C# HttpWebRequest Post Get 请求数据

Post请求

 1  //data
 2                 string cookieStr = "Cookie信息";
 3                 string postData = string.Format("userid={0}&password={1}", "参数1", "参数2");
 4                 byte[] data = Encoding.UTF8.GetBytes(postData);
 5
 6                 // Prepare web request...
 7                 HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://www.xxx.com");
 8                 request.Method = "POST";
 9                 //request.Referer = "https://www.xxx.com";
10                 request.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";
11                 request.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36";
12                 //request.Host = "www.xxx.com";
13                 request.Headers.Add("Cookie", cookieStr);
14                 request.ContentLength = data.Length;
15                 Stream newStream = request.GetRequestStream();
16
17                 // Send the data.
18                 newStream.Write(data, 0, data.Length);
19                 newStream.Close();
20
21                 // Get response
22                 HttpWebResponse myResponse = (HttpWebResponse)request.GetResponse();
23                 StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);
24                 string content = reader.ReadToEnd();
25                 Console.WriteLine(content);
26                 Console.ReadLine();  

 1 /// <summary>
 2        /// 创建POST方式的HTTP请求
 3        /// </summary>
 4        /// <param name="url">请求的URL</param>
 5        /// <param name="parameters">随同请求POST的参数名称及参数值字典</param>
 6        /// <param name="timeout">请求的超时时间</param>
 7        /// <param name="userAgent">请求的客户端浏览器信息，可以为空</param>
 8        /// <param name="requestEncoding">发送HTTP请求时所用的编码</param>
 9        /// <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>
10        /// <returns></returns>
11        public static HttpWebResponse CreatePostHttpResponse(string url,IDictionary<string,string> parameters,int? timeout, string userAgent,Encoding requestEncoding,CookieCollection cookies)
12        {
13            if (string.IsNullOrEmpty(url))
14            {
15                throw new ArgumentNullException("url");
16            }
17            if(requestEncoding==null)
18            {
19                throw new ArgumentNullException("requestEncoding");
20            }
21            HttpWebRequest request=null;
22            //如果是发送HTTPS请求
23            if(url.StartsWith("https",StringComparison.OrdinalIgnoreCase))
24            {
25                ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
26                request = WebRequest.Create(url) as HttpWebRequest;
27                request.ProtocolVersion=HttpVersion.Version10;
28            }
29            else
30            {
31                request = WebRequest.Create(url) as HttpWebRequest;
32            }
33            request.Method = "POST";
34            request.ContentType = "application/x-www-form-urlencoded";
35
36            if (!string.IsNullOrEmpty(userAgent))
37            {
38                request.UserAgent = userAgent;
39            }
40            else
41            {
42                request.UserAgent = DefaultUserAgent;
43            }
44
45            if (timeout.HasValue)
46            {
47                request.Timeout = timeout.Value;
48            }
49            if (cookies != null)
50            {
51                request.CookieContainer = new CookieContainer();
52                request.CookieContainer.Add(cookies);
53            }
54            //如果需要POST数据
55            if(!(parameters==null||parameters.Count==0))
56            {
57                StringBuilder buffer = new StringBuilder();
58                int i = 0;
59                foreach (string key in parameters.Keys)
60                {
61                    if (i > 0)
62                    {
63                        buffer.AppendFormat("&{0}={1}", key, parameters[key]);
64                    }
65                    else
66                    {
67                        buffer.AppendFormat("{0}={1}", key, parameters[key]);
68                    }
69                    i++;
70                }
71                byte[] data = requestEncoding.GetBytes(buffer.ToString());
72                using (Stream stream = request.GetRequestStream())
73                {
74                    stream.Write(data, 0, data.Length);
75                }
76            }
77            return request.GetResponse() as HttpWebResponse;
78        }
79 调用
80
81 string loginUrl = "https://passport.baidu.com/?login";
82 string userName = "userName";
83 string password = "password";
84 string tagUrl = "http://cang.baidu.com/"+userName+"/tags";
85 Encoding encoding = Encoding.GetEncoding("gb2312");
86
87 IDictionary<string, string> parameters = new Dictionary<string, string>();
88 parameters.Add("tpl", "fa");
89 parameters.Add("tpl_reg", "fa");
90 parameters.Add("u", tagUrl);
91 parameters.Add("psp_tt", "0");
92 parameters.Add("username", userName);
93 parameters.Add("password", password);
94 parameters.Add("mem_pass", "1");
95 HttpWebResponse response = HttpWebResponseUtility.CreatePostHttpResponse(loginUrl, parameters, null, null, encoding, null);
96 string cookieString = response.Headers["Set-Cookie"]; 

Get请求

 1 /// <summary>
 2        /// 创建GET方式的HTTP请求
 3        /// </summary>
 4        /// <param name="url">请求的URL</param>
 5        /// <param name="timeout">请求的超时时间</param>
 6        /// <param name="userAgent">请求的客户端浏览器信息，可以为空</param>
 7        /// <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>
 8        /// <returns></returns>
 9        public static HttpWebResponse CreateGetHttpResponse(string url,int? timeout, string userAgent,CookieCollection cookies)
10        {
11            if (string.IsNullOrEmpty(url))
12            {
13                throw new ArgumentNullException("url");
14            }
15            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
16            request.Method = "GET";
17            request.UserAgent = DefaultUserAgent;
18            if (!string.IsNullOrEmpty(userAgent))
19            {
20                request.UserAgent = userAgent;
21            }
22            if (timeout.HasValue)
23            {
24                request.Timeout = timeout.Value;
25            }
26            if (cookies != null)
27            {
28                request.CookieContainer = new CookieContainer();
29                request.CookieContainer.Add(cookies);
30            }
31            return request.GetResponse() as HttpWebResponse;
32        } 

1 string userName = "userName";
2 string tagUrl = "http://cang.baidu.com/"+userName+"/tags";
3 CookieCollection cookies = new CookieCollection();//如何从response.Headers["Set-Cookie"];中获取并设置CookieCollection的代码略
4 response = HttpWebResponseUtility.CreateGetHttpResponse(tagUrl, null, null, cookies);