///<summary>
///采用https协议访问网络,根据传入的URl地址，得到响应的数据字符串。
///</summary>
///<param name="objhttpItem">参数列表</param>
///<returns>String类型的数据</returns>
public string GetHtml(HttpItem objhttpItem)
{
//准备参数
SetRequest(objhttpItem);
//调用专门读取数据的类
return GetHttpRequestData(objhttpItem);
}
/// <summary>
/// 为请求准备参数
/// </summary>
///<param name="objhttpItem">参数列表</param>
/// <param name="_Encoding">读取数据时的编码方式</param>
private void SetRequest(HttpItem objhttpItem)
{
#region 验证证书
if (!string.IsNullOrEmpty(objhttpItem.CerPath))
{
//这一句一定要写在创建连接的前面。使用回调的方法进行证书验证。
ServicePointManager.ServerCertificateValidationCallback =
new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);
//初始化对像，并设置请求的URL地址
request = (HttpWebRequest)WebRequest.Create(GetUrl(objhttpItem.URL));
//创建证书文件
X509Certificate objx509 = new X509Certificate(objhttpItem.CerPath);
//添加到请求里
request.ClientCertificates.Add(objx509);
}
else
{
try
{
//初始化对像，并设置请求的URL地址
request = (HttpWebRequest)WebRequest.Create(GetUrl(objhttpItem.URL));
}
catch (Exception)
{
return;
}
}
#endregion
#region 设置代理
if (string.IsNullOrEmpty(objhttpItem.ProxyUserName) && string.IsNullOrEmpty(objhttpItem.ProxyPwd) && string.IsNullOrEmpty(objhttpItem.ProxyIp))
{
//不需要设置
}
else
{
//设置代理服务器
WebProxy myProxy = new WebProxy(objhttpItem.ProxyIp, false);
//建议连接
myProxy.Credentials = new NetworkCredential(objhttpItem.ProxyUserName, objhttpItem.ProxyPwd);
//给当前请求对象
request.Proxy = myProxy;
//设置安全凭证
request.Credentials = CredentialCache.DefaultNetworkCredentials;
}
#endregion
//请求方式Get或者Post
request.Method = objhttpItem.Method;
//Accept
request.Accept = objhttpItem.Accept;
//ContentType返回类型
request.ContentType = objhttpItem.ContentType;
//UserAgent客户端的访问类型，包括浏览器版本和操作系统信息
request.UserAgent = objhttpItem.UserAgent;
#region 编码
if (string.IsNullOrEmpty(objhttpItem.Encoding.ToLower().Trim()) || objhttpItem.Encoding.ToLower().Trim() == "null")
{
//读取数据时的编码方式
encoding = null;
}
else
{
//读取数据时的编码方式
encoding = System.Text.Encoding.GetEncoding(objhttpItem.Encoding);
}
#endregion
#region Cookie
if (!string.IsNullOrEmpty(objhttpItem.Cookie))
{
//设置Cookie
request.CookieContainer.Add(objhttpItem.CookieCollection);
}
else
{
//Cookie
request.Headers[HttpRequestHeader.Cookie] = objhttpItem.Cookie;
}
#endregion
//来源地址
request.Referer = objhttpItem.Referer;
//是否执行跳转功能
request.AllowAutoRedirect = objhttpItem.Allowautoredirect;
#region Post数据
//验证在得到结果时是否有传入数据
if (!string.IsNullOrEmpty(objhttpItem.Postdata) && request.Method.Trim().ToLower().Contains("post"))
{
byte[] buffer = encoding.GetBytes(objhttpItem.Postdata);
request.ContentLength = buffer.Length;
request.GetRequestStream().Write(buffer, 0, buffer.Length);
}
#endregion
//设置最大连接
if (objhttpItem.Connectionlimit > 0)
{
request.ServicePoint.ConnectionLimit = objhttpItem.Connectionlimit;
}
}
/// <summary>
/// 根据相传入的数据，得到相应页面数据
/// </summary>
/// <param name="strPostdata">传入的数据Post方式,get方式传NUll或者空字符串都可以</param>
/// <returns>string类型的响应数据</returns>
private string GetHttpRequestData(HttpItem objhttpitem)
{
try
{
#region 得到请求的response
if (request != null)
using (response = (HttpWebResponse)request.GetResponse())
{
try
{
objhttpitem.CookieCollection = response.Cookies;
if (response.Headers["set-cookie"] != null)
objhttpitem.Cookie = response.Headers["set-cookie"].Trim();
}
catch (Exception ex) { }
objhttpitem.Response = response;
objhttpitem.Request = request;
//从这里开始我们要无视编码了
if (encoding == null)
{
MemoryStream _stream = new MemoryStream();
if (response.ContentEncoding != null && response.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase))
{
objhttpitem.Reader = reader;
//开始读取流并设置编码方式
//new GZipStream(response.GetResponseStream(), CompressionMode.Decompress).CopyTo(_stream, 10240);
//.net4.0以下写法
_stream = GetMemoryStream(response.GetResponseStream());
}
else
{
objhttpitem.Reader = reader;
//response.GetResponseStream().CopyTo(_stream, 10240);
// .net4.0以下写法
_stream = GetMemoryStream(response.GetResponseStream());
}
byte[] RawResponse = _stream.ToArray();
string temp = Encoding.Default.GetString(RawResponse, 0, RawResponse.Length);
//<meta(.*?)charset([\s]?)=[^>](.*?)>
Match meta = Regex.Match(temp, "<meta([^<]*)charset=([^<]*)[\"']", RegexOptions.IgnoreCase | RegexOptions.Multiline);
string charter = (meta.Groups.Count > 2) ? meta.Groups[2].Value : string.Empty;
charter = charter.Replace("\"", string.Empty).Replace("'", string.Empty).Replace(";", string.Empty);
if (charter.Length > 0)
{
charter = charter.ToLower().Replace("iso-8859-1", "gbk");
encoding = Encoding.GetEncoding(charter);
}
else
{
if (response.CharacterSet.ToLower().Trim() == "iso-8859-1")
{
encoding = Encoding.GetEncoding("gbk");
}
else
{
if (string.IsNullOrEmpty(response.CharacterSet.Trim()))
{
encoding = Encoding.UTF8;
}
else
{
encoding = Encoding.GetEncoding(response.CharacterSet);
}
}
}
returnData = encoding.GetString(RawResponse);
}
else
{
if (response.ContentEncoding != null && response.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase))
{
//开始读取流并设置编码方式
using (reader = new StreamReader(new GZipStream(response.GetResponseStream(), CompressionMode.Decompress), encoding))
{
objhttpitem.Reader = reader;
returnData = reader.ReadToEnd();
}
}
else
{
//开始读取流并设置编码方式
using (reader = new StreamReader(response.GetResponseStream(), encoding))
{
// objhttpitem.Reader = reader;
returnData = reader.ReadToEnd();
}
}
}
}
#endregion
}
catch (WebException ex)
{
//这里是在发生异常时返回的错误信息
returnData = "String Error";
response = (HttpWebResponse)ex.Response;
objhttpitem.Response = response;
}
if (objhttpitem.IsToLower)
{
returnData = returnData.ToLower();
}
return returnData;
}