后台web请求
namespace XXXX.Utilites
{
using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Text; public class PostHttpResponse
{
#region Static Field
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)";
#endregion #region public Method
public static string PostHttpResponseJson(string url)
{
string json = string.Empty;
Encoding encoding = Encoding.UTF8;
HttpWebResponse Response = CreatePostHttpResponseJson(url,null,null, null, null, encoding, null);
json = GetStream(Response, encoding);
return json;
} public static string PostHttpResponseJson(string url, string postJson)
{
string json = string.Empty;
Encoding encoding = Encoding.UTF8;
HttpWebResponse Response = CreatePostHttpResponseJson(url, postJson, null, null, null, encoding, null);
json = GetStream(Response, encoding);
return json;
} /// <summary>
/// 创建POST方式Json数据的HTTP请求（包括了https站点请求）
/// </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 CreatePostHttpResponseJson(string url, string postJson,string parameters, int? timeout, string userAgent, Encoding requestEncoding, string referer)
{
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";
//服务端 判断 客户端 提交的是否是 JSON数据 时
request.ContentType = "application/json;charset=UTF-8";
request.KeepAlive = true; if (!string.IsNullOrEmpty(userAgent))
{
request.UserAgent = userAgent;
}
else
{
request.UserAgent = DefaultUserAgent;
} if (timeout.HasValue)
{
request.Timeout = timeout.Value;
} //如果需要POST数据
#region post parameter 类似querystring格式
if (parameters != null)
{
byte[] data = requestEncoding.GetBytes(parameters);
using (Stream stream = request.GetRequestStream())
{
stream.Write(data, , data.Length);
stream.Close();
}
}
#endregion #region post json
if (!string.IsNullOrEmpty(postJson))
{
using (var streamWriter = new StreamWriter(request.GetRequestStream()))
{
//string json = "{\"user\":\"test\"," +
// "\"password\":\"bla\"}"; streamWriter.Write(postJson);
streamWriter.Flush();
streamWriter.Close();
}
}
#endregion if (!string.IsNullOrEmpty(referer))
{
request.Referer = referer;
} HttpWebResponse response = request.GetResponse() as HttpWebResponse; if (request.CookieContainer != null)
{
response.Cookies = request.CookieContainer.GetCookies(request.RequestUri);
} return response;
} #endregion #region Private Method
private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
{
return true; //总是接受
} /// <summary>
/// 将response转换成文本
/// </summary>
/// <param name="response"></param>
/// <param name="encoding"></param>
/// <returns></returns>
private static string GetStream(HttpWebResponse response, Encoding encoding)
{
try
{
if (response.StatusCode == HttpStatusCode.OK)
{
switch (response.ContentEncoding.ToLower())
{
case "gzip":
{
string result = Decompress(response.GetResponseStream(), encoding);
response.Close();
return result;
}
default:
{
using (StreamReader sr = new StreamReader(response.GetResponseStream(), encoding))
{
string result = sr.ReadToEnd();
sr.Close();
sr.Dispose();
response.Close();
return result;
}
}
}
}
else
{
response.Close();
}
}
catch (Exception e)
{
throw e;
}
return "";
} private static string Decompress(Stream stream, Encoding encoding)
{
byte[] buffer = new byte[];
//int length = 0; using (GZipStream gz = new GZipStream(stream, CompressionMode.Decompress))
{
//GZipStream gzip = new GZipStream(res.GetResponseStream(), CompressionMode.Decompress);
using (StreamReader reader = new StreamReader(gz, encoding))
{
return reader.ReadToEnd();
}
/*
using (MemoryStream msTemp = new MemoryStream())
{
//解压时直接使用Read方法读取内容，不能调用GZipStream实例的Length等属性，否则会出错：System.NotSupportedException: 不支持此操作；
while ((length = gz.Read(buffer, 0, buffer.Length)) != 0)
{
msTemp.Write(buffer, 0, length);
} return encoding.GetString(msTemp.ToArray());
}
* */
}
} #endregion
}
}