Golang Web Scraper

My upcoming book, Learning Go, is due out in March from O'Reilly.It is targeted at experienced developers who are curious about Go as well as those have started using Go. Learning Go teaches you how to write idiomatic Go code, is up-to-date for Go 1.16, and includes a chapter that previews Go's Generics support, coming in early 2022. You can read the complete draft on O'Reilly Learning now at. Web scrapping with Golang September 4, 2018 kaviComments 0 Comment Web scrapping is a technic to parse HTML output of website. Most of the online bots are based on same technic to get required information about particular website or page. Building a Web Scraper. As I mentioned in the introduction, we’ll be building a simple web scraper in Go. Note that I didn’t say web crawler because our scraper will only be going one level deep (maybe I’ll cover crawling in another post). A simple concurrent scraper Our scraper will basically try to download a list of web pages we’re giving him first, and check it gets a 200 HTTP status code (meaning the server returned an HTML page without an error). We can use goquery for web page scraping in GoLang. We can download the HTML and scrape useful information using goquery package in GoLang.

Golang Web Scraping Tutorial
Golang Web Scraping Xpath
Golang Web Scraper Download

Web scrapping is a technic to parse HTML output of website. Most of the online bots are based on same technic to get required information about particular website or page.

Using XML parser we can parse HTML page and get the required information. However, jquery selector are best to parse HTML page. So, in this tutorial we will be using Jquery library in Golang to parse the HTML doc.

Project Setup and dependencies

As mention above, we will be using Jquery library as a parser. So go get the library using following command

Golang Web Scraping Tutorial

Create a file webscraper.go and open it in any of your favorite text editor.

Web Scraper code to get post from website

</div><table><tbody><tr><td><div><div>2</div><div>4</div><div>6</div><div>8</div><div>10</div><div>12</div><div>14</div><div>16</div><div>18</div><div>20</div><div>22</div><div>24</div><div>26</div><div>28</div></div></td><td><div><div><span>// import standard libraries</span></div><div><span>'github.com/PuerkitoBio/goquery'</span></div><div><span>doc</span><span>,</span><span>err</span><span>:</span><span>=</span><span>goquery</span><span>.</span><span>NewDocument</span><span>(</span><span>'http://code2succeed.com'</span><span>)</span></div><div><span>log</span><span>.</span><span>Fatal</span><span>(</span><span>err</span><span>)</span></div><div><span>// use CSS selector found with the browser inspector</span></div><div><span>doc</span><span>.</span><span>Find</span><span>(</span><span>'#main article .entry-title'</span><span>)</span><span>.</span><span>Each</span><span>(</span><span>func</span><span>(</span><span>index </span><span>int</span><span>,</span><span>item *</span><span>goquery</span><span>.</span><span>Selection</span><span>)</span><span>{</span></div><div><span>linkTag</span><span>:</span><span>=</span><span>item</span><span>.</span><span>Find</span><span>(</span><span>'a'</span><span>)</span></div><div><span>fmt</span><span>.</span><span>Printf</span><span>(</span><span>'Post #%d: %s - %sn'</span><span>,</span><span>index</span><span>,</span><span>title</span><span>,</span><span>link</span><span>)</span></div><div><span>}</span></div><div><span>func</span><span>main</span><span>(</span><span>)</span><span>{</span></div><div><span>}</span></div></div></td></tr></tbody></table><h3 id='golang-web-scraping-xpath'>Golang Web Scraping Xpath</h3><h3>Output</h3><div><textarea wrap='soft' readonly='>Post #0: Getting started with ReactJs - http://www.code2succeed.com/getting-started-with-reactjs/ Post #1: Intro to React - http://www.code2succeed.com/intro-to-react/ Post #2: Caesar Decryption of string using javascript - http://www.code2succeed.com/caesar-decryption-of-string-using-javascript/ Post #3: Caesar encryption of string using JavaScript - http://www.code2succeed.com/caesar-encryption-of-string-using-javascript/

Getting started with ReactJs

-http://www.code2succeed.com/getting-started-with-reactjs/

Intro toReact

Post#2:

-http://www.code2succeed.com/caesar-decryption-of-string-using-javascript/

Caesar encryption of stringusing JavaScript

-http://www.code2succeed.com/caesar-encryption-of-string-using-javascript/

Stay tuned for more updates and tutorials !!!

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Golang Web Scraper

Project Setup and dependencies

Golang Web Scraping Tutorial

Web Scraper code to get post from website

Golang Web Scraper Download

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