ASP.NET 微信支付

一、在支付前期，我們需要獲取用戶的OpenId，此塊內容只針對於JSAPI（微信中直接支付）才需要，如果生成二維碼（NATIVE）掃描支付，請跳過此步驟

 

思路大致是：獲取用戶的code值 > 根據code值再獲取用戶的OpenId

 

1、先綁定授權域名：開發者中心>網頁服務>基礎接口>網頁授權獲取用戶基本信息>修改>設置網站的域名 。點擊查看

2、獲取用戶的code值時，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不用多說，redirect_uri為網站的回調地址，回調地址必須UrlEncode處理，其中返回的參數就有code值

關於網頁授權的兩種scope的區別說明：snsapi_base和snsapi_userinfo，scope只有這2種方式

snsapi_base是不需要用戶同意的，但是回調地址中獲取到的code，根據這個code只能獲取用戶的OpenId，像：昵稱，性別等是無法獲取的，但是對於微信支付足夠了

snsapi_userinfo是需要用戶同意才能獲取code,通過code能夠獲取用戶的基本信息，這個做微信登錄比較好，但是如果客戶不同意就沒辦法進行下邊的環節了，所以微信支付不要用這個參數。

3、根據2中返回的code值，獲取用戶的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值是從2中獲取到的，返回參數為json，其中有一個參數為openid。

//1.獲取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.獲取OpenId string urls = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=&secret=&code=" + Code + "&grant_type=authorization_code"; string openid = PostWebRequest(urls, ""); /// <summary> /// 獲取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; //定義Stream信息 Stream stream = webReq.GetRequestStream(); stream.Write(byteData, 0, byteData.Length); stream.Close(); //獲取返回信息 HttpWebResponse response = (HttpWebResponse)webReq.GetResponse(); StreamReader streamReader = new StreamReader(response.GetResponseStream(), Encoding.Default); returnValue = streamReader.ReadToEnd(); //關閉信息  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>開發配置>支付授權目錄  設置一個支付頁面所在文件夾   點擊查看相應位置

登錄商戶平台 > API安全 > 設置一個32位由數字和字母組成的密鑰。  以上內容設置好后才可以進行支付參數的設置

1、引用微信JS  http://res.wx.qq.com/open/js/jweixin-1.0.0.js

2、設置config參數

3、設置chooseWXPay參數

4、支付

 

這里需要強調的是，下邊config和chooseWXPay中的參數名為：nonceStr、timestamp要一直，否則就會一直報錯：paySign加密錯誤

其中package的prepay_id參數內容的獲取內容為可以根據官網的要求來，但傳參字段一定要小寫，一定要小寫！

paySign 的加密方式為chooseWXPay的參數內容：timestamp、nonceStr、package、signType、key的組合加密，加密方式 和獲取prepay_id的方式一樣，具體操作看代碼。但是這里的加密的參數的大小寫要前后台對應一直，否則加密一定錯誤！

加密的方式如：把所有的參數首字母從小到大傳參的形式組成字符串后，把key值再拼接上，具體內容請參考微信的簽名算法和微信下單的參數列表

 

<script src="../js/jquery.js" type="text/javascript"></script> <script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js" type="text/javascript"></script> <script type="text/javascript"> wx.config({ debug: false, // 開啟調試模式,調用的所有api的返回值會在客戶端alert出來，若要查看傳入的參數，可以在pc端打開，參數信息會通過log打出，僅在pc端時才會打印。 appId: '<%=appids %>', // 必填，公眾號的唯一標識 timestamp: "<%=Timer %>", // 必填，生成簽名的時間戳 nonceStr: "<%=RdCode %>", // 必填，生成簽名的隨機串 signature: "<%=GetSignature() %>", // 必填，簽名，見附錄1 jsApiList: ['chooseWXPay'] // 必填，需要使用的JS接口列表，所有JS接口列表見附錄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 = "";//這里是公眾號的AppId public string Code = ""; //訂單號 public string Timer = "";//1970年到現在的秒數 public string OpenId = "";//用戶的OpenId public string paySign = "";//paySign public string RdCode = "";//隨機數 public string prepay_id = "";//package中prepay_id的值
public string AppSecret = "";//公眾號的AppSecret protected 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>
/// 獲取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>
/// 獲取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簽名
/// </summary>
/// <returns></returns>
public string GetSignature()
{
    string tmpStr = "jsapi_ticket=" + Tiks + "&noncestr=" + RdCode + "&timestamp=" + Timer + "&url=" + Request.Url.ToString();
    return FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "SHA1");

}

/// <summary>
/// 客戶端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>
/// 獲取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;
        //定義Stream信息
        Stream stream = webReq.GetRequestStream();
        stream.Write(byteData, 0, byteData.Length);
        stream.Close();
        //獲取返回信息
        HttpWebResponse response = (HttpWebResponse)webReq.GetResponse();
        StreamReader streamReader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
        returnValue = streamReader.ReadToEnd();
        //關閉信息
        streamReader.Close();
        response.Close();
        stream.Close();

        XmlDocument doc = new XmlDocument();
        doc.LoadXml(returnValue);
        XmlNodeList list = doc.GetElementsByTagName("xml");
        XmlNode xn = list[0];
        string prepay_ids = xn.SelectSingleNode("//prepay_id").InnerText;
        return prepay_ids;
            //如果是二維碼掃描，請返回下邊的code_url，然后自己再更具內容生成二維碼即可
            //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();

    //創建md5對象
    byte[] inputBye;
    byte[] outputBye;

    //使用GB2312編碼方式把字符串轉化為字節數組．
    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()
{
    //公眾賬號ID
    string appid = appids;
    //商品描述
    string body = "訂單號：" + order.Code;
    //商戶號
    string mch_id = "***";
    //隨機字符串
    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";
    //用戶標識 -用戶在商戶appid下的唯一標識
    string openid = OpenId;
    //商戶訂單號
    string out_trade_no = order.Code;
    //下單IP
    string spbill_create_ip = GetIP(this.Context);
    //總金額 分為單位
    int total_fee = int.Parse(order.PayPrice.Value.ToString("0.00").Replace(".", ""));
    //交易類型 -JSAPI、NATIVE、APP，如果是二維碼掃描，請填寫NATIVE，而且客戶的OpenId可以不用傳
    string trade_type = "JSAPI";

    //微信簽名
    string tmpStr = "appid=" + appid + "&body=" + body + "&mch_id=" + mch_id + "&nonce_str=" + nonce_str + "&notify_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 xml = "<xml>";
    xml += "<appid>" + appid + "</appid>";
    xml += "<body>" + body + "</body>";
    xml += "<mch_id>" + mch_id + "</mch_id>";
    xml += "<nonce_str>" + nonce_str + "</nonce_str>";
    xml += "<notify_url>" + notify_url + "</notify_url>";
    xml += "<openid>" + openid + "</openid>";
    xml += "<out_trade_no>" + out_trade_no + "</out_trade_no>";
    xml += "<spbill_create_ip>" + spbill_create_ip + "</spbill_create_ip>";
    xml += "<total_fee>" + total_fee + "</total_fee>";
    xml += "<trade_type>" + trade_type + "</trade_type>";
    xml += "<sign>" + Getprepay_idSign + "</sign>";
    xml += "</xml>";
    string v = PostWebRequests(url, xml);
    //獲取的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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