支付宝Payto接口的c#.net实现

它现在这种支付方式比较多象网银在线等使用的方法都是url验证，就是通过url参数和一个这些url参数的md5编码来确认这个连接的正确性，支付宝在你购买成功后跳转自定义连接的时候会传2次过来，第一次是数据底层请求，第二次是web请求，而只有第一次有验证码，这个只能通过记录下来才看的到，因为两次请求间隔很小，如果光显示的话最后的结果是被第二次覆盖了的。所以在接收的时候就要设定接收条件，一种是没有notify_type参数的，一种是有的。

我们先来看一下创建一个连接地址

t1=ConfigurationSettings.AppSettings["interface"];//支付接口,就是给的一个连接地址

t2=ConfigurationSettings.AppSettings["account"];//支付宝帐户你的帐户

t3=ConfigurationSettings.AppSettings["password"];//安全校验码，设置的商家验证码

t4="images/logo_zfbsmall.gif";//按钮图片地址

t5="test";//悬停说明

cmd="0001";//默认

subject="item";//商品名称

body="decrip";//描述

order_no=;//定单号，用户自己生成，方便自己管理 prices=100;//价格0.01～50000.00

rurl="http://www.xxx.com/";//商品展示网址

types="1";//1：商品购买2：服务购买3：网络拍卖4：捐赠

number="1";//购买数量

transport="3";//1：平邮2：快递3：虚拟物品

ordinary_fee="";//平邮运费

express_fee="";//快递运费

read;//交易信息是否只读

buyer_msg="";//买家给卖家的留言

buyer="";//买家Email

buyer_name="";//买家姓名

buyer_address="";//买家地址

buyer_zipcode="";//买家邮编

buyer_tel="";//买家电话号码

buyer_mobile="";//买家手机号码

partner=ConfigurationSettings.AppSettings["partenid"];//合作伙伴ID,这个是固定的

上面就是要提供得基本信息，然后就是生成支付宝得连接，也就是给支付宝提供一条带验证的购买信息。

public string creatAlipayItemURL(string t1,string t2,string t3,string t4,string t5,string cmd,string subject,string body,string order_no,string prices,string rurl,string types,string number,string transport,string ordinary_fee,string express_fee,string readonlys,string buyer_msg,string buyer,string buyer_name,string buyer_address,string buyer_zipcode,string buyer_tel,string buyer_mobile,string partner)

{

string itemURL,str2CreateAc,acCode;

string INTERFACE_URL,sellerEmail,keyCode,imgsrc,imgtitle,AlipayItemURL;

//初始化各必要变量

INTERFACE_URL=t1+t2;//支付接口

sellerEmail=t2;//商户支付宝账户（改成你自己的）

keyCode=t3;//安全校验码（改成你自己的）

imgsrc=t4;//支付宝按钮图片

imgtitle=t5;//按钮悬停说明

str2CreateAc="cmd" + cmd + "subject" + subject;

str2CreateAc=str2CreateAc + "body" + body;

str2CreateAc=str2CreateAc + "order_no" + order_no;

str2CreateAc=str2CreateAc + "price" + prices;

//str2CreateAc=str2CreateAc + "url" + rurl;

str2CreateAc=str2CreateAc + "type" + types;

str2CreateAc=str2CreateAc + "number" + number;

str2CreateAc=str2CreateAc + "transport" + transport;

/*str2CreateAc=str2CreateAc + "ordinary_fee" + ordinary_fee;

str2CreateAc=str2CreateAc + "express_fee" + express_fee;

str2CreateAc=str2CreateAc + "readonly" + readonlys;

str2CreateAc=str2CreateAc + "buyer_msg" + buyer_msg;*/

str2CreateAc=str2CreateAc + "seller" + sellerEmail;

/*str2CreateAc=str2CreateAc + "buyer" + buyer;

str2CreateAc=str2CreateAc + "buyer_name" + buyer_name;

str2CreateAc=str2CreateAc + "buyer_address" + buyer_address;

str2CreateAc=str2CreateAc + "buyer_zipcode" + buyer_zipcode;

str2CreateAc=str2CreateAc + "buyer_tel" + buyer_tel;

str2CreateAc=str2CreateAc + "buyer_mobile" + buyer_mobile;*/

str2CreateAc=str2CreateAc + "partner" + partner;

str2CreateAc=str2CreateAc + keyCode;

//acCode=FormsAuthentication.HashPasswordForStoringInConfigFile(str2CreateAc,"MD5");

acCode=this.GetMD5(str2CreateAc,"gb2312");

itemURL=INTERFACE_URL + "?cmd=" + cmd;

itemURL=itemURL + "&subject=" + HttpUtility.UrlEncode(subject);

itemURL=itemURL + "&body=" + HttpUtility.UrlEncode(body);

itemURL=itemURL + "&order_no=" + order_no;

itemURL=itemURL + "&price=" + prices;

//itemURL=itemURL + "&url=" + rurl;

itemURL=itemURL + "&type=" + types;

itemURL=itemURL + "&number=" + number;

itemURL=itemURL + "&transport=" + transport;

/*itemURL=itemURL + "&ordinary_fee=" + ordinary_fee;

itemURL=itemURL + "&express_fee=" + express_fee;

itemURL=itemURL + "&readonly=" + readonlys;

itemURL=itemURL + "&buyer_msg=" + HttpUtility.UrlEncode(buyer_msg);

itemURL=itemURL + "&buyer=" + HttpUtility.UrlEncode(buyer);

itemURL=itemURL + "&buyer_name=" + HttpUtility.UrlEncode(buyer_name);

itemURL=itemURL + "&buyer_address=" + HttpUtility.UrlEncode(buyer_address);

itemURL=itemURL + "&buyer_zipcode=" + buyer_zipcode;

itemURL=itemURL + "&buyer_tel=" + buyer_tel;

itemURL=itemURL + "&buyer_mobile=" + buyer_mobile;*/

itemURL=itemURL + "&partner=" + partner;

itemURL=itemURL + "&ac=" + acCode;

AlipayItemURL=itemURL;

return AlipayItemURL;

}

这个函数就是返回生成的地址，里面注释掉的看你自己需要可以添加进去，然后就是md5码的问题，现在用默认的md5生成程序对中文的支持只限于GB2312，而支付宝使用的是GBK，虽然两个编码的内容GBK兼容GB2312但是毕竟两个编码方式不同，所以会产生错误，如果用英文或者数字不会有问题。上面下载里面带的一个md5.asp的算法支持中文。

现在已经可以跳转到支付宝的页面了，而我们这边就要自己记录用户的信息已经生成的定单编号，这样在支付宝返回信息的时候来查询。在设定了返回地址后，我们就要看接收页面了。

string msg_id,order_no,gross,buyer_email,buyer_name,buyer_address,buyer_zipcode,buyer_tel,buyer_mobile,action,s_date,ac,notify_type;

string returnTxt;//返回给支付宝通知接口的结果

string alipayNotifyURL;//支付宝查询接口URL

string myalipayEmail;//商户的支付宝Email

string Resp;

returnTxt = "N";

alipayNotifyURL = ConfigurationSettings.AppSettings["interfaceback"];//支付宝查询接口地址

myalipayEmail = ConfigurationSettings.AppSettings["account"];//填写您的支付宝帐号

//检查支付宝通知接口传递过来的参数是否合法

msg_id = newop.DelStr(Request["msg_id"]);

order_no = newop.DelStr(Request["order_no"]);

gross = newop.DelStr(Request["gross"]);

buyer_email = newop.DelStr(Request["buyer_email"]);

buyer_name = newop.DelStr(Request["buyer_name"]);

buyer_address = newop.DelStr(Request["buyer_address"]);

buyer_zipcode = newop.DelStr(Request["buyer_zipcode"]);

buyer_tel = newop.DelStr(Request["buyer_tel"]);

buyer_mobile = newop.DelStr(Request["buyer_mobile"]);

action = newop.DelStr(Request["action"]);

s_date = newop.DelStr(Request["date"]);

ac = newop.DelStr(Request["ac"]);

notify_type = newop.DelStr(Request["notify_type"]);

alipayNotifyURL = alipayNotifyURL + "msg_id=" + msg_id + "&email=" + myalipayEmail + "&order_no=" + order_no;

System.Net.WebClient isClient= new System.Net.WebClient();

Stream isStream = isClient.OpenRead(alipayNotifyURL);

StreamReader isReader = new StreamReader(isStream,System.Text.Encoding.GetEncoding("GB2312"));

ResponseTxt = isReader.ReadToEnd();

if(action == "test")//测试商户网站URL是否正确安装

{

returnTxt = "Y";

}

else if((action=="sendOff")&&(msg_id!=""))//发货通知

{

returnTxt = "N";

if((ResponseTxt == "true")||(ResponseTxt == "false"))

{

//更新数据在商户系统里的订单数据；如果已经发货，则将returnTxt置为Y，否则为N

}

else

{

//非法数据，不做更新

returnTxt="Error";

}

}

else if((action=="sendOff")&&(notify_type=="web"))

{

//检查是否已经付帐，并记录 }

else if((action=="checkOut")&&(msg_id!=""))//交易结束通知

{

returnTxt = "Y";

if((ResponseTxt=="true")||(ResponseTxt == "false"))

{

//更新数据在商户系统里的订单数据；如果数据更新成功，则将returnTxt置为Y，否则为N

//更新数据

//你的代码，更新你这边数据

returnTxt= "Y";

}

else

{

//非法数据，不做更新

returnTxt = "Error";

}

}

else

{

returnTxt="Error";

}

Response.Write(returnTxt);