使用HtmlAgilityPack批量抓取网页数据

原文: 使用HtmlAgilityPack批量抓取网页数据

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登录的处理。因为有些网页数据需要登陆后才能提取。这里要使用ieHTTPHeaders来提取登录时的提交信息。

抓取网页

 HtmlAgilityPack.HtmlDocument htmlDoc;

             if  ( ! string .IsNullOrEmpty(登录URL))
             {
                htmlDoc  =  htmlWeb.Load(登录URL, 提交的用户验证信息, 获取数据的网页URL);
            }
             else
             {
                htmlDoc  =  htmlWeb.Load(获取数据的网页URL);
            }
        

 

 

 ArrayList list  =   new  ArrayList();
            list.add( " //table/tr[1]/td " );
            list.add( " //table/tr[2]/td " );
             // 获取循环的节点的xpath，比如： // table/tr
            HtmlNodeCollection repeatNodes  =  htmlDoc.DocumentNode.SelectNodes( " //table/tr " );

             // 循环节点
             foreach  (HtmlNode node  in  repeatNodes)
             {
                 // 循环获取数据
                 foreach  ( string  dataPath  in  list)
                 {

                    HtmlNode dataNode  =  node.SelectSingleNode(list);
                     if  (dataNode  !=   null )
                     {
                         string  text  =  dataNode.InnerText;
                    }

                }
            }

如果出现乱码，调整编码集为gb2312或者是utf-8

htmlWeb.DefaultEncoding  =  System.Text.Encoding.GetEncoding(strEncode);

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using System;

using System.Collections.Generic;

using System.Text;

using Microsoft.VisualStudio.TestTools.WebTesting;

using HtmlAgilityPack;

public class WebTest1Coded : WebTest

{

public override IEnumerator<WebTestRequest> GetRequestEnumerator()

{

WebTestRequest request1 = new WebTestRequest("http://www.microsoft.com/");

request1.ValidateResponse += new EventHandler<ValidationEventArgs>(request1_ValidateResponse);

yield return request1;

}

void request1_ValidateResponse(object sender, ValidationEventArgs e)

{

//load the response body string as an HtmlAgilityPack.HtmlDocument

HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();

doc.LoadHtml(e.Response.BodyString);

//locate the "Nav" element

HtmlNode navNode = doc.GetElementbyId("Nav");

//pick the first <li> element

HtmlNode firstNavItemNode = navNode.SelectSingleNode(".//li");

//validate the first list item in the Nav element says "Windows"

e.IsValid = firstNavItemNode.InnerText == "Windows";

}

}