接口对接常见的问题基本上是数据签名错误导致的接口联调失败，而API接口是获取网络服务最便捷的方式，合理地使用API接口开发项目可以大大提高开发效率，把精力都集中在程序的业务逻辑之上，避免重复造轮子。
本期给大家讲解：如何用C# 实现免费快递查询API接口对接。非常简单，略懂技术的菜鸟也能直接对接。首先要注册一个快递鸟的账号：点击注册
方法调用的代码实现
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。
C#封装的方法
/// 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;
}
下期大家想看什么内容，可以在下方留言或私信我，大家一起探讨。
