Web爬虫的C#请求发送

public class HttpControler
{
//post请求发送
private Encoding m_Encoding = Encoding.GetEncoding("gb2312");
public string Request(string strUrl,string postStr)
{
HttpWebRequest tHWRq = (HttpWebRequest)HttpWebRequest.Create(strUrl);
tHWRq.CookieContainer = new CookieContainer();
CookieContainer cookie = tHWRq.CookieContainer;//如果用不到Cookie，删去即可
//以下是发送的http头，随便加，其中referer挺重要的，有些网站会根据这个来反盗链
tHWRq.Referer = "http://www.cninfo.com.cn/cninfo-new/announcement/show";
tHWRq.Accept = "application/json, text/javascript, */*; q=0.01";
tHWRq.Headers["Accept-Language"] = "zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3";
//tHWRq.Headers["Accept-Charset"] = "GBK,utf-8;q=0.7,*;q=0.3";
tHWRq.Headers["Accept-Encoding"] = "gzip, deflate";
tHWRq.UserAgent = "User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0";
tHWRq.KeepAlive = true;
//上面的http头看情况而定，但是下面俩必须加
tHWRq.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";
tHWRq.Method = "POST";
tHWRq.Timeout = * ; Encoding encoding = Encoding.UTF8;//根据网站的编码自定义 byte[] postData = encoding.GetBytes(postStr);//postDataStr即为发送的数据，格式还是和上次说的一样 try
{
tHWRq.ContentLength = postData.Length;
Stream requestStream = tHWRq.GetRequestStream();
requestStream.Write(postData, , postData.Length);
requestStream.Close();
using (HttpWebResponse tHWRp = (HttpWebResponse)tHWRq.GetResponse())
{
using (Stream tStreamRp = tHWRp.GetResponseStream())
{
using (StreamReader tSR = new StreamReader(tStreamRp, m_Encoding))
{
string result = tSR.ReadToEnd();
tHWRq.Abort();
return result;//请求响应后返回的内容
}
}
}
}
catch (Exception e)
{
try
{
tHWRq.Abort();
}
catch (Exception err)
{
throw err;
}
return "NoUrl";
} } //Get请求发送
public bool RequestCode(string strUrl,string path)
{
HttpWebRequest tHWRq = (HttpWebRequest)HttpWebRequest.Create(strUrl);
tHWRq.CookieContainer = new CookieContainer();
CookieContainer cookie = tHWRq.CookieContainer;//如果用不到Cookie，删去即可
//以下是发送的http头，随便加，其中referer挺重要的，有些网站会根据这个来反盗链
tHWRq.Referer = "http://www.cninfo.com.cn/cninfo-new/announcement/show";
tHWRq.Accept = "application/json, text/javascript, */*; q=0.01";
tHWRq.Headers["Accept-Language"] = "zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3";
tHWRq.Headers["Accept-Charset"] = "GBK,utf-8;q=0.7,*;q=0.3";
tHWRq.UserAgent = "User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0";
tHWRq.KeepAlive = true;
//上面的http头看情况而定，但是下面俩必须加
tHWRq.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";
tHWRq.Method = "GET";
tHWRq.Timeout = * ;
string result = null;
try
{
using (HttpWebResponse tHWRp = (HttpWebResponse)tHWRq.GetResponse())
{
using (Stream tStreamRp = tHWRp.GetResponseStream())
{
using (StreamReader tSR = new StreamReader(tStreamRp))
{
result = tSR.ReadToEnd();
}
}
}
//正则表达式过滤想要的内容
string patternCode = "\"code\":\"\\d{6,}\"";
List<string> lstCode = new List<string>();
Regex rgxUrl = new Regex(patternCode, RegexOptions.IgnoreCase);
MatchCollection matches = rgxUrl.Matches(result);
if (matches.Count > )
{
foreach (Match matPage in matches)
{
string codeItem = matPage.Value;
if (!string.IsNullOrEmpty(codeItem))
{
string code = codeItem.Substring(codeItem.IndexOf(":") + );
lstCode.Add(code);
}
}
} using (FileStream fs = new FileStream(path, FileMode.Create, FileAccess.Write))
{
using (StreamWriter sw = new StreamWriter(fs))
{
foreach (string code in lstCode)
{
sw.WriteLine(code);
} }
}
tHWRq.Abort();
return true;
}
catch (Exception e)
{
try
{
tHWRq.Abort();
}
catch (Exception err)
{
throw err;
}
return false;
}
}
}