1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5 using System.Web;
6 using System.Web.Mvc;
7 using System.IO;
8 using System.Security.Cryptography;
9 using System.Text;
10 using System.Xml;
11 using Newtonsoft.Json;
12 using Newtonsoft.Json.Linq;
13 namespace Mvc_vue.Controllers
14 {
15 public class wxController : Controller
16 {
17 //
18 // GET: /wx/
19
20 public ActionResult Index()
21 {
22 return View();
23 }
24 //所需值
25 public static string _appid = "wxd930ea5d5a258f4f";
26 public static string _mch_id = "10000100";
27 public static string _key = "192006250b4c09247ec02edce69f6a2d";
28
29 //模拟wx统一下单 openid(前台获取)
30 public string getda(string openid)
31 {
32 return Getprepay_id(_appid, "shanghaifendian", "monixiaofei", _mch_id, GetRandomString(30), "http://www.weixin.qq.com/wxpay/pay.php", openid, getRandomTime(), 1);
33
34 }
35
36
37
38 //微信统一下单获取prepay_id & 再次签名返回数据
39 private static string Getprepay_id(string appid, string attach, string body, string mch_id, string nonce_str, string notify_url, string openid, string bookingNo, int total_fee)
40 {
41 var url = "https://api.mch.weixin.qq.com/pay/unifiedorder";//微信统一下单请求地址
42 string strA = "appid=" + appid + "&attach=" + attach + "&body=" + body + "&mch_id=" + mch_id + "&nonce_str=" + nonce_str + "¬ify_url=" + notify_url + "&openid=" + openid + "&out_trade_no=" + bookingNo + "&spbill_create_ip=61.50.221.43&total_fee=" + total_fee + "&trade_type=JSAPI";
43 string strk = strA + "&key="+_key; //key为商户平台设置的密钥key(假)
44 string strMD5 = MD5(strk).ToUpper();//MD5签名
45
46 //string strHash=HmacSHA256("sha256",strmd5).ToUpper(); //签名方式只需一种(MD5 或 HmacSHA256 【支付文档需仔细看】)
47
48 //签名
49 var formData = "<xml>";
50 formData += "<appid>" + appid + "</appid>";//appid
51 formData += "<attach>" + attach + "</attach>"; //附加数据(描述)
52 formData += "<body>" + body + "</body>";//商品描述
53 formData += "<mch_id>" + mch_id + "</mch_id>";//商户号
54 formData += "<nonce_str>" + nonce_str + "</nonce_str>";//随机字符串，不长于32位。
55 formData += "<notify_url>" + notify_url + "</notify_url>";//通知地址
56 formData += "<openid>" + openid + "</openid>";//openid
57 formData += "<out_trade_no>" + bookingNo + "</out_trade_no>";//商户订单号 --待
58 formData += "<spbill_create_ip>61.50.221.43</spbill_create_ip>";//终端IP --用户ip
59 formData += "<total_fee>" + total_fee + "</total_fee>";//支付金额单位为（分）
60 formData += "<trade_type>JSAPI</trade_type>";//交易类型(JSAPI--公众号支付)
61 formData += "<sign>" + strMD5 + "</sign>"; //签名
62 formData += "</xml>";
63
64
65
66 //请求数据
67 var getdata = sendPost(url, formData);
68
69 //获取xml数据
70 XmlDocument doc = new XmlDocument();
71 doc.LoadXml(getdata);
72 //xml格式转json
73 string json = Newtonsoft.Json.JsonConvert.SerializeXmlNode(doc);
74
75
76
77 JObject jo = (JObject)JsonConvert.DeserializeObject(json);
78 string prepay_id = jo["xml"]["prepay_id"]["#cdata-section"].ToString();
79
80 //时间戳
81 string _time = getTime().ToString();
82
83 //再次签名返回数据至小程序
84 string strB = "appId=" + appid + "&nonceStr=" + nonce_str + "&package=prepay_id=" + prepay_id + "&signType=MD5&timeStamp=" + _time + "&key="_key;
85
86 //wx自己写的一个类
87 wx w = new wx();
88 w.timeStamp = _time;
89 w.nonceStr = nonce_str;
90 w.package = "prepay_id=" + prepay_id;
91 w.paySign = MD5(strB).ToUpper(); ;
92 w.signType = "MD5";
93
94 //向小程序返回json数据
95 return JsonConvert.SerializeObject(w);
96 }
97
98 /// <summary>
99 /// 生成随机串
100 /// </summary>
101 /// <param name="length">字符串长度</param>
102 /// <returns></returns>
103 private static string GetRandomString(int length)
104 {
105 const string key = "ABCDEFGHJKLMNPQRSTUVWXYZ23456789";
106 if (length < 1)
107 return string.Empty;
108
109 Random rnd = new Random();
110 byte[] buffer = new byte[8];
111
112 ulong bit = 31;
113 ulong result = 0;
114 int index = 0;
115 StringBuilder sb = new StringBuilder((length / 5 + 1) * 5);
116
117 while (sb.Length < length)
118 {
119 rnd.NextBytes(buffer);
120
121 buffer[5] = buffer[6] = buffer[7] = 0x00;
122 result = BitConverter.ToUInt64(buffer, 0);
123
124 while (result > 0 && sb.Length < length)
125 {
126 index = (int)(bit & result);
127 sb.Append(key[index]);
128 result = result >> 5;
129 }
130 }
131 return sb.ToString();
132 }
133
134 /// <summary>
135 /// 获取时间戳
136 /// </summary>
137 /// <returns></returns>
138 private static long getTime()
139 {
140 TimeSpan cha = (DateTime.Now - TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1)));
141 long t = (long)cha.TotalSeconds;
142 return t;
143 }
144
145
146 /// <summary>
147 /// MD5签名方法
148 /// </summary>
149 /// <param name="inputText">加密参数</param>
150 /// <returns></returns>
151 private static string MD5(string inputText)
152 {
153 MD5 md5 = new MD5CryptoServiceProvider();
154 byte[] fromData = System.Text.Encoding.UTF8.GetBytes(inputText);
155 byte[] targetData = md5.ComputeHash(fromData);
156 string byte2String = null;
157
158 for (int i = 0; i < targetData.Length; i++)
159 {
160 byte2String += targetData[i].ToString("x2");
161 }
162
163 return byte2String;
164 }
165 /// <summary>
166 /// HMAC-SHA256签名方式
167 /// </summary>
168 /// <param name="message"></param>
169 /// <param name="secret"></param>
170 /// <returns></returns>
171 private static string HmacSHA256(string message, string secret)
172 {
173 secret = secret ?? "";
174 var encoding = new System.Text.UTF8Encoding();
175 byte[] keyByte = encoding.GetBytes(secret);
176 byte[] messageBytes = encoding.GetBytes(message);
177 using (var hmacsha256 = new HMACSHA256(keyByte))
178 {
179 byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);
180 return Convert.ToBase64String(hashmessage);
181 }
182 }
183
184 /// <summary>
185 /// wx统一下单请求数据
186 /// </summary>
187 /// <param name="URL">请求地址</param>
188 /// <param name="urlArgs">参数</param>
189 /// <returns></returns>
190 private static string sendPost(string URL, string urlArgs)
191 {
192
193 System.Net.WebClient wCient = new System.Net.WebClient();
194 wCient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
195 //byte[] postData = System.Text.Encoding.ASCII.GetBytes(urlArgs); 如果微信签名中有中文会签名失败
196 byte[] postData = System.Text.Encoding.UTF8.GetBytes(urlArgs);
197 byte[] responseData = wCient.UploadData(URL, "POST", postData);
198
199 string returnStr = System.Text.Encoding.UTF8.GetString(responseData);//返回接受的数据
200 return returnStr;
201 }
202
203 /// <summary>
204 /// 生成订单号
205 /// </summary>
206 /// <returns></returns>
207 private static string getRandomTime()
208 {
209 Random rd = new Random();//用于生成随机数
210 string DateStr = DateTime.Now.ToString("yyyyMMddHHmmssMM");//日期
211 string str = DateStr + rd.Next(10000).ToString().PadLeft(4, '0');//带日期的随机数
212 return str;
213 }
214
215 }
216 }
使用的是MVC .NET Framework4
来源：oschina
链接：https://my.oschina.net/u/4316695/blog/4294461