时间不多，废话少说：
网络请求代码如下：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.DirectoryServices.Protocols;
using System.ServiceModel.Security;
using System.Net;
using System.IO;
using System.IO.Compression;
using System.Text.RegularExpressions;
using System.Threading; namespace Meeting.Common
{
/// <summary>
/// 有关HTTP请求的辅助类
/// </summary>
public class HttpWebResponseUtility
{ public static string GetUrl(string url)
{ if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
{
System.Console.WriteLine("https connections.....");
ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
// 这里设置了协议类型。
//ServicePointManager.SecurityProtocol =SecurityProtocolType.Tls12;// (SecurityProtocolType)3072;// SecurityProtocolType.Tls1.2;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12; //(SecurityProtocolType)768 | (SecurityProtocolType)3072 ServicePointManager.CheckCertificateRevocationList = true;
ServicePointManager.DefaultConnectionLimit = ;
ServicePointManager.Expect100Continue = false;
}
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
//增加下面两个属性即可
request.KeepAlive = false;
request.ProtocolVersion = HttpVersion.Version10; request.Method = "GET"; //使用get方式发送数据
request.ContentType = "application/x-www-form-urlencoded";
request.Referer = "";
request.AllowAutoRedirect = true;
request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
request.Accept = "*/*"; //获取网页响应结果
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
// Thread.Sleep(2000);
Stream stream = response.GetResponseStream();
//client.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
string result = string.Empty;
using (StreamReader sr = new StreamReader(stream))
{
result = sr.ReadToEnd();
} if (request != null)
{
request.Abort();
} if (response != null)
{
response.Close();
} return result;
}
private static readonly string DefaultUserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
/// <summary>
/// 创建GET方式的HTTP请求
/// </summary>
/// <param name="url">请求的URL</param>
/// <param name="timeout">请求的超时时间</param>
/// <param name="userAgent">请求的客户端浏览器信息，可以为空</param>
/// <param name="cookies">随同HTTP请求发送的Cookie信息，如果不需要身份验证可以为空</param>
/// <returns></returns>
public static HttpWebResponse CreateGetHttpResponse(string url, int? timeout, string userAgent, CookieCollection cookies)
{
if (string.IsNullOrEmpty(url))
{
throw new ArgumentNullException("url");
}
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
request.Method = "GET";
request.UserAgent = DefaultUserAgent;
if (!string.IsNullOrEmpty(userAgent))
{
request.UserAgent = userAgent;
}
if (timeout.HasValue)
{
request.Timeout = timeout.Value;
}
if (cookies != null)
{
request.CookieContainer = new CookieContainer();
request.CookieContainer.Add(cookies);
}
return request.GetResponse() as HttpWebResponse;
}
/// <summary>
/// 创建POST方式的HTTP请求
/// </summary>
/// <param name="url">请求的URL</param>
/// <param name="parameters">随同请求POST的参数名称及参数值字典</param>
/// <param name="timeout">请求的超时时间</param>
/// <param name="userAgent">请求的客户端浏览器信息，可以为空</param>
/// <param name="requestEncoding">发送HTTP请求时所用的编码</param>
/// <param name="cookies">随同HTTP请求发送的Cookie信息，如果不需要身份验证可以为空</param>
/// <returns></returns>
public static HttpWebResponse CreatePostHttpResponse(string url, IDictionary<string, string> parameters, int? timeout, string userAgent, Encoding requestEncoding, CookieCollection cookies)
{
if (string.IsNullOrEmpty(url))
{
throw new ArgumentNullException("url");
}
if (requestEncoding == null)
{
throw new ArgumentNullException("requestEncoding");
}
HttpWebRequest request = null;
//如果是发送HTTPS请求
if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
{
ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
request = WebRequest.Create(url) as HttpWebRequest;
request.ProtocolVersion = HttpVersion.Version10;
}
else
{
request = WebRequest.Create(url) as HttpWebRequest;
}
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded"; if (!string.IsNullOrEmpty(userAgent))
{
request.UserAgent = userAgent;
}
else
{
request.UserAgent = DefaultUserAgent;
} if (timeout.HasValue)
{
request.Timeout = timeout.Value;
}
if (cookies != null)
{
request.CookieContainer = new CookieContainer();
request.CookieContainer.Add(cookies);
}
//如果需要POST数据
if (!(parameters == null || parameters.Count == ))
{
StringBuilder buffer = new StringBuilder();
int i = ;
foreach (string key in parameters.Keys)
{
if (i > )
{
buffer.AppendFormat("&{0}={1}", key, parameters[key]);
}
else
{
buffer.AppendFormat("{0}={1}", key, parameters[key]);
}
i++;
}
byte[] data = requestEncoding.GetBytes(buffer.ToString());
using (Stream stream = request.GetRequestStream())
{
stream.Write(data, , data.Length);
}
}
return request.GetResponse() as HttpWebResponse;
} private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
{
return true; //总是接受
}
}
}
执行代码如下：
public static void GetLinceNo()
{
using (TPMSEntities context = new TPMSEntities())
{
List<dc_cb_SupplierLinceNo> lst = new List<dc_cb_SupplierLinceNo>();
var data = context.dc_p_Provider_temp2019.ToList();
foreach(var item in data)
{
if (!string.IsNullOrEmpty(item.LicenceNo))
{
continue;
}
string uri = string.Format("https://www.creditchina.gov.cn/api/public_search/getCreditCodeFacade?keyword={0}&_={1}", item.SupplierName, GetTimestamp(DateTime.Now)); var json = HttpWebResponseUtility.GetUrl(uri);
if (!string.IsNullOrEmpty(json))
{
try
{
var jsonResult = JsonConvert.DeserializeObject<res>(json); if (jsonResult != null && jsonResult.result != null && jsonResult.result.results != null)
{
var model = jsonResult.result.results.Where(A => A.entName == item.SupplierName).FirstOrDefault();
if (model == null)
{
continue;
}
string credCode = model.credCode;
dc_cb_SupplierLinceNo d = new dc_cb_SupplierLinceNo();
d.SupplierName = item.SupplierName;
d.LinceNo = credCode;
context.dc_cb_SupplierLinceNo.Add(d);
context.SaveChanges();
}
else
{
continue;
}
}
catch(Exception ex)
{
continue;
}
}
else
{
continue;
} }
//using (var Transaction = context.Database.BeginTransaction())
//{
// try
// { // Transaction.Commit();
// }
// catch (Exception ex)
// {
// Transaction.Rollback();
// }
//}
}
} public static string GetTimestamp(DateTime d)
{
TimeSpan ts = d - new DateTime(, , );
return ts.TotalMilliseconds.ToString();
}
#endregion public class res
{
public resultCls result { get; set; }
public int totalPageCount { get; set; }
} public class resultCls
{
public string start { get; set; }
public string pageSize { get; set; }
public string totalCount { get; set; }
public List<resultsCls> results { get; set; }
public string exportButtonValid { get; set; }
public string currentPageNo { get; set; }
public string page { get; set; }
public string totalPageCount { get; set; } } public class resultsCls
{
public string id { get; set; }
public string entName { get; set; }
public string credCode { get; set; }
public string regCode { get; set; }
public string orgCode { get; set; }
public string taxCode { get; set; } public string status { get; set; }
public string modifyDate { get; set; }
public string md5 { get; set; }
public string rank { get; set; }
public string solrStatus { get; set; }
public string validTime { get; set; }
}
虽说免费，但是这个方法服务端会限制请求的次数！
@陈卧龙的博客