2019-03-19

namespace TagTools
{
    using System;
    using System.IO;
    using System.Net;
    using System.Text;
    using System.Text.RegularExpressions;

    public class HttpHelper
    {
        private static Stream _reader;
        private static StreamReader _responseReader;
        private static HttpWebResponse _webResponse;

        public static void Dispose()
        {
            if (_reader != null)
            {
                _reader.Close();
            }
            if (_responseReader != null)
            {
                _responseReader.Close();
            }
            if (_webResponse != null)
            {
                _webResponse.Close();
            }
            _reader = null;
            _responseReader = null;
            _webResponse = null;
        }

        public static string DoHttp(string httpStr)
        {
            string str;
            HttpWebRequest request = (HttpWebRequest) WebRequest.Create(httpStr);
            request.Method = "GET";
            request.ServicePoint.Expect100Continue = false;
            request.Timeout = 0x7530;
            using (_webResponse = (HttpWebResponse) request.GetResponse())
            {
                _reader = _webResponse.GetResponseStream();
                if (_reader != null)
                {
                    _responseReader = new StreamReader(_reader, Encoding.UTF8);
                    str = _responseReader.ReadToEnd();
                }
                else
                {
                    str = string.Empty;
                }
            }
            if (!string.IsNullOrEmpty(str))
            {
                return str;
            }
            return "返回新闻为空";
        }

        public static string[] GetHtmlImageUrlList(string sHtmlText)
        {
            MatchCollection matchs = new Regex("<img\\b[^<>]*?\\bsrc[\\s\\t\\r\\n]*=[\\s\\t\\r\\n]*[\"']?[\\s\\t\\r\\n]*(?<imgUrl>[^\\s\\t\\r\\n\"'<>]*)[^<>]*?/?[\\s\\t\\r\\n]*>", RegexOptions.IgnoreCase).Matches(sHtmlText);
            int num = 0;
            string[] strArray = new string[matchs.Count];
            foreach (Match match in matchs)
            {
                strArray[num++] = match.Groups["imgUrl"].Value;
            }
            return strArray;
        }

        public static string GetHtmlTxt(string htmlstring)
        {
            htmlstring = Regex.Replace(htmlstring, "<script[^>]*?>.*?</script>", "", RegexOptions.IgnoreCase);
            htmlstring = Regex.Replace(htmlstring, "<(.[^>]*)>", "", RegexOptions.IgnoreCase);
            htmlstring = Regex.Replace(htmlstring, @"([\r\n])[\s]+", "", RegexOptions.IgnoreCase);
            htmlstring = Regex.Replace(htmlstring, "-->", "", RegexOptions.IgnoreCase);
            htmlstring = Regex.Replace(htmlstring, "<!--.*", "", RegexOptions.IgnoreCase);
            htmlstring = Regex.Replace(htmlstring, "&(quot|#34);", "\"", RegexOptions.IgnoreCase);
            htmlstring = Regex.Replace(htmlstring, "&(amp|#38);", "&", RegexOptions.IgnoreCase);
            htmlstring = Regex.Replace(htmlstring, "&(lt|#60);", "<", RegexOptions.IgnoreCase);
            htmlstring = Regex.Replace(htmlstring, "&(gt|#62);", ">", RegexOptions.IgnoreCase);
            htmlstring = Regex.Replace(htmlstring, "&(nbsp|#160);", "   ", RegexOptions.IgnoreCase);
            htmlstring = Regex.Replace(htmlstring, "&(iexcl|#161);", "\x00a1", RegexOptions.IgnoreCase);
            htmlstring = Regex.Replace(htmlstring, "&(cent|#162);", "\x00a2", RegexOptions.IgnoreCase);
            htmlstring = Regex.Replace(htmlstring, "&(pound|#163);", "\x00a3", RegexOptions.IgnoreCase);
            htmlstring = Regex.Replace(htmlstring, "&(copy|#169);", "\x00a9", RegexOptions.IgnoreCase);
            htmlstring = Regex.Replace(htmlstring, @"&#(\d+);", "", RegexOptions.IgnoreCase);
            htmlstring = htmlstring.Replace("<", "");
            htmlstring = htmlstring.Replace(">", "");
            htmlstring = htmlstring.Replace("\r\n", "");
            htmlstring = htmlstring.Replace("ss=\"wzzw\"", "");
            return htmlstring;
        }
    }
}