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);

-------------------------------------------------------------------------------------------

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";

}

}

posted on 2009-09-07 01:39  chuncn  阅读(7236)  评论(0编辑  收藏  举报

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