append($"<total_fee>{Math.Round(Convert.ToDecimal(total_fee) * 100, 0).ToString()}</total_fee>");//收钱总额 分为单位 前台传过来后需要处理成分
strBuilder.Append($"<trade_type>{trade_type}</trade_type>");//交易类型H5支付的交易类型为MWEB
strBuilder.Append($"<time_start>{time_start}</time_start>");//交易起始时间
strBuilder.Append($"<time_expire>{time_expire}</time_expire>");//交易结束时间
strBuilder.Append($"<sign>{sign}</sign>");
strBuilder.Append("</xml>");
//var url = _pre_order_url + "/sandboxnew/pay/unifiedorder";//沙箱
var url = _pre_order_url + "/pay/unifiedorder";
var pre_order_httpResult = HttpPostRequestXml(url, strBuilder);
return pre_order_httpResult;
}
/// <summary>
/// 发送post xml文件请求
/// </summary>
/// <param name="Url"></param>
/// <param name="strBuilder"></param>
/// <returns></returns>
static string HttpPostRequestXml(string Url, StringBuilder strBuilder)
{
string result = string.Empty;
string data = strBuilder.ToString();
//进行utf-8编码
var encoding = Encoding.GetEncoding("utf-8");
byte[] buffer = encoding.GetBytes(data);
//根据webURL创建HttpWebRequest对象
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
request.Method = "post";
//request.Headers.Add("charset:utf-8");
request.ContentLength = buffer.Length;
request.ContentType = "text/xml";
StreamWriter myWriter = null;
try
{
myWriter = new StreamWriter(request.GetRequestStream());
myWriter.Write(data);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
finally
{
myWriter.Close();
}
//读取服务器返回的信息
HttpWebResponse objResponse = (HttpWebResponse)request.GetResponse();
using (StreamReader sr = new StreamReader(objResponse.GetResponseStream()))
{
result = sr.ReadToEnd();
}
return result;
}
private static string[] strs = new string[]
{
"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",
"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"
};
/// <summary>
/// 创建随机字符串
/// </summary>
/// <returns></returns>
public static string CreateNonce_str()
{
Random r = new Random();
var sb = new StringBuilder();
var length = strs.Length;
for (int i = 0; i < 15; i++)
{
sb.Append(strs[r.Next(length - 1)]);
}
return sb.ToString();
}
/// <summary>
/// 获取终端IP地址
/// </summary>
/// <returns></returns>
public static string GetWebClientIp()
{
string userIP = "";
try
{
if (System.Web.HttpContext.Current == null
|| System.Web.HttpContext.Current.Request == null
|| System.Web.HttpContext.Current.Request.ServerVariables == null)
return "";
string CustomerIP = "";
//CDN加速后取到的IP simone 090805
CustomerIP = System.Web.HttpContext.Current.Request.Headers["Cdn-Src-Ip"];
if (!string.IsNullOrEmpty(CustomerIP))
{
return CustomerIP;
}
CustomerIP = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (!String.IsNullOrEmpty(CustomerIP))
{
return CustomerIP;
}
if (System.Web.HttpContext.Current.Request.ServerVariables["HTTP_VIA"] != null)
{
CustomerIP = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (CustomerIP == null)
CustomerIP = System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
}
else
{
CustomerIP = System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
}
if (string.Compare(CustomerIP, "unknown", true) == 0)
return System.Web.HttpContext.Current.Request.UserHostAddress;
return CustomerIP;
}
catch { }
return userIP;
}
/// <summary>
/// 生成签名
/// 签名在线验证工具：
/// http://mch.weixin.qq.com/wiki/tools/signverify/
/// </summary>
/// <param name="stringADict">参与签名生成的参数列表</param>
/// <param name="partnerKey">商家私钥</param>
/// <returns></returns>
public static string Sign(IDictionary<string, string> stringADict, string partnerKey)
{
var sb = new StringBuilder();
foreach (var sA in stringADict.OrderBy(x => x.Key))//参数名ASCII码从小到大排序（字典序）；
{
if (string.IsNullOrEmpty(sA.Value)) continue;//参数的值为空不参与签名；
if (string.Compare(sA.Key, "sign", true) == 0) continue; // 参数中为签名的项，不参加计算
sb.Append(sA.Key).Append("=").Append(sA.Value).Append("&");
}
var string1 = sb.ToString();
string1 = string1.Remove(string1.Length - 1, 1);
sb.Append("key=").Append(partnerKey);//在stringA最后拼接上key=(API密钥的值)得到stringSignTemp字符串
var stringSignTemp = sb.ToString();
var sign = MD5Encrypt(stringSignTemp, "UTF-8").ToUpper();//对stringSignTemp进行MD5运算，再将得到的字符串所有字符转换为大写，得到sign值signValue。
return sign;
}
/// <summary>
/// 用MD5加密字符串
/// </summary>
/// <param name="password">待加密的字符串</param>
/// <returns></returns>
public static string MD5Encrypt(string password, string encoding)
{
MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();
byte[] hashedDataBytes;
hashedDataBytes = md5Hasher.ComputeHash(Encoding.GetEncoding(encoding).GetBytes(password));
StringBuilder tmp = new StringBuilder();
foreach (byte i in hashedDataBytes)
{
tmp.Append(i.ToString("x2"));
}
return tmp.ToString();
}
#endregion
}
*注：文章部分转载。
