(转)支付宝及时到帐接口

支付宝有一个类文件叫 AliPay 是一些加密算法的东西

using System.Web;
using System.Text;
using System.Security.Cryptography;
using System.IO;
using System.Net;
using System;
 
/// <summary>
/// New Interface for AliPay
/// </summary>
namespace Gateway
{
    public class AliPay
    {
        /// <summary>
        /// 与ASP兼容的MD5加密算法
        /// </summary>
        public static string GetMD5(string s, string _input_charset)
        {
            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] t = md5.ComputeHash(Encoding.GetEncoding(_input_charset).GetBytes(s));
            StringBuilder sb = new StringBuilder(32);
            for (int i = 0; i < t.Length; i++)
            {
                sb.Append(t.ToString("x").PadLeft(2, '0'));
            }
            return sb.ToString();
        }
 
        /// <summary>
        /// 冒泡排序法
        /// 按照字母序列从a到z的顺序排列
        /// </summary>
        public static string[] BubbleSort(string[] r)
        {
            int i, j; //交换标志
            string temp;
 
            bool exchange;
 
            for (i = 0; i < r.Length; i++) //最多做R.Length-1趟排序
            {
                exchange = false; //本趟排序开始前，交换标志应为假
 
                for (j = r.Length - 2; j >= i; j--)
                {//交换条件
                    if (System.String.CompareOrdinal(r[j + 1], r[j]) < 0)
                    {
                        temp = r[j + 1];
                        r[j + 1] = r[j];
                        r[j] = temp;
 
                        exchange = true; //发生了交换，故将交换标志置为真
                    }
                }
 
                if (!exchange) //本趟排序未发生交换，提前终止算法
                {
                    break;
                }
            }
            return r;
        }
 
        /// <summary>
        /// 生成URL链接或加密结果
        /// </summary>
        /// <param name="para">参数加密数组</param>
        /// <param name="_input_charset">编码格式</param>
        /// <param name="sign_type">加密类型</param>
        /// <param name="key">安全校验码</param>
        /// <returns>字符串URL或加密结果</returns>
        public static string CreatUrl(
            //string gateway,//GET方式传递参数时请去掉注释
            string[] para,
            string _input_charset,
            string sign_type,
            string key
            )
        {
            int i;
             
            //进行排序；
            string[] Sortedstr = BubbleSort(para);
 
 
            //构造待md5摘要字符串 ；
 
            StringBuilder prestr = new StringBuilder();
 
            for (i = 0; i < Sortedstr.Length; i++)
            {
                if (i == Sortedstr.Length - 1)
                {
                    prestr.Append(Sortedstr);
 
                }
                else
                {
                    prestr.Append(Sortedstr + "&");
                }
 
            }
 
            prestr.Append(key);
 
            //生成Md5摘要；
            string sign = GetMD5(prestr.ToString(), _input_charset);
 
            //以下是POST方式传递参数
            return sign;
 
        }
 
        //获取远程服务器ATN结果，验证是否是支付宝服务器发来的请求
        public static string Get_Http(string a_strUrl, int timeout)
        {
            string strResult;
            try
            {
                HttpWebRequest myReq = (HttpWebRequest)HttpWebRequest.Create(a_strUrl);
                myReq.Timeout = timeout;
                HttpWebResponse HttpWResp = (HttpWebResponse)myReq.GetResponse();
                Stream myStream = HttpWResp.GetResponseStream();
                StreamReader sr = new StreamReader(myStream, Encoding.Default);
                StringBuilder strBuilder = new StringBuilder();
                while (-1 != sr.Peek())
                {
                    strBuilder.Append(sr.ReadLine());
                }
 
                strResult = strBuilder.ToString();
            }
            catch (Exception exp)
            {
 
                strResult = "错误：" + exp.Message;
            }
 
            return strResult;
        }
 
    }
}

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