C# 实现快递鸟API接口 数据签名通用方法

//电商ID
string eEBusinessID = "test1617571";
 //电商加密私钥，快递鸟提供，注意保管，不要泄漏
string appKey= "554343b2-7252-439b-b4eb-1af42c8f2175";
 //请求url
string reqURL = "http://sandboxapi.kdniao.com:8080/kdniaosandbox/gateway/exterfaceInvoke.json";
//请求指令 
string reqType="1002";
//2-json 
string dataType = "2"; 
//字符编码采用UTF-8 
string charset = "UTF-8"; 
//JSON字符串string 
string jsonStr = 
"{\"OrderCode\":\"\",\"ShipperCode\":\"SF\",\"LogisticCode\":\"118461988807\"}" ;
//把(jsonStr+APIKey)进行MD5加密
string md5Str=MD5(jsonStr + apiKey, charset);
//把md5Str 进行Base64编码
string base64Str=base64(md5Str,charset);
//进行URL编码 (utf-8)
string datasign = HttpUtility.UrlEncode(base64Str, charset); 
//请求报文参数 
string postStr = "RequestType=reqType&EBusinessID= eEBusinessID&RequestData=jsonStr 
&DataSign= datasign&DataType=dataType"; 
//通讯协议使用Http协议Post请求方式 返回轨迹数据
string post = SendPost(reqURL, postStr);
//获取到的post数据就是快递鸟返回的完整报文，接下来自己写一个解析json的方法就能获取到里面的字段信息。

///<summary>
    /// 字符串MD5加密
    ///</summary>
    ///<param name="str">要加密的字符串</param>
    ///<param name="charset">编码方式</param>
    ///<returns>密文</returns>
    private string MD5(string str, string charset)
    {
        byte[] buffer = System.Text.Encoding.GetEncoding(charset).GetBytes(str);
        try
        {
            System.Security.Cryptography.MD5CryptoServiceProvider check;
            check = new System.Security.Cryptography.MD5CryptoServiceProvider();
            byte[] somme = check.ComputeHash(buffer);
            string ret = "";
            foreach (byte a in somme)
            {
                if (a < 16)
                    ret += "0" + a.ToString("X");
                else
                    ret += a.ToString("X");
            }
            return ret.ToLower();
        }
        catch
        {
            throw;
        }
    }
    /// <summary>
    /// base64编码
    /// </summary>
    /// <param name="str">内容</param>
    /// <param name="charset">编码方式</param>
    /// <returns></returns>
    private string base64(String str, String charset)
    {
        return Convert.ToBase64String(System.Text.Encoding.GetEncoding(charset).GetBytes(str));
}
 /// <summary>
    /// Post方式提交数据，返回网页的源代码
    /// </summary>
    /// <param name="url">发送请求的 URL</param>
    /// <param name="postData">请求报文参数</param>
    /// <returns>远程资源的响应结果</returns>
    private string SendPost(string url, string postData)
    {
        string result = "";
        byte[] byteData = Encoding.GetEncoding("UTF-8").GetBytes(postData.ToString());
        try
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.ContentType = "application/x-www-form-urlencoded";
            request.Referer = url;
            request.Accept = "*/*";
            request.Timeout = 30 * 1000;
            request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)";
            request.Method = "POST";
            request.ContentLength = byteData.Length;
            Stream stream = request.GetRequestStream();
            stream.Write(byteData, 0, byteData.Length);
            stream.Flush();
            stream.Close();
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream backStream = response.GetResponseStream();
            StreamReader sr = new StreamReader(backStream, Encoding.GetEncoding("UTF-8"));
            result = sr.ReadToEnd();
            sr.Close();
            backStream.Close();
            response.Close();
            request.Abort();
        }
        catch (Exception ex)
        {
            result = ex.ToString();
        }
        return result;
    }