阅读目录
1、分析html规则
2、C#完整代码
3、最后效果
心血来潮，想研究下爬虫，爬点小说。
通过百度选择了个小说网站，随便找了一本小书http://www.23us.so/files/article/html/13/13655/index.html。
一、分析html规则
思路是获取小说章节目录，循环目录，抓取所有章节中的内容，拼到txt文本中。最后形成完本小说。
1、获取小说章节目录
通过分析，我在标注的地方获取小说名字及章节目录。
<meta name="keywords" content="无疆,无疆最新章节,无疆全文阅读"/>// 获取小说名字
<table cellspacing="1" cellpadding="0" bgcolor="#E4E4E4" id="at">// 所有的章节都在这个table中。
下面是利用正则，获取名字与目录。
// 获取小说名字
Match ma_name = Regex.Match(html, @"<meta name=""keywords"".+content=""(.+)""/>");
string name = ma_name.Groups[1].Value.ToString().Split(',')[0];
// 获取章节目录
Regex reg_mulu = new Regex(@"<table cellspacing=""1"" cellpadding=""0"" bgcolor=""#E4E4E4"" id=""at"">(.|\n)*?</table>");
var mat_mulu = reg_mulu.Match(html);
string mulu = mat_mulu.Groups[0].ToString();
2、获取小说正文内容
通过章节a标签中的url地址，查看章节内容。
通过分析，正文内容在<dd id="contents">中。
// 获取正文
Regex reg = new Regex(@"<dd id=""contents"">(.|\n)*?</dd>");
MatchCollection mc = reg.Matches(html_z);
var mat = reg.Match(html_z);
string content = mat.Groups[0].ToString().Replace("<dd id=\"contents\">", "").Replace("</dd>", "").Replace(" ", "").Replace("<br />", "\r\n");
二、C#完整代码
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;
using System.Web.Mvc;
namespace Test.Controllers
{
public class CrawlerController : BaseController
{
// GET: Crawler
public void Index()
{
//抓取整本小说
CrawlerController cra = new CrawlerController();// 顶点抓取小说网站小说
string html = cra.HttpGet("http://www.23us.so/files/article/html/13/13655/index.html", "");
// 获取小说名字
Match ma_name = Regex.Match(html, @"<meta name=""keywords"".+content=""(.+)""/>");
string name = ma_name.Groups[1].Value.ToString().Split(',')[0];
// 获取章节目录
Regex reg_mulu = new Regex(@"<table cellspacing=""1"" cellpadding=""0"" bgcolor=""#E4E4E4"" id=""at"">(.|\n)*?</table>");
var mat_mulu = reg_mulu.Match(html);
string mulu = mat_mulu.Groups[0].ToString();
// 匹配a标签里面的url
Regex tmpreg = new Regex("<a[^>]+?href=\"([^\"]+)\"[^>]*>([^<]+)</a>", RegexOptions.Compiled);
MatchCollection sMC = tmpreg.Matches(mulu);
if (sMC.Count != 0)
{
//循环目录url，获取正文内容
for (int i = 0; i < sMC.Count; i++)
{
//sMC[i].Groups[1].Value
//0是<a href="http://www.23us.so/files/article/html/13/13655/5638725.html">第一章 泰山之巅</a>
//1是http://www.23us.so/files/article/html/13/13655/5638725.html
//2是第一章 泰山之巅
// 获取章节标题
string title = sMC[i].Groups[2].Value;
// 获取文章内容
string html_z = cra.HttpGet(sMC[i].Groups[1].Value, "");
// 获取小说名字,章节中也可以查找名字
//Match ma_name = Regex.Match(html, @"<meta name=""keywords"".+content=""(.+)"" />");
//string name = ma_name.Groups[1].Value.ToString().Split(',')[0];
// 获取标题,通过分析h1标签也可以得到章节标题
//string title = html_z.Replace("<h1>", "*").Replace("</h1>", "*").Split('*')[1];
// 获取正文
Regex reg = new Regex(@"<dd id=""contents"">(.|\n)*?</dd>");
MatchCollection mc = reg.Matches(html_z);
var mat = reg.Match(html_z);
string content = mat.Groups[0].ToString().Replace("<dd id=\"contents\">", "").Replace("</dd>", "").Replace(" ", "").Replace("<br />", "\r\n");
// txt文本输出
string path = AppDomain.CurrentDomain.BaseDirectory.Replace("\\", "/") + "Txt/";
Novel(title + "\r\n" + content, name, path);
}
}
}
/// <summary>
/// 创建文本
/// </summary>
/// <param name="content">内容</param>
/// <param name="name">名字</param>
/// <param name="path">路径</param>
public void Novel(string content, string name, string path)
{
string Log = content + "\r\n";
// 创建文件夹，如果不存在就创建file文件夹
if (Directory.Exists(path) == false)
{
Directory.CreateDirectory(path);
}
// 判断文件是否存在，不存在则创建
if (!System.IO.File.Exists(path + name + ".txt"))
{
FileStream fs1 = new FileStream(path + name + ".txt", FileMode.Create, FileAccess.Write);// 创建写入文件
StreamWriter sw = new StreamWriter(fs1);
sw.WriteLine(Log);// 开始写入值
sw.Close();
fs1.Close();
}
else
{
FileStream fs = new FileStream(path + name + ".txt" + "", FileMode.Append, FileAccess.Write);
StreamWriter sr = new StreamWriter(fs);
sr.WriteLine(Log);// 开始写入值
sr.Close();
fs.Close();
}
}
public string HttpPost(string Url, string postDataStr)
{
CookieContainer cookie = new CookieContainer();
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = Encoding.UTF8.GetByteCount(postDataStr);
request.CookieContainer = cookie;
Stream myRequestStream = request.GetRequestStream();
StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("gb2312"));
myStreamWriter.Write(postDataStr);
myStreamWriter.Close();
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
response.Cookies = cookie.GetCookies(response.ResponseUri);
Stream myResponseStream = response.GetResponseStream();
StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
string retString = myStreamReader.ReadToEnd();
myStreamReader.Close();
myResponseStream.Close();
return retString;
}
public string HttpGet(string Url, string postDataStr)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url + (postDataStr == "" ? "" : "?") + postDataStr);
request.Method = "GET";
HttpWebResponse response;
request.ContentType = "text/html;charset=UTF-8";
try
{
response = (HttpWebResponse)request.GetResponse();
}
catch (WebException ex)
{
response = (HttpWebResponse)request.GetResponse();
}
Stream myResponseStream = response.GetResponseStream();
StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
string retString = myStreamReader.ReadToEnd();
myStreamReader.Close();
myResponseStream.Close();
return retString;
}
}
}
三、最后效果
