Beispiel #1
0
        public static void DownloadFile(string url, string target)
        {
            var config = new HttpConfig();

            try
            {
                using (HttpWebResponse response = GetResponse(url, "GET", null, config))
                {
                    Stream stream = response.GetResponseStream();

                    if (!string.IsNullOrEmpty(response.ContentEncoding))
                    {
                        if (response.ContentEncoding.Contains("gzip"))
                        {
                            stream = new GZipStream(stream, CompressionMode.Decompress);
                        }
                        else if (response.ContentEncoding.Contains("deflate"))
                        {
                            stream = new DeflateStream(stream, CompressionMode.Decompress);
                        }
                    }

                    using (var fileStream = new FileStream(target, FileMode.Create))
                    {
                        int    count;
                        byte[] buffer = new byte[4096];
                        while ((count = stream.Read(buffer, 0, buffer.Length)) > 0)
                        {
                            fileStream.Write(buffer, 0, count);
                        }
                    }
                }
            }
            catch
            {
            }
        }
Beispiel #2
0
        public static string Send(string url, string method, string data, HttpConfig config)
        {
            if (config == null)
            {
                config = new HttpConfig();
            }
            string result;

            using (HttpWebResponse response = GetResponse(url, method, data, config))
            {
                Stream stream = response.GetResponseStream();

                if (!string.IsNullOrEmpty(response.ContentEncoding))
                {
                    if (response.ContentEncoding.Contains("gzip"))
                    {
                        stream = new GZipStream(stream, CompressionMode.Decompress);
                    }
                    else if (response.ContentEncoding.Contains("deflate"))
                    {
                        stream = new DeflateStream(stream, CompressionMode.Decompress);
                    }
                }

                byte[] bytes = null;
                using (MemoryStream ms = new MemoryStream())
                {
                    int    count;
                    byte[] buffer = new byte[4096];
                    while ((count = stream.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        ms.Write(buffer, 0, count);
                    }
                    bytes = ms.ToArray();
                }

                #region 检测流编码
                Encoding encoding;

                //检测响应头是否返回了编码类型,若返回了编码类型则使用返回的编码
                //注:有时响应头没有编码类型,CharacterSet经常设置为ISO-8859-1
                if (!string.IsNullOrEmpty(response.CharacterSet) && response.CharacterSet.ToUpper() != "ISO-8859-1")
                {
                    encoding = Encoding.GetEncoding(response.CharacterSet == "utf8" ? "utf-8" : response.CharacterSet);
                }
                else
                {
                    //若没有在响应头找到编码,则去html找meta头的charset
                    result = Encoding.Default.GetString(bytes);
                    //在返回的html里使用正则匹配页面编码
                    Match match = Regex.Match(result, @"<meta.*charset=""?([\w-]+)""?.*>", RegexOptions.IgnoreCase);
                    if (match.Success)
                    {
                        encoding = Encoding.GetEncoding(match.Groups[1].Value);
                    }
                    else
                    {
                        //若html里面也找不到编码,默认使用utf-8
                        encoding = Encoding.GetEncoding(config.CharacterSet);
                    }
                }
                #endregion

                result = encoding.GetString(bytes);
            }
            return(result);
        }
Beispiel #3
0
 public static string GET(string url, HttpConfig config)
 {
     return(Send(url, "GET", null, config));
 }
Beispiel #4
0
 public static string POST(string url, string data, HttpConfig config)
 {
     return(Send(url, "POST", data, config));
 }
Beispiel #5
0
        private static HttpWebResponse GetResponse(string url, string method, string data, HttpConfig config)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

            request.Method  = method;
            request.Referer = config.Referer;
            //有些页面不设置用户代理信息则会抓取不到内容
            request.UserAgent = config.UserAgent;
            request.Timeout   = config.Timeout;
            request.Accept    = config.Accept;
            request.Headers.Set("Accept-Encoding", config.AcceptEncoding);
            request.ContentType = config.ContentType;
            request.KeepAlive   = config.KeepAlive;

            if (url.ToLower().StartsWith("https"))
            {
                //这里加入解决生产环境访问https的问题--Could not establish trust relationship for the SSL/TLS secure channel
                ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(RemoteCertificateValidate);
            }


            if (method.ToUpper() == "POST")
            {
                if (!string.IsNullOrEmpty(data))
                {
                    byte[] bytes = Encoding.UTF8.GetBytes(data);

                    if (config.GZipCompress)
                    {
                        using (MemoryStream stream = new MemoryStream())
                        {
                            using (GZipStream gZipStream = new GZipStream(stream, CompressionMode.Compress))
                            {
                                gZipStream.Write(bytes, 0, bytes.Length);
                            }
                            bytes = stream.ToArray();
                        }
                    }

                    request.ContentLength = bytes.Length;
                    request.GetRequestStream().Write(bytes, 0, bytes.Length);
                }
                else
                {
                    request.ContentLength = 0;
                }
            }

            return((HttpWebResponse)request.GetResponse());
        }