/// <summary>
/// 有关HTTP请求的辅助类
/// </summary>
public class HttpWebResponseUtility
{
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,无需cookies验证
/// </summary>
/// <param name="url">请求的URL</param>
/// <param name="timeout">请求的超时时间</param>
/// <returns></returns>
public static HttpWebResponse CreateGetHttpResponse(string url, int? timeout)
{
return CreateGetHttpResponse(url, timeout, DefaultUserAgent, null);
}
/// <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 == 0))
{
StringBuilder buffer = new StringBuilder();
int i = 0;
foreach (string key in parameters.Keys)
{
if (i > 0)
{
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, 0, data.Length);
}
}
return request.GetResponse() as HttpWebResponse;
}
/// <summary>
/// 获取POST方式的响应数据
/// </summary>
/// <param name="url"></param>
/// <param name="parameters"></param>
/// <param name="timeout"></param>
/// <param name="userAgent"></param>
/// <param name="requestEncoding"></param>
/// <param name="cookies"></param>
/// <returns></returns>
public static string HttpPost(string url, IDictionary<string, string> parameters, int? timeout, string userAgent, Encoding requestEncoding, CookieCollection cookies)
{
using (var response = CreatePostHttpResponse(url, parameters, timeout, userAgent, requestEncoding, cookies))
using (var reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
return reader.ReadToEnd();
}
/// <summary>
/// 获取POST方式的响应数据
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="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>转换后的实体</returns>
public static T HttpPost<T>(string url, IDictionary<string, string> parameters, int? timeout, string userAgent, Encoding requestEncoding, CookieCollection cookies) where T : class
{
var json = HttpPost(url, parameters, timeout, userAgent, requestEncoding, cookies);
if (string.IsNullOrEmpty(json)) return null;
return JsonConvert.DeserializeObject<T>(json.Trim());
}
/// <summary>
/// 获取Get方式的响应数据
/// </summary>
/// <param name="url"></param>
/// <param name="timeout"></param>
/// <param name="userAgent"></param>
/// <param name="cookies"></param>
/// <returns></returns>
public static string HttpGet(string url, int? timeout, string userAgent, CookieCollection cookies)
{
using (var response = CreateGetHttpResponse(url, timeout, userAgent, cookies))
using (var reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
return reader.ReadToEnd();
}
/// <summary>
/// 获取Get方式的响应数据
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="url"></param>
/// <param name="timeout"></param>
/// <param name="userAgent"></param>
/// <param name="cookies"></param>
/// <returns></returns>
public static T HttpGet<T>(string url, int? timeout, string userAgent, CookieCollection cookies) where T : class
{
var json = HttpGet(url, timeout, userAgent, cookies);
if (string.IsNullOrEmpty(json)) return null;
return JsonConvert.DeserializeObject<T>(json.Trim());
}
/// <summary>
/// 获取Get方式的响应数据
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="url"></param>
/// <param name="timeout"></param>
/// <returns></returns>
public static T HttpGet<T>(string url, int? timeout) where T : class
{
return HttpGet<T>(url, timeout, DefaultUserAgent, null);
}
private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
{
return true; //总是接受
}
}
