借助HttpWebRequest 调用第三方接口，获取Token和数据
在一次项目中，在给客户做系统时，需要调用客户的系统获取数据，客户提供了获取Token和获取数据的接口，用户名和密码，认证方式是基于Bearer的，通过学习和找资料，提供一个C#示例一个C#示例
1、传入语句获取数据
/// <summary>
/// 传入语句获取数据
/// </summary>
/// <param name="param"></param>
/// <returns></returns>
public async Task<string> ThirdSystemDataPostAsync(string param,string dataUrlAddress)
{
string token = await Bearer_TokenPostAsync();
_logger.Warn($"获取Token结构：{token}");
string responseString = string.Empty;
try
{
var tokenJson = JsonConvert.DeserializeObject<TokenResultDto>(token);
_logger.Warn($"获取Token值参数据：{tokenJson}");
//跳过ssl验证
ServicePointManager.ServerCertificateValidationCallback = (sender, certificate, chain, sslPolicyErrors) => true;
// 创建HttpWebRequest对象
HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(dataUrlAddress);
_logger.Warn($"入参数据：{param}");
_logger.Warn($"智慧系统数据地址：{dataUrlAddress}");
// 设置Post调⽤⽅法
httpRequest.Method = "Post";
//设置参数传输类型
httpRequest.ContentType = " application/json; charset=utf-8";
// 设置Http Bearer认证的请求头
httpRequest.Headers.Add("Authorization", "Bearer " + tokenJson.accessToken);
//传输参数格式转换
byte[] bytesRequestData = Encoding.UTF8.GetBytes(param);
//_logger.Warn($"入参数据格式转换：{bytesRequestData}");
httpRequest.ContentLength = bytesRequestData.Length;
Stream postStream = await httpRequest.GetRequestStreamAsync();
postStream.Write(bytesRequestData, 0, bytesRequestData.Length);
postStream.Close();
//获取设置身份认证及请求超时时间
SetWebRequest(httpRequest);
// HttpWebRequest发起调⽤
using (HttpWebResponse myResponse = (HttpWebResponse)httpRequest.GetResponse())
{
//myResponse.StatusCode
// StreamReader对象
StreamReader sr = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);
// 返回结果
responseString = sr.ReadToEnd();
_logger.Warn($"调用智慧系统返回结果数据：{responseString}");
return responseString;
}
}
catch (Exception ex)
{
//返回错误信息
responseString = ex.ToString();
}
return responseString;
}2、获取token
/// <summary>
/// 获取token
/// </summary>
/// <returns></returns>
private async Task<string> Bearer_TokenPostAsync(string sSoUrlAddress,string userName,string userPassword)
{
string responseString = string.Empty;
try
{
// 创建HttpWebRequest对象
HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(sSoUrlAddress);
_logger.Warn($"智慧系统Token地址：{sSoUrlAddress}");
// 设置Post调⽤⽅法
httpRequest.Method = "Post";
//设置参数传输类型
httpRequest.ContentType = " application/json; charset=utf-8";
// 设置用户名和密码
var usermesg = new UserMesgInput()
{
Username = userName,
Password = userPassword,
UserDetail = true
};
string base64 = JsonConvert.SerializeObject(usermesg);
//传输参数格式转换
byte[] bytesRequestData = Encoding.UTF8.GetBytes(base64);
//_logger.Warn($"入参数据格式转换：{bytesRequestData}");
httpRequest.ContentLength = bytesRequestData.Length;
Stream postStream = await httpRequest.GetRequestStreamAsync();
postStream.Write(bytesRequestData, 0, bytesRequestData.Length);
postStream.Close();
//获取设置身份认证及请求超时时间
SetWebRequest(httpRequest);
_logger.Warn($"获取设置身份认证及请求超时时间");
// HttpWebRequest发起调⽤
using (HttpWebResponse myResponse = (HttpWebResponse)httpRequest.GetResponse())
{
_logger.Warn($"StreamReader对象");
// StreamReader对象
StreamReader sr = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);
//_logger.Warn($"返回结果{sr.ReadToEnd()}");
// 返回结果
responseString = sr.ReadToEnd();
_logger.Warn($"调用智慧系统返回结果Token：{responseString}");
//return responseString;
}
}
catch (Exception ex)
{
//返回错误信息
responseString = ex.ToString();
}
return responseString;
}3、获取设置身份认证及请求超时时间
/// <summary>
/// 获取设置身份认证及请求超时时间
/// </summary>
/// <param name="request"></param>
private static void SetWebRequest(HttpWebRequest request)
{
request.Credentials = CredentialCache.DefaultCredentials;
request.Timeout = 1000000;
}4、在我使用的时候出现了下面的错误，通过查找是证书的问题，因为客户的web访问使用的IP地址访问，所以在代码中要加入跳过ssl验证的一行代码
System.Net.WebException: The SSL connection could not be established, see inner exception. The remote certificate is invalid according to the validation procedure.
来源:https://www.cnblogs.com/moonstars/p/17276990.html
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