三种asp.net 抓取网页源码实现(asp.net采集，读取源码)
写法1 比较推荐
/// <summary>
/// 用HttpWebRequest取得网页源码
/// 对于带BOM的网页很有效，不管是什么编码都能正确识别
/// </summary>
/// <param name="url">网页地址" </param>
/// <returns>返回网页源文件</returns>
public static string GetHtmlSource2(string url)
{
//处理内容
string html = "";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Accept = "*/*"; //接受任意文件
request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.1.4322)"; // 模拟使用IE在浏览 http://www.52mvc.com
request.AllowAutoRedirect = true;//是否允许302
//request.CookieContainer = new CookieContainer();//cookie容器，
request.Referer = url; //当前页面的引用
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream stream = response.GetResponseStream();
StreamReader reader = new StreamReader(stream, Encoding.Default);
html = reader.ReadToEnd();
stream.Close();
return html;
}
写法2
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using System.Text;
using System.Net;
namespace MySql
{
public class GetHttpData
{
public static string GetHttpData2(string Url)
{
string sException = null;
string sRslt = null;
WebResponse oWebRps = null;
WebRequest oWebRqst = WebRequest.Create(Url);
oWebRqst.Timeout = 50000;
try
{
oWebRps = oWebRqst.GetResponse();
}
catch (WebException e)
{
sException = e.Message.ToString();
}
catch (Exception e)
{
sException = e.ToString();
}
finally
{
if (oWebRps != null)
{
StreamReader oStreamRd = new StreamReader(oWebRps.GetResponseStream(), Encoding.GetEncoding("utf-8"));
sRslt = oStreamRd.ReadToEnd();
oStreamRd.Close();
oWebRps.Close();
}
}
return sRslt;
}
}
}
写法3
public static string getHtml(string url, params string [] charSets)//url是要访问的网站地址，charSet是目标网页的编码，如果传入的是null或者""，那就自动分析网页的编码
{
try
{
string charSet = null;
if (charSets.Length == 1) {
