• HttpRequest模拟Post和Get提交代码


    public static class HttpRequestHelper
        {
            private static Encoding DEFAULT_ENCODING = Encoding.UTF8;
            private static string ACCEPT = "application/json, text/javascript, */*; q=0.01";
            private static string CONTENT_TYPE = "application/x-www-form-urlencoded";
            private static string USERAGENT = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.116 Safari/537.36";
    
            public static string GetHtmlContent(string url)
            {
                return GetHtmlContent(url, DEFAULT_ENCODING);
            }
    
            public static string GetHtmlContent(string url, Encoding encoding)
            {
                var request = (HttpWebRequest)WebRequest.Create(url);
                request.UserAgent = USERAGENT;
                request.Credentials = CredentialCache.DefaultCredentials;
                using (var webResponse = (HttpWebResponse)request.GetResponse())
                {
                    var bytes = GetWebResponseData(webResponse);
                    return encoding.GetString(bytes);
                }
            }
    
            public static string GetCookie(string url)
            {
                string cookie = string.Empty;
                var request = WebRequest.Create(url);
                request.Credentials = CredentialCache.DefaultCredentials;
                using (var response = request.GetResponse())
                {
                    cookie = response.Headers.Get("Set-Cookie");
                }
                return cookie;
            }
    
            /// <summary>
            /// 
            /// </summary>
            /// <param name="url"></param>
            /// <param name="data"></param>
            /// <param name="referer"></param>
            /// <param name="cookieHeader">name=value,name=value</param>
            /// <param name="cookies"></param>
            /// <returns></returns>
            public static byte[] Post(string url, byte[] data = null, string[] headers = null, string referer = null, string cookieHeader = null, IList<Cookie> cookies = null)
            {
                return Submit(url, "POST", data, headers, referer, cookieHeader, cookies);
            }
    
            /// <summary>
            /// 
            /// </summary>
            /// <param name="url"></param>
            /// <param name="data"></param>
            /// <param name="referer"></param>
            /// <param name="cookieHeader">name=value,name=value</param>
            /// <param name="cookies"></param>
            /// <param name="headers">name=value,name=value</param>
            /// <returns></returns>
            private static byte[] Submit(string url, string method, byte[] data = null, string[] headers = null, string referer = null, string cookieHeader = null, IList<Cookie> cookies = null)
            {
                if (string.IsNullOrEmpty(url)) throw new ArgumentNullException("url不能为空。");
                if (string.IsNullOrEmpty(method)) throw new ArgumentNullException("method不能为空。");
    
                var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
                httpWebRequest.Accept = ACCEPT;
                httpWebRequest.Referer = referer ?? url;
                httpWebRequest.UserAgent = USERAGENT;
                httpWebRequest.Method = method;
                httpWebRequest.CookieContainer = GetCookieContainer(url, cookieHeader, cookies);
                if (headers != null)
                {
                    foreach (var item in headers)
                    {
                        httpWebRequest.Headers.Add(item);
                    }
                }
                if (method == "POST")
                {
                    httpWebRequest.ContentType = CONTENT_TYPE;
                }
                if (data != null)
                {
                    httpWebRequest.ContentLength = (long)data.Length;
                    using (var stream = httpWebRequest.GetRequestStream())
                    {
                        stream.Write(data, 0, data.Length);
                    }
                }
                using (var webResponse = (HttpWebResponse)httpWebRequest.GetResponse())
                {
                    return GetWebResponseData(webResponse);
                }
            }
    
            private static byte[] GetWebResponseData(HttpWebResponse response)
            {
                using (var stream = response.GetResponseStream())
                {
                    if (response.ContentEncoding.ToLower().Contains("gzip"))
                    {
                        using (var gZipStream = new GZipStream(stream, CompressionMode.Decompress))
                        {
                            var bytes = ReadFully(gZipStream);
                            return bytes;
                        }
                    }
                    else
                    {
                        var bytes = ReadFully(stream);
                        return bytes;
                    }
                }
            }
            private static byte[] ReadFully(Stream stream)
            {
                byte[] buffer = new byte[128];
                byte[] result;
                using (var ms = new MemoryStream())
                {
                    while (true)
                    {
                        int read = stream.Read(buffer, 0, buffer.Length);
                        if (read <= 0)
                        {
                            break;
                        }
                        ms.Write(buffer, 0, read);
                    }
                    result = ms.ToArray();
                }
                return result;
            }
    
            /// <summary>
            /// 
            /// </summary>
            /// <param name="url"></param>
            /// <param name="cookieHeader">name=value,name=value</param>
            /// <param name="cookies"></param>
            /// <returns></returns>
            public static byte[] Get(string url, string[] headers = null, string referer = null, string cookieHeader = null, IList<Cookie> cookies = null)
            {
                return Submit(url, "GET", null, headers, referer, cookieHeader, cookies);
            }
    
            private static CookieContainer GetCookieContainer(string url, string cookieHeader = null, IList<Cookie> cookies = null)
            {
                if (string.IsNullOrEmpty(cookieHeader) && (cookies == null || cookies.Count == 0)) return null;
                var container = new CookieContainer();
                if (!string.IsNullOrEmpty(cookieHeader))
                {
                    container.SetCookies(new Uri(url), cookieHeader);
                }
                if (cookies != null)
                {
                    foreach (var item in cookies)
                    {
                        container.Add(item);
                    }
                }
                return container;
            }
        }
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  • 原文地址:https://www.cnblogs.com/liubiaocai/p/2763893.html
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