C# HTTP系列1 HttpWebRequest类

HttpWebRequest webRequest = WebRequest.Create(url) as HttpWebRequest;

HttpWebResponse webResponse = webRequest.GetResponse() as HttpWebResponse;

using (StreamReader sr = new StreamReader(webResponse.GetResponseStream()))
{
   string content = sr.ReadToEnd();
}

 1 /// <summary>
 2 ///  HTTP请求(包含文本的body数据)
 3 /// </summary>
 4 /// <param name="url">请求目标URL</param>
 5 /// <param name="data">主体数据(普通文本或者JSON文本)</param>
 6 /// <param name="method">请求的方法。请使用 WebRequestMethods.Http 的枚举值</param>
 7 /// <param name="contentType"><see langword="Content-type" /> HTTP 标头的值。请使用 ContentType 类的常量来获取</param>
 8 /// <returns></returns>
 9 private HttpResult Request(string url, string data, string method, string contentType)
10 {
11     HttpResult httpResult = new HttpResult();
12     HttpWebRequest webRequest = null;
13 
14     try
15     {
16         webRequest = WebRequest.Create(url) as HttpWebRequest;
17         webRequest.Method = method;
18         webRequest.Headers = HeaderCollection;
19         webRequest.CookieContainer = CookieContainer;
20         webRequest.ContentType = contentType;
21         webRequest.UserAgent = _userAgent;
22         webRequest.AllowAutoRedirect = _allowAutoRedirect;
23         webRequest.ServicePoint.Expect100Continue = false;
24 
25         if (data != null)
26         {
27             webRequest.AllowWriteStreamBuffering = true;
28             using (Stream requestStream = webRequest.GetRequestStream())
29             {
30                 requestStream.Write(EncodingType.GetBytes(data), 0, data.Length);
31                 requestStream.Flush();
32             }
33         }
34 
35         HttpWebResponse webResponse = webRequest.GetResponse() as HttpWebResponse;
36         if (webResponse != null)
37         {
38             GetResponse(ref httpResult, webResponse);
39             webResponse.Close();
40         }
41     }
42     catch (WebException webException)
43     {
44         GetWebExceptionResponse(ref httpResult, webException);
45     }
46     catch (Exception ex)
47     {
48         GetExceptionResponse(ref httpResult, ex, method, contentType);
49     }
50     finally
51     {
52         if (webRequest != null)
53         {
54             webRequest.Abort();
55         }
56     }
57 
58     return httpResult;
59 }

 1 /// <summary>
 2 /// 获取HTTP访问网络期间发生错误时引发的异常响应信息
 3 /// </summary>
 4 /// <param name="httpResult">即将被HTTP请求封装函数返回的HttpResult变量</param>
 5 /// <param name="webException">访问网络期间发生错误时引发的异常对象</param>
 6 private void GetWebExceptionResponse(ref HttpResult httpResult, WebException webException)
 7 {
 8     HttpWebResponse exResponse = webException.Response as HttpWebResponse;
 9     if (exResponse != null)
10     {
11         httpResult.HttpWebResponse = exResponse;
12         httpResult.Status = HttpResult.STATUS_FAIL;
13         httpResult.StatusDescription = exResponse.StatusDescription;
14         httpResult.StatusCode = (int)exResponse.StatusCode;
15 
16         httpResult.RefCode = httpResult.StatusCode;
17         using (StreamReader sr = new StreamReader(exResponse.GetResponseStream(), EncodingType))
18         {
19             httpResult.Text = sr.ReadToEnd();
20             httpResult.RefText = httpResult.Text;
21         }
22 
23         exResponse.Close();
24     }
25 }