一、系統A(官網)與系統B(第三方支付平台)數據交換的方式
1.1 頁面瀏覽器方式:系統A以構造Form表單的方式,通過系統A客戶的瀏覽器重定向到系統B(向系統B發送請求),B系統完成交易后,將交易結果送給A系統。eg:A系統用戶完成注冊后在B系統開戶
1.2 后台數據流方式:后台數據流方式分為表單和Json格式返回兩種數據格式,開戶和交易接口都是使用表單,查詢類接口使用JSON;A系統服務器,構造Http協議報文,直接訪問B系統,將Http報文發送到B系統,並獲取返回的滿足Http報文協議的字符流。在數據流的方式下,A系統以表單的方式將數據發送到B系統,B系統收到后進行相應的處理。
現已第三方提供的Pos機自動代扣的接口為例,分別講解前台和回台數據交換:
二、頁面瀏覽器方式
2.1 以Form表單的形式提交
A、 transfer.aspx頁面,body內容如下,其中注意body標簽的onload事件,form的Action在后台指定;transfer只是中轉頁面,以供在系統中其他頁面只需拋數據到transfer頁面,而不關注與第三方的交互,與第三方交互主要由transfer頁面完成
<body onload="sub();">
<form id="formMain" runat="server">
<input type="hidden" name="Version" value="<%=Version%>" />
<input type="hidden" name="CmdId" value="<%=CmdId%>" />
<input type="hidden" name="MerCustId" value="<%=MerCustId%>" />
<input type="hidden" name="UsrCustId" value="<%=UsrCustId%>" />
<input type="hidden" name="OpenAcctId" value="<%=OpenAcctId%>" />
<input type="hidden" name="TransAmt" value="<%=TransAmt%>" />
<input type="hidden" name="OrdId" value="<%=OrdId%>" />
<input type="hidden" name="OrdDate" value="<%=OrdDate%>" />
<input type="hidden" name="CheckDate" value="<%=CheckDate%>" />
<input type="hidden" name="RetUrl" value="<%=RetUrl%>" />
<input type="hidden" name="BgRetUrl" value="<%=BgRetUrl%>" />
<input type="hidden" name="MerPriv" value="<%=MerPriv%>" />
<input type="hidden" name="ChkValue" value="<%=ChkValue%>" />
</form>
<script type="text/javascript">
function sub() {
document.getElementById("formMain").submit();
}
</script>
</body>
B、 transfer.aspx.cs內容如下:
public partial class Interface_POSWithoutCard_Transfer
{
public readonly string PnrUrl = ChinaPnrInterfaces.GetConfigValue("pnrurl");
public readonly string Version = ChinaPnrInterfaces.GetConfigValue("pnrversion");
public readonly string CmdId = "PosWhSave"; //函數名稱
public string MerCustId = string.Empty; //商戶ID
public string UsrCustId = string.Empty; //用戶ID(PNRID)
public string OpenAcctId = string.Empty; //開戶銀行賬號
public string TransAmt = string.Empty; //交易金額
public string OrdId = string.Empty; //訂單號
public string OrdDate = string.Empty; //訂單日期
public string CheckDate = string.Empty; //校驗日期
public string RetUrl = string.Empty; //頁面返回
public string BgRetUrl = string.Empty; //商戶后台應答地址
public string MerPriv = string.Empty; //商戶私有域
public string ChkValue = string.Empty;protected void Page_Load(object sender, EventArgs e)
{
MerCustId = CurMerCustId;
UsrCustId = DESEncrypt.Decrypt(Request["UsrCustId"]);
OpenAcctId = DESEncrypt.Decrypt(Request["OpenAcctId"]);
TransAmt = DESEncrypt.Decrypt(Request["TransAmt"]);
CheckDate = DESEncrypt.Decrypt(Request["CheckDate"]);OrdId = bll.GetNextOrdId();
OrdDate = DateTime.Now.ToString("yyyyMMdd");//CurWebUrl
RetUrl = string.Format("{0}/Interface/POSWithoutCard_Return.aspx?action=frontend&ordid={1}&transamt={2}", CurWebUrl, DESEncrypt.Encrypt(OrdId), DESEncrypt.Encrypt(TransAmt));//第三方支付平台根據此字段獲取前后回應地址,注意,由第三方處理完后回傳的這部分數據其他內容需要通過Request.Form["Name"]獲取,但對於地址后面的action,ordid和transamt需要使用get方式獲取; 公路養護車,雙排座自卸車,散裝飼料運輸車廠家價格(http://www.glyhche.com/)
BgRetUrl = string.Format("{0}/Interface/POSWithoutCard_Return.aspx?action=backend&ordid={1}&transamt={2}", CurWebUrl, DESEncrypt.Encrypt(OrdId), DESEncrypt.Encrypt(TransAmt));//后台預防返回地址
formMain.Action = PnrUrl;//地址為第三方提供的接收頁面if (bll.CreateLog(new dw_poswksave_log_model()
{
OrdId = OrdId,
PnrId = UsrCustId,
BankId = OpenAcctId,
TransAmt = float.Parse(TransAmt),
OrdDate = OrdDate,
CheckDate = CheckDate
}))
{
ChkValue = ChinaPnrInterfaces.SignChkValue(Version + CmdId + MerCustId + UsrCustId
+ OpenAcctId + TransAmt + OrdId + OrdDate + CheckDate + RetUrl + BgRetUrl + MerPriv);
}Response.ContentEncoding = Encoding.GetEncoding("gb2312");
}protected string DateToString(string strDate)
{
DateTime date;
if (!DateTime.TryParse(strDate, out date))
date = DateTime.Now;return date.ToString("yyyyMMdd");
}protected string MoneyToString(string strMoney)
{
if (string.IsNullOrEmpty(strMoney))
strMoney = "0";return float.Parse(strMoney).ToString("F2");
}
}C、Return.aspx 頁面用於接收第三方支付平台回傳的結果
<body>
<% if (ShowUserTip) { %>
<div class="err">
<div class="info">
<div>
響應信息
</div>
<div>
<div>代碼:<%=RespHFCode%></div>
<div>描述:<%=RespHFDesc%></div>
</div>
<div><%=RespHFCode.Equals(HFOK) ? "" : "請重新提交!"%></div>
</div>
<div class="bot">
<input type="button" value="關閉此窗口" onclick="window.close();" />
</div>
</div>
<% } %>
</body>
D、Return.aspx.cs文件如下:
public readonly string HFOK = "000";
public string RespHFString = string.Empty;
public string RespHFCode = string.Empty;
public string RespHFDesc = string.Empty;
public string OrdId = string.Empty;
public string TransAmt = string.Empty;
public bool ShowUserTip = false;protected void Page_Load(object sender, EventArgs e)
{
string action = Request["action"];//對應transfer傳遞參數時放在地址后的參數
if (!string.IsNullOrEmpty(action))
{
RespHFString = "RECV_ORD_ID_" + Request.Form["TrxId"];//在頁面顯示
RespHFCode = Request.Form["RespCode"];
RespHFDesc = Request.Form["RespDesc"];
OrdId = DESEncrypt.Decrypt(Request["ordid"]);
TransAmt = DESEncrypt.Decrypt(Request["transamt"]);switch (action)
{
case "frontend":
ShowUserTip = true;//前台回復,將結果顯示在頁面上
UpdatePosLog();
break;
case "backend"://后台響應直接存儲就可以了,但需要判斷前台是否已經處理,否則會造成數據重復處理
string checkValue = Request.Form["CmdId"].Trim()
+ Request.Form["RespCode"].Trim()
+ Request.Form["MerCustId"].Trim()
+ Request.Form["UsrCustId"].Trim()
+ Request.Form["OpenAcctId"].Trim()
+ Request.Form["TransAmt"].Trim()
+ Request.Form["OrdId"].Trim()
+ Request.Form["OrdDate"].Trim()
+ Request.Form["CheckDate"].Trim()
+ Request.Form["TrxId"].Trim()
+ Request.Form["RetUrl"].Trim()
+ Request.Form["BgRetUrl"].Trim()
+ Request.Form["MerPriv"].Trim();if (ChinaPnrInterfaces.DecChkValue(checkValue, Request.Form["ChkValue"]).Equals("0"))
{
UpdatePosLog();
}
break;
}
}
}
三、后台數據流方式
3.1、使用HttpWebRequest對象,Post數據:
string TransferUrl = string.Empty;
string postData = string.Empty;
string userPnrID = dr["pnrid"].ToString();
string bankID = dr["BankId"].ToString();
string checkDate = dr["CheckDate"].ToString();
string repayment_account = Decimal.Round(Convert.ToDecimal(TransNullOrEmpty(dr["repayment_account"].ToString())), 2).ToString();
TransferUrl = string.Format("{0}/Interface/POSWithoutCard_Transfer.aspx", strWebSiteUrl);//需要請求的頁面
postData = string.Format("UsrCustId={0}&OpenAcctId={1}&TransAmt={2}&CheckDate={3}",
DESEncrypt.Encrypt(userPnrID), DESEncrypt.Encrypt(bankID), DESEncrypt.Encrypt(repayment_account), DESEncrypt.Encrypt(checkDate));//傳遞的參數
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(TransferUrl);//后台請求頁面
string s = postData;
Encoding encoding = Encoding.GetEncoding("GB2312");//GB2312,注意頁面的編碼,否則會出現亂碼
byte[] requestBytes = encoding.GetBytes(postData);
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = requestBytes.Length;
Stream requestStream = req.GetRequestStream();
requestStream.Write(requestBytes, 0, requestBytes.Length);
requestStream.Close();
HttpWebResponse res = (HttpWebResponse)req.GetResponse();
StreamReader sr = new StreamReader(res.GetResponseStream(), System.Text.Encoding.GetEncoding("GB2312"));
string backstr = sr.ReadToEnd();//可以讀取到從頁面返回的結果,以數據流的形式。
// Response.Write(backstr);
sr.Close();
res.Close();
3.2、使用WebClient對象:
string postData = string.Format("UsrCustId={0}&OpenAcctId={1}&TransAmt={2}&CheckDate={3}",
DESEncrypt.Encrypt(userPnrID), DESEncrypt.Encrypt(bankID), DESEncrypt.Encrypt(repayment_account), DESEncrypt.Encrypt(checkDate));//這里即為傳遞的參數,可以用工具抓包分析,也可以自己分析,主要是form里面每一個name都要加進來byte[] postData = Encoding.UTF8.GetBytes(postString);//編碼,尤其是漢字,事先要看下抓取網頁的編碼方式
string TransferUrl= string.Format("{0}/Interface/POSWithoutCard_Transfer.aspx", strWebSiteUrl);//需要請求的頁面
WebClient webClient = new WebClient();
webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");//采取POST方式必須加的header,如果改為GET方式的話就去掉這句話即可
byte[] responseData = webClient.UploadData(TransferUrlurl, "POST", postData);//得到返回字符流
string srcString = Encoding.UTF8.GetString(responseData);//解碼
3.3、WebBrowser對象(沒用過,暫時不討論,具體可參考http://www.cnblogs.com/peterzb/archive/2009/07/12/1521787.html)
轉自:http://blog.itpub.net/28699126/viewspace-1127499/