PuppeteerSharp+AngleSharp的爬虫实战之汽车之家数据抓取

参考了DotNetSpider示例，
感觉DotNetSpider太重了，它是一个比较完整的爬虫框架。
对比了以下各种无头浏览器，最终采用PuppeteerSharp+AngleSharp写一个爬虫示例。
和上面的博文一样，都是用汽车之家的https://store.mall.autohome.com.cn/83106681.html这个页面做数据采集示例。
本文中使用PuppeteerSharp获取最终页面(即加载JavaScript之后的页面)，使用AngleSharp进行Html documents解析处理。

Headless Browsers

A list of (almost) all headless web browsers in existence

A web browser without a graphical user interface, controlled programmatically. Used for automation, testing, and other purposes.

Browser engines

These browser engines fully render web pages or run JavaScript in a virtual DOM

Name	About	Supported Languages	License
Chromium Embedded Framework	CEF is a open source project based on the Google Chromium project.	JavaScript	BSD
Erik	Headless browser on top of Kanna and WebKit.	Swift	MIT
jBrowserDriver	A Selenium-compatible headless browser which is written in pure Java. WebKit-based. Works with any of the Selenium Server bindings.	Java	Apache License v2.0
PhantomJS	[Unmaintained] PhantomJS is a headless WebKit scriptable with a JavaScript API. It has fast and native support for various web standards: DOM handling, CSS selector, JSON, Canvas, and SVG.	JavaScript, Python, Ruby, Java, C#, Haskell, Objective-C, Perl, PHP, R(via Selenium)	BSD 3-Clause
Splash	Splash is a javascript rendering service with an HTTP API. It's a lightweight browser with an HTTP API, implemented in Python using Twisted and QT.	Any	BSD 3-Clause

Multi drivers

These libraries can control multiple browser engines (typically using Selenium)

Name	About	Supported Languages	License
CasperJS	CasperJS is an open source navigation scripting & testing utility written in Javascript for the PhantomJS WebKit headless browser and SlimerJS (Gecko).	JavaScript	MIT
Geb	Geb is a Groovy interface to WebDriver.	Groovy	Apache
Selenium	Selenium is a suite of tools to automate web browsers across many platforms.	JavaScript, Python, Ruby, Java, C#, Haskell, Objective-C, Perl, PHP, R	Apache
Splinter	Splinter is an open source tool for testing web applications using Python. It lets you automate browser actions, such as visiting URLs and interacting with their items.	Python	-
SST	SST (selenium-simple-test) is a web test framework that uses Python to generate functional browser-based tests.	Python	-
Watir	The most elegant way to use Selenium WebDriver with ruby.	Ruby	MIT

PhantomJS drivers

These libraries control PhantomJS

Name	About	Supported Languages	License
Ghostbuster	Automated browser testing via phantom.js, with all of the pain taken out! That means you get a real browser, with a real DOM, and can do real testing!	JavaScript	Not specified
jedi-crawler	Lightsabing Node/PhantomJS crawler; scrape dynamic content : without the hassle	JavaScript	Not specified
Lotte	Lotte is a headless, automated testing framework built on top of PhantomJS and inspired by Ghostbuster.	JavaScript	MIT
phantompy	Phantompy is a headless WebKit engine with powerful pythonic api build on top of Qt5 Webkit	Python	LGPL-2.1
X-RAY	Supports strings, arrays, arrays of objects, nested object structures, selector API, pagination, crawler, concurrency, throttles, delays, timeouts, and pluggable drivers (PhantomJS, HTTP)	JavaScript	MIT
Horseman	Promise based Node.js module for PhantomJS. Features chainable API, understandable control-flow, support for multiple tabs, and built-in jQuery.	JavaScript	MIT

Chromium drivers

These libraries control Chromium

Name	About	Supported Languages	License
Awesomium	Chromium-based headless browser engine	C++,	Free/Commercial
Headless Chromium	Chromium feature activated with the --headlesss flag, currently availible in the nightly build of Chromium, not yet released	C++	Opensource
Puppeteer	Headless Chrome Node API from the Chrome DevTools team	JavaScript	Apache
PuppeteerSharp	PuppeteerSharp is a port of the official Headless Chrome Node.JS Puppeteer API		MIT
chrome-remote-interface	Chrome Debugging Protocol interface for Node.js	JavaScript	MIT
Chromy	Features chainable API, mobile emulation, fundamental API such as javascript evaluation.	JavaScript	MIT
chromedp	A faster, simpler way to drive browsers (Chrome, Edge, Safari, Android, etc) without external dependencies (ie, Selenium, PhantomJS, etc) using the Chrome Debugging Protocol.	Go	MIT
Chromeless	Chrome automation made simple. Runs locally or headless on AWS Lambda.	JavaScript	MIT

Webkit drivers

These drivers control an in-process instance of Webkit

Name	About	Supported Languages	License
Browserjet	Runs a custom build of webkit, controlled by node.js interface.	JavaScript	Not specified
ghost.py	ghost.py is a webkit web client written in python.	Python	MIT
headless_browser	Headless browser based on WebKit written in C++.	C++	Not Specified
Jabba-Webkit	Jabba's headless webkit browser for scraping AJAX-powered webpages.	Python	Not specified
Jasmine-Headless-Webkit	jasmine-headless-webkit uses the QtWebKit widget to run your specs without needing to render a pixel.	Python, JavaScript, Ruby	Free
Python-Webkit	Python-Webkit is a python extension to Webkit to add full, complete access to Webkit's DOM	Python	GNU
Spynner	Programmatic web browsing module with AJAX support for Python	Python	Not specified
Webloop	Scriptable, headless WebKit with a Go API.	Go	BSD 3-Clause
wkhtmltopdf wkhtmltox wkhtmltoimage	Command line tool rendering HTML into PDF and other image formats.	shell, C	LGPLv3
WKZombie	Functional headless browser (with JSON support) for iOS using WebKit and hpple/libxml2.	Swift	MIT

Other drivers

These libraries control lesser known browsers or OS-provided web libraries

Name	About	Supported Languages	License
Nightmare	Nightmare is a high-level browser automation library built as an easier alternative to PhantomJS. It runs on the Electron engine.	JavaScript	MIT
grope	A RubyCocoa interface to the macOS WebKit Framework	RubyCocoa	MIT
SlimerJS	SlimerJS is similar to PhantomJs, except that it runs Gecko, the browser engine of Mozilla Firefox, instead of Webkit (And it is not yet truly headless).	JavaScript	Mozilla 2.0
SpecterJS	A scriptable headless Internet Explorer port of PhantomJS.	JavaScript	MIT
trifleJS	A headless Internet Explorer browser using the WebBrowser Class with a Javascript API running on the V8 engine.	JavaScript	MIT

Fake Browser Engine

These libraries are typically naive or HTML-only browsers

Name	About	Supported Languages	License
AngleSharp	Http Parsing Library		MIT
Guillotine	A headless browser, written in C#		LGPL-3.0
benv	Stub a browser environment in node.js and headlessly test your client-side code.	JavaScript	MIT
browser.rb	Headless Ruby browser on top of Nokogiri and TheRubyRacer	Ruby	Not specified
BrowserKit	BrowserKit simulates the behavior of a web browser.	PHP	MIT
DamonJS	Bot navigating urls and doing tasks.	JavaScript	Apache
Headless	Headless browser support for fast web acceptance testing in		MIT
HeadlessBrowser	A very miniature headless browser, for testing the DOM on Node.js	JavaScript	Not specified
HtmlUnit	HtmlUnit is a "GUI-Less browser for Java programs".	Java	Apache
Jaunt	Java Web Scraping & Automation API	Java	Not specified
JSDom	A JavaScript implementation of the WHATWG DOM and HTML standards, for use with Node.js.	JavaScript	MIT
MechanicalSoup	A Python library for automating interaction with websites.	Python	MIT
mechanize	Stateful programmatic web browsing.	Python	BSD 3-Clause, ZPL 2.1
node-as-browser	Create a browser-like environment within Node.js	JavaScript	MIT
RoboBrowser	A simple, Pythonic library for browsing the web without a standalone web browser.	Python	BSD 3-Clause
SimpleBrowser	A flexible and intuitive web browser engine designed for automation tasks. Built on the 4 framework.		BSD 3-Clause
stanislaw	Naive, mechanize-like HTML parser/form driver.	Python	Not specified
twill	Twill is a simple language that interacts with basic HTML pages (no JavaScript support).	Python	MIT
WeasyPrint	WeasyPrint is a visual rendering engine for HTML and CSS that can export to PDF. It aims to support web standards for printing.	Python	BSD 3-Clause
WWW::Mechanize	Headless browser for Perl with many plugins and extensions, notably Test::WWW:Mechanize for testing	Perl	Perl 5
X-RAY	Supports strings, arrays, arrays of objects, nested object structures, selector API, pagination, crawler, concurrency, throttles, delays, timeouts, and pluggable drivers (PhantomJS, HTTP)	JavaScript	MIT
Xidel (Internet Tools)	An XQuery-based cli web scraper for static X/HTML pages and JSON-APIs.	FreePascal, XQuery	GPL-2
Zombie.js	Zombie.js is a lightweight framework for testing client-side JavaScript code in a simulated environment. No browser required.	JavaScript	MIT

Runs in a browser

Name	About	Supported Languages	License
DalekJS	[unmaintained and recommend TestCafé] Automated cross browser testing with JavaScript.	JavaScript	MIT
TestCafé	Automated browser testing for the modern web development stack.	JavaScript	MIT
Sahi	Sahi is a cross-browser automation/testing tool with the facility to record and playback scripts.	JavaScript, Java, Ruby, PHP	Apache / Commercial
WatiN	Web Application Testing In		Apache 2.0

Misc tools

Name	About	Supported Languages	License
browser-launcher	Detect and launch browser versions, headlessly or otherwise	JavaScript	MIT

其实如果没有JavaScripts加载数据需求，单独用AngleSharp就可以搞定了。
但涉及到JavaScripts加载数据需求的，就需要上真正的无头浏览器组件才能搞定了。
AngleSharp现在只支持简单的JavaScripts代码执行，稍微复杂点的，都不行，听说以后要完整支持JavaScripts，敬请期待吧！

Code

/*
 * This is a Puppeteer+AngleSharp crawler console app samples
 */
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using AngleSharp;
using AngleSharp.Dom;
using AngleSharp.Html.Parser;
using Newtonsoft.Json;
using PuppeteerSharp;

namespace CrawlerSamples
{
    internal class Program
    {
        private const string Url = "https://store.mall.autohome.com.cn/83106681.html";
        private const int ChromiumRevision = BrowserFetcher.DefaultRevision;

        private static async Task Main(string[] args)
        {
            //Download chromium browser revision package
            await new BrowserFetcher().DownloadAsync(ChromiumRevision);

            //Test AngleSharp
            await TestAngleSharp();

            Console.ReadKey();
        }

        private static async Task TestAngleSharp()
        {
            /*
             * Used AngleSharp loading of HTML document
             * TODO: Used WithJavaScript function need install AngleSharp.Scripting.Javascript nuget package
             * Note: that JavaScripts support is an experimental and does not support complex JavaScripts code.
             */
            //IConfiguration config = Configuration.Default.WithDefaultLoader().WithCss().WithCookies().WithJavaScript();
            //IBrowsingContext context = BrowsingContext.New(config);
            //IDocument document = await context.OpenAsync(url);

            //Used PuppeteerSharp loading of HTML document
            var htmlString = await TestPuppeteerSharp();

            /*
             * Parsing of HTML document string
             */
            var context = BrowsingContext.New(Configuration.Default);
            var parser = context.GetService<IHtmlParser>();
            var document = parser.ParseDocument(htmlString);

            //Selector carbox element list
            var carboxList = document.QuerySelectorAll("div.shop-content div.content div.list li.carbox");

            var carModelList = new List<CarModel>();
            foreach (var carbox in carboxList)
            {
                //Parsing and converting to the car model object.
                var model = CreateModelWithAngleSharp(carbox);
                carModelList.Add(model);

                //Printing to console windows
                var jsonString = JsonConvert.SerializeObject(model);
                Console.WriteLine(jsonString);
                Console.WriteLine();
            }

            Console.WriteLine("Total count:" + carModelList.Count);
        }

        private static async Task<string> TestPuppeteerSharp()
        {
            //Enabled headless option
            var launchOptions = new LaunchOptions { Headless = true };
            //Starting headless browser
            var browser = await Puppeteer.LaunchAsync(launchOptions);

            //New tab page
            var page = await browser.NewPageAsync();
            //Request URL to get the page
            await page.GoToAsync(Url);

            //Get and return the HTML content of the page
            var htmlString = await page.GetContentAsync();

            #region Dispose resources
            //Close tab page
            await page.CloseAsync();

            //Close headless browser, all pages will be closed here.
            await browser.CloseAsync();
            #endregion

            return htmlString;
        }

        private static CarModel CreateModelWithAngleSharp(IParentNode node)
        {
            var model = new CarModel
            {
                Title = node.QuerySelector("a div.carbox-title").TextContent,
                ImageUrl = node.QuerySelector("a div.carbox-carimg img").GetAttribute("src"),
                ProductUrl = node.QuerySelector("a").GetAttribute("href"),
                Tip = node.QuerySelector("a div.carbox-tip").TextContent,
                OrdersNumber = node.QuerySelector("a div.carbox-number span").TextContent
            };

            return model;
        }
    }
}

Result

Note

注意，第一次运行，这一句代码：

await new BrowserFetcher().DownloadAsync(ChromiumRevision);

会从网络上下载浏览器便捷式安装包download-Win64-536395.zip到你本地，里面解压后是一个Chromium浏览器。这里需要等待一些时间。

Source

https://github.com/VAllens/CrawlerSamples