一、在支付前期，我们需要获取用户的OpenId，此块内容只针对于JSAPI（微信中直接支付）才需要，如果生成二维码（NATIVE）扫描支付，请跳过此步骤
思路大致是：获取用户的code值 > 根据code值再获取用户的OpenId
1、先绑定授权域名：开发者中心>网页服务>基础接口>网页授权获取用户基本信息>修改>设置网站的域名 。点击查看
2、获取用户的code值时，方式如下：
https://open.weixin.qq.com/connect/oauth2/authorize?appid=&redirect_uri=&response_type=code&scope=&state=STATE#wechat_redirect
其中APPId不用多说，redirect_uri为网站的回调地址，回调地址必须UrlEncode处理，其中返回的参数就有code值
关于网页授权的两种scope的区别说明：snsapi_base和snsapi_userinfo，scope只有这2种方式
snsapi_base是不需要用户同意的，但是回调地址中获取到的code，根据这个code只能获取用户的OpenId，像：昵称，性别等是无法获取的，但是对于微信支付足够了
snsapi_userinfo是需要用户同意才能获取code,通过code能够获取用户的基本信息，这个做微信登录比较好，但是如果客户不同意就没办法进行下边的环节了，所以微信支付不要用这个参数。
3、根据2中返回的code值，获取用户的OpenId，方法如下：
方式：POST，Url:https://api.weixin.qq.com/sns/oauth2/access_token?appid=&secret=&code=&grant_type=authorization_code"
其中code值是从2中获取到的，返回参数为json，其中有一个参数为openid。
//1.获取Code值string v = HttpContext.Current.Server.UrlEncode("http://****");string url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=&redirect_uri=" + v + "&response_type=code&scope=snsapi_base#wechat_redirect";Response.Redirect(url);string Code = base.QueryString("code");//2.获取OpenIdstring urls = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=&secret=&code=" + Code + "&grant_type=authorization_code";string openid = PostWebRequest(urls, "");/// <summary>/// 获取OpenId方法/// </summary>/// <param name="postUrl"></param>/// <param name="menuInfo"></param>/// <returns></returns>public string PostWebRequest(string postUrl, string menuInfo){ string returnValue = string.Empty; try { byte[] byteData = Encoding.UTF8.GetBytes(menuInfo); Uri uri = new Uri(postUrl); HttpWebRequest webReq = (HttpWebRequest)WebRequest.Create(uri); webReq.Method = "POST"; webReq.ContentType = "application/x-www-form-urlencoded"; webReq.ContentLength = byteData.Length; //定义Stream信息 Stream stream = webReq.GetRequestStream(); stream.Write(byteData, 0, byteData.Length); stream.Close(); //获取返回信息 HttpWebResponse response = (HttpWebResponse)webReq.GetResponse(); StreamReader streamReader = new StreamReader(response.GetResponseStream(), Encoding.Default); returnValue = streamReader.ReadToEnd(); //关闭信息 streamReader.Close(); response.Close(); stream.Close(); JsonTextParser parser = new JsonTextParser(); JsonObjectCollection obj = parser.Parse(returnValue) as JsonObjectCollection; JsonUtility.GenerateIndentedJsonText = false; string openid = obj["openid"].GetValue().ToString(); return openid; } catch (Exception ex) { return ex.ToString(); }}
二、微信支付
大致思路：微信支付>开发配置>支付授权目录 设置一个支付页面所在文件夹 点击查看相应位置
登录商户平台 > API安全 > 设置一个32位由数字和字母组成的密钥。 以上内容设置好后才可以进行支付参数的设置
1、引用微信JS http://res.wx.qq.com/open/js/jweixin-1.0.0.js
2、设置config参数
3、设置chooseWXPay参数
4、支付
这里需要强调的是，下边config和chooseWXPay中的参数名为：nonceStr、timestamp要一直，否则就会一直报错：paySign加密错误
其中package的prepay_id参数内容的获取内容为可以根据官网的要求来，但传参字段一定要小写，一定要小写！
paySign 的加密方式为chooseWXPay的参数内容：timestamp、nonceStr、package、signType、key的组合加密，加密方式 和获取prepay_id的方式一样，具体操作看代码。但是这里的加密的参数的大小写要前后台对应一直，否则加密一定错误！
加密的方式如：把所有的参数首字母从小到大传参的形式组成字符串后，把key值再拼接上，具体内容请参考微信的签名算法和微信下单的参数列表
<script src='/images/loading.gif' data-original="../js/jquery.js" type="text/javascript"></script><script src='/images/loading.gif' data-original="http://res.wx.qq.com/open/js/jweixin-1.0.0.js" type="text/javascript"></script><script type="text/javascript"> wx.config({ debug: false, // 开启调试模式,调用的所有api的返回值会在客户端alert出来，若要查看传入的参数，可以在pc端打开，参数信息会通过log打出，仅在pc端时才会打印。 appId: '<%=appids %>', // 必填，公众号的唯一标识 timestamp: "<%=Timer %>", // 必填，生成签名的时间戳 nonceStr: "<%=RdCode %>", // 必填，生成签名的随机串 signature: "<%=GetSignature() %>", // 必填，签名，见附录1 jsApiList: ['chooseWXPay'] // 必填，需要使用的JS接口列表，所有JS接口列表见附录2 }); wx.ready(function () { wx.chooseWXPay({ appId: '<%=appids %>', timestamp: '<%=Timer %>', nonceStr: '<%=RdCode %>', package: 'prepay_id=<%=prepay_id %>', signType: 'MD5', paySign: '<%=paySign %>', success: function (res) { window.location.href = "cart4.aspx?Code=<%=Code %>"; }, cancel: function () { window.location.href = "cart3.aspx?Code=<%=Code %>"; }, error: function (e) { window.location.href = "cart3.aspx?Code=<%=Code %>"; } }); });</script>public string appids = "";//这里是公众号的AppIdpublic string Code = ""; //订单号public string Timer = "";//1970年到现在的秒数public string OpenId = "";//用户的OpenIdpublic string paySign = "";//paySignpublic string RdCode = "";//随机数public string prepay_id = "";//package中prepay_id的值
public string AppSecret = "";//公众号的AppSecretprotected void Page_Load(object sender, EventArgs e){ GetTiks();
RdCode = getNoncestr().ToLower(); TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0); Timer = Convert.ToInt64(ts.TotalSeconds).ToString(); BindString();}
/// <summary>
/// 获取jsapi_ticket的值
/// </summary>
public void GetTiks()
{
string value = "";
Stream outstream = null;
Stream instream = null;
StreamReader sr = null;
HttpWebResponse response = null;
HttpWebRequest request = null;
Encoding encoding = Encoding.UTF8;
try
{
request = (HttpWebRequest)WebRequest.Create("https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=" + Get_Access_Token(appids, AppSecret) + "&type=jsapi");
CookieContainer cookieContainer = new CookieContainer();
request.CookieContainer = cookieContainer;
request.AllowAutoRedirect = true;
request.Method = "GET";
request.ContentType = "application/x-www-form-urlencoded";
response = request.GetResponse() as HttpWebResponse;
request.GetResponse();
instream = response.GetResponseStream();
sr = new StreamReader(instream, encoding);
JsonTextParser parser = new JsonTextParser();
JsonObjectCollection obj = parser.Parse(sr.ReadToEnd().Replace("[]", "null")) as JsonObjectCollection;
JsonUtility.GenerateIndentedJsonText = false;
Tiks = obj["ticket"].GetValue().ToString();
}
catch (Exception ex)
{
Tiks = "";
}
}
/// <summary>
/// 获取Access_Token值
/// </summary>
/// <param name="appid">AppId</param>
/// <param name="secret">AppSecret</param>
/// <returns></returns>
public static string Get_Access_Token(string appid, string secret)
{
string value = "";
Stream outstream = null;
Stream instream = null;
StreamReader sr = null;
HttpWebResponse response = null;
HttpWebRequest request = null;
Encoding encoding = Encoding.UTF8;
try
{
request = (HttpWebRequest)WebRequest.Create("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + appid + "&secret=" + secret + "");
CookieContainer cookieContainer = new CookieContainer();
request.CookieContainer = cookieContainer;
request.AllowAutoRedirect = true;
request.Method = "GET";
request.ContentType = "application/x-www-form-urlencoded";
response = request.GetResponse() as HttpWebResponse;
request.GetResponse();
instream = response.GetResponseStream();
sr = new StreamReader(instream, encoding);
JsonTextParser parser = new JsonTextParser();
JsonObjectCollection obj = parser.Parse(sr.ReadToEnd().Replace("[]", "null")) as JsonObjectCollection;
JsonUtility.GenerateIndentedJsonText = false;
value = obj["access_token"].GetValue().ToString();
}
catch (Exception ex)
{
value = "";
}
return value;
}
/// <summary>
/// config签名
/// </summary>
/// <returns></returns>
public string GetSignature()
{
string tmpStr = "jsapi_ticket=" + Tiks + "&noncestr=" + RdCode + "×tamp=" + Timer + "&url=" + Request.Url.ToString();
return FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "SHA1");
}
/// <summary>
/// 客户端IP
/// </summary>
/// <param name="hc"></param>
/// <returns></returns>
public string GetIP(HttpContext hc)
{
string ip = string.Empty;
try
{
if (hc.Request.ServerVariables["HTTP_VIA"] != null)
{
ip = hc.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();
}
else
{
ip = hc.Request.ServerVariables["REMOTE_ADDR"].ToString();
}
if (ip == string.Empty)
{
ip = hc.Request.UserHostAddress;
}
return ip;
}
catch
{
return "";
}
}
public static string getNoncestr()
{
Random random = new Random();
return GetMD5(random.Next(1000).ToString(), "GBK");
}
protected string getCharset()
{
return Request.ContentEncoding.BodyName;
}
/// <summary>
/// 获取prepay_id
/// </summary>
/// <param name="postUrl"></param>
/// <param name="menuInfo"></param>
/// <returns></returns>
public string PostWebRequests(string postUrl, string menuInfo)
{
string returnValue = string.Empty;
try
{
byte[] byteData = Encoding.UTF8.GetBytes(menuInfo);
Uri uri = new Uri(postUrl);
HttpWebRequest webReq = (HttpWebRequest)WebRequest.Create(uri);
webReq.Method = "POST";
webReq.ContentType = "application/x-www-form-urlencoded";
webReq.ContentLength = byteData.Length;
//定义Stream信息
Stream stream = webReq.GetRequestStream();
stream.Write(byteData, 0, byteData.Length);
stream.Close();
//获取返回信息
HttpWebResponse response = (HttpWebResponse)webReq.GetResponse();
StreamReader streamReader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
returnValue = streamReader.ReadToEnd();
//关闭信息
streamReader.Close();
response.Close();
stream.Close();
doc.Load string prepay_ids = xn.SelectSingleNode("//prepay_id").InnerText;
return prepay_ids;
//如果是二维码扫描，请返回下边的code_url，然后自己再更具内容生成二维码即可
//string code_url = xn.SelectSingleNode("//prepay_id").InnerText;
//return code_url;
}
catch (Exception ex)
{
return "";
}
}
/// <summary>
/// MD5
/// </summary>
/// <param name="encypStr"></param>
/// <param name="charset"></param>
/// <returns></returns>
public static string GetMD5(string encypStr, string charset)
{
string retStr;
MD5CryptoServiceProvider m5 = new MD5CryptoServiceProvider();
//创建md5对象
byte[] inputBye;
byte[] outputBye;
//使用GB2312编码方式把字符串转化为字节数组．
try
{
inputBye = Encoding.GetEncoding(charset).GetBytes(encypStr);
}
catch (Exception ex)
{
inputBye = Encoding.GetEncoding("GB2312").GetBytes(encypStr);
}
outputBye = m5.ComputeHash(inputBye);
retStr = System.BitConverter.ToString(outputBye);
retStr = retStr.Replace("-", "").ToUpper();
return retStr;
}
public void BindString()
{
//公众账号ID
string appid = appids;
//商品描述
string body = "订单号：" + order.Code;
//商户号
string mch_id = "***";
//随机字符串
string nonce_str = RdCode;
//通知地址-接收微信支付成功通知
string notify_url = "http://***/weixinnotify_url.aspx";
//用户标识 -用户在商户appid下的唯一标识
string openid = OpenId;
//商户订单号
string out_trade_no = order.Code;
//下单IP
string spbill_create_ip = GetIP(this.Context);
//总金额 分为单位
int total_fee = int.Parse(order.PayPrice.Value.ToString("0.00").Replace(".", ""));
//交易类型 -JSAPI、NATIVE、APP，如果是二维码扫描，请填写NATIVE，而且客户的OpenId可以不用传
string trade_type = "JSAPI";
//微信签名
string tmpStr = "appid=" + appid + "&body=" + body + "&mch_id=" + mch_id + "&nonce_str=" + nonce_str + "¬ify_url=" + notify_url + "&openid=" + openid + "&out_trade_no=" + out_trade_no + "&spbill_create_ip=" + spbill_create_ip + "&total_fee=" + total_fee + "&trade_type=" + trade_type + "&key=abc5465ouds65478dsaqw364879324ad";
string Getprepay_idSign = FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "MD5").ToUpper();
string url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
string string v = PostWebRequests(url, //获取的prepay_id
prepay_id = v;
paySign = "";
string v_tmpStr = "appId=" + appid + "&nonceStr=" + RdCode + "&package=prepay_id=" + v + "&signType=MD5&timeStamp=" + Timer + "&key=abc5465ouds65478dsaqw364879324ad";
paySign = FormsAuthentication.HashPasswordForStoringInConfigFile(v_tmpStr, "MD5").ToUpper();
}
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原标题：ASP.NET 微信支付
关键词：ASP.NET
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