今天上午研究了一下微信支付的接口,发现网上转的大部分都是从微信支付接口文档上copy下来的,并没有任何实际的代码,因此写了一个微信的支付接口测试的小程序。
调用微信支付接口其实主要需要两个部分,一个是需要证书,二是组织参数
1.证书,在微信商户中将证书下载到测试机,注意的是,如果用.NET的话,一定要双击下载的证书并安装,否则后期调试接口的时候会报错,错误为:CA证书出错,请登录微信支付商户平台下载证书;
2.组织参数的时候主要的就是签名的生成,其实只要按照接口文档的步骤,一个个写下来,是没有任何问题的,容易出错的是当参数有中文的时候,容易出现错误,错误为:签名错误
下面是我写的主要的代码,以一段段的函数呈现:
1.组织参数,以字典的结构存储参数:
public string Create()
{
Dictionary<string, string> nativeObj = new Dictionary<string, string>();
nativeObj.Add("nonce_str", "3857F5B380EA425B91D4DD3D5F5A6594");
nativeObj.Add("mch_id", "商户号");
nativeObj.Add("mch_billno",“自己按照接口文档写的”);
nativeObj.Add("wxappid", "微信公众平台id");
nativeObj.Add("nick_name", "自定义");
nativeObj.Add("send_name", "自定义");
nativeObj.Add("re_openid", "用户的openid");
nativeObj.Add("total_amount", "100");
nativeObj.Add("min_value", "100");
nativeObj.Add("max_value", "100");
nativeObj.Add("total_num", "1");
nativeObj.Add("wishing", "感谢您参加猜灯谜活动,祝您元宵节快乐!");
nativeObj.Add("client_ip", "本机的ip地址");
nativeObj.Add("act_name", "猜灯谜抢红包活动 ");
nativeObj.Add("remark", "猜越多得越多,快来抢!"); //用来生成签名的方法,具体见下面
string sign = GetSign(nativeObj);
nativeObj.Add("sign", sign); //将参数组织成xml形式的字符串
return ToXml(nativeObj);
}2.生成签名:
public string GetSign(Dictionary<string, string> nativeObj)
{
string sign = "";
Dictionary<string, string> newobj = new Dictionary<string, string>();
string temp = ""; //参数的排序及去空
var dicSort = from objDic in nativeObj where objDic.Value != "" orderby objDic.Key select objDic;
foreach (var item in dicSort)
{
if (temp != "")
temp += "&";
temp += item.Key + "=" + item.Value;
}
temp += "&key=api密钥"; //MD5加密
sign = StringToMD5(temp,32).ToUpper();
return sign;
} public string StringToMD5(string str, int i)
{
//获取要加密的字段,并转化为Byte[]数组
byte[] data = System.Text.Encoding.Unicode.GetBytes(str.ToCharArray());
//建立加密服务
System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
//加密Byte[]数组
byte[] result = md5.ComputeHash(data);
//将加密后的数组转化为字段
if (i == 16 && str != string.Empty)
{
return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower().Substring(8, 16);
}
else if (i == 32 && str != string.Empty)
{
return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower();
}
else
{
switch (i)
{
case 16: return "000000000000000";
case 32: return "000000000000000000000000000000";
default: return "请确保调用函数时第二个参数为16或32";
}
}
}
3. 将参数组织成要提交的数据
public string ToXml(Dictionary<string, string> arr)
{
String xml = "<xml>";
foreach (KeyValuePair<string, string> pair in arr)
{
String key = pair.Key;
String val = pair.Value;
if (IsNumeric(val))
{
xml += "<" + key + ">" + val + "</" + key + ">";
}
else
xml += "<" + key + "><![CDATA[" + val + "]]></" + key + ">";
}
xml += "</xml>";
return xml;
}public bool IsNumeric(String str)
{
try
{
int.Parse(str);
return true;
}
catch
{
return false;
}
}
4.模拟post请求提交
public string Pay()
{
int dt = DateTime.Now.Millisecond;
string url = "https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack";
string cert = @"D:\cert\apiclient_cert.p12";//这里是你存储证书的位置
string password = "**********";//证书密码
//这一段借鉴的是微信官方提供的DEMO
ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
X509Certificate cer = new X509Certificate(cert, password);
HttpWebRequest webrequest = (HttpWebRequest)HttpWebRequest.Create(url);
webrequest.ClientCertificates.Add(cer);
webrequest.Method = "post";
webrequest.ContentType = "text/xml"; //这一段是自己写的添加post数据的方法
string postData = CreateNativePackage();
StreamWriter myWriter = null;
要注意的这是这个编码方式,还有内容的Xml内容的编码方式
//Encoding encoding = Encoding.GetEncoding("UTF-8");
try
{
myWriter = new StreamWriter(webrequest.GetRequestStream());
myWriter.Write(postData);
}
catch (Exception e)
{
}
finally
{
myWriter.Close();
}
HttpWebResponse webreponse = (HttpWebResponse)webrequest.GetResponse();
Stream stream = webreponse.GetResponseStream();
string resp = string.Empty;
using (StreamReader reader = new StreamReader(stream))
{
resp = reader.ReadToEnd();
}
string msg = resp; return msg;
}private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
{
if (errors == SslPolicyErrors.None)
return true;
return false;
}