新手学习C#,自己折腾弄了个简单的小说爬虫，实现了把小说内容爬下来写入txt，还只能爬指定网站。
第一次搞爬虫，涉及到了网络协议，正则表达式，弄得手忙脚乱跑起来效率还差劲，慢慢改吧。
爬的目标：http://www.166xs.com/xiaoshuo/83/83557/
一、先写HttpWebRequest把网站扒下来
这里有几个坑，大概说下：
第一个就是记得弄个代理IP爬网站，第一次忘了弄代理然后ip就被封了。。。。。
第二个就是要判断网页是否压缩，第一次没弄结果各种转码gbk utf都是乱码。后面解压就好了。
///
<summary>
///
抓取网页并转码
///
</summary>
///
<param name="url"></param>
///
<param name="post_parament"></param>
///
<returns></returns>
public
string HttpGet(string url, string post_parament)
{
string html;
HttpWebRequest Web_Request = (HttpWebRequest)WebRequest.Create(url);
Web_Request.Timeout = 30000;
Web_Request.Method = "GET";
Web_Request.UserAgent = "Mozilla/4.0";
Web_Request.Headers.Add("Accept-Encoding", "gzip, deflate");
//Web_Request.Credentials = CredentialCache.DefaultCredentials;
//设置代理属性WebProxy-------------------------------------------------
WebProxy proxy = new WebProxy("111.13.7.120", 80);
//在发起HTTP请求前将proxy赋值给HttpWebRequest的Proxy属性
Web_Request.Proxy = proxy;
HttpWebResponse Web_Response = (HttpWebResponse)Web_Request.GetResponse();
if (Web_Response.ContentEncoding.ToLower() == "gzip") // 如果使用了GZip则先解压 {
using (Stream Stream_Receive = Web_Response.GetResponseStream())
{
using (var Zip_Stream = new GZipStream(Stream_Receive, CompressionMode.Decompress))
{
using (StreamReader Stream_Reader = new StreamReader(Zip_Stream, Encoding.Default))
{
html = Stream_Reader.ReadToEnd();
}
}
}
}
else
{
using (Stream Stream_Receive = Web_Response.GetResponseStream())
{
using (StreamReader Stream_Reader = new StreamReader(Stream_Receive, Encoding.Default))
{
html = Stream_Reader.ReadToEnd();
}
}
}
return html;
}
二、下面就是用正则处理内容了，由于正则表达式不熟悉所以重复动作太多。
1.先获取网页内容
IWebHttpRepository webHttpRepository = new WebHttpRepository(); string html = webHttpRepository.HttpGet(Url_Txt.Text, "");
2.获取书名和文章列表
书名
文章列表
string Novel_Name = Regex.Match(html, @"(?<=<h1>)([Ss]*?)(?=</h1>)").Value; //获取书名
Regex Regex_Menu = new Regex(@"(?is)(?<=<dl class=""book_list"">).+?(?=</dl>)");
string Result_Menu = Regex_Menu.Match(html).Value; //获取列表内容
Regex Regex_List = new Regex(@"(?is)(?<=<dd>).+?(?=</dd>)");
var Result_List = Regex_List.Matches(Result_Menu); //获取列表集合
3.因为章节列表前面有多余的<dd>,所以要剔除
int i = 0; //计数string Menu_Content = ""; //所有章节foreach (var x in Result_List)
{
if (i < 4)
{
//前面五个都不是章节列表，所以剔除 }
else
{
Menu_Content += x.ToString();
}
i++;
}
4.然后获取<a>的href和innerHTML，然后遍历访问获得内容和章节名称并处理，然后写入txt
Regex Regex_Href = new Regex(@"(?is)<a[^>]*?href=([‘""]?)(?<url>[^‘""s>]+)1[^>]*>(?<text>(?:(?!</?ab).)*)</a>"); MatchCollection Result_Match_List = Regex_Href.Matches(Menu_Content); //获取href链接和a标签 innerHTML string Novel_Path = Directory.GetCurrentDirectory() + "\Novel\" + Novel_Name + ".txt"; //小说地址 File.Create(Novel_Path).Close(); StreamWriter Write_Content = new StreamWriter(Novel_Path); foreach (Match Result_Single in Result_Match_List) { string Url_Text = Result_Single.Groups["url"].Value; string Content_Text = Result_Single.Groups["text"].Value; string Content_Html = webHttpRepository.HttpGet(Url_Txt.Text + Url_Text, "");//获取内容页 Regex Rege_Content = new Regex(@"(?is)(?<=<p class=""Book_Text"">).+?(?=</p>)"); string Result_Content = Rege_Content.Match(Content_Html).Value; //获取文章内容 Regex Regex_Main = new Regex(@"( )(.*)"); string Rsult_Main = Regex_Main.Match(Result_Content).Value; //正文 string Screen_Content = Rsult_Main.Replace(" ", "").Replace("<br />", "rn"); Write_Content.WriteLine(Content_Text + "rn");//写入标题 Write_Content.WriteLine(Screen_Content);//写入内容 } Write_Content.Dispose(); Write_Content.Close(); MessageBox.Show(Novel_Name+".txt 创建成功！"); System.Diagnostics.Process.Start(Directory.GetCurrentDirectory() + "\Novel\");
三、小说写入成功
原文：http://www.cnblogs.com/xinyibufang/p/7615400.html
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