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Golang爬虫教程:Colly框架实战指南

2025-07-25 13:05:33 0浏览 收藏

小伙伴们有没有觉得学习Golang很有意思?有意思就对了!今天就给大家带来《Golang爬虫入门:使用Colly框架实战教程》,以下内容将会涉及到,若是在学习中对其中部分知识点有疑问,或许看了本文就能帮到你!

用Golang写爬虫不难,尤其使用colly框架时上手快。1. 安装colly并创建基础爬虫:执行go get github.com/gocolly/colly/v2,编写代码创建collector实例、设置回调函数、访问目标URL提取页面标题;2. 抓取列表页中的链接:通过c.OnHTML配合CSS选择器如.post-list a[href]提取详情链接,并可复用collector访问这些链接;3. 存储抓取数据:定义结构体如Article保存标题和URL,将结果存入变量后续导出为JSON或数据库;4. 防止重复抓取可通过WithDomain限制域名,设置User-Agent避免被屏蔽,控制并发和延迟提升大规模抓取效率,动态内容需结合chromedp等工具处理。掌握这些要点即可快速入门colly爬虫开发。

如何用Golang开发简易爬虫程序 使用colly框架入门实战

用Golang写爬虫其实不难,尤其当你使用colly这个框架时,上手非常快。Colly是Go语言中最受欢迎的爬虫库之一,结构清晰、性能好,适合做数据抓取类的小项目。如果你刚接触Go和网络爬虫,这篇文章可以帮你快速入门。

如何用Golang开发简易爬虫程序 使用colly框架入门实战

安装Colly并创建一个基础爬虫

首先你得确保Go环境已经配好,然后安装colly:

如何用Golang开发简易爬虫程序 使用colly框架入门实战
go get github.com/gocolly/colly/v2

接下来是最简单的例子:访问一个网页并打印页面标题。

package main

import (
    "fmt"
    "github.com/gocolly/colly/v2"
)

func main() {
    // 创建一个新的Collector实例
    c := colly.NewCollector()

    // 在每次抓取页面时触发
    c.OnHTML("html", func(e *colly.HTMLElement) {
        title := e.ChildText("title")
        fmt.Println("页面标题是:", title)
    })

    // 开始请求目标URL
    c.Visit("https://example.com")
}

这段代码会访问example.com,提取它的</code>标签内容并输出。看起来简单,但已经包含了colly的基本结构:创建collector → 设置回调函数 → 发起请求。</p><img src="/uploads/20250725/1753419911688310875eff9.jpg" alt="如何用Golang开发简易爬虫程序 使用colly框架入门实战"><hr><h3>抓取列表页中的链接</h3><p>实际开发中,我们经常需要从一个列表页里抓取多个条目的详情链接。比如新闻网站的首页,每条新闻都是一个链接。</p><p>假设你想抓取某个博客首页的所有文章链接,可以这样做:</p><pre>c.OnHTML(".post-list a[href]", func(e *colly.HTMLElement) { link := e.Attr("href") fmt.Println("发现文章链接:", link) })</pre><p>这里的关键点在于选择器要准确,<code>.post-list a[href]</code>表示在class为<code>post-list</code>的容器内找所有带<code>href</code>属性的<code>a</code>标签。你可以根据实际页面结构调整选择器。</p><p>如果想进一步访问这些链接,可以用另一个collector去处理详情页,或者复用当前collector,加上限制域名等设置。</p><hr><h3>存储抓取到的数据</h3><p>光打印出来不够实用,一般我们会把数据保存下来,比如JSON文件或数据库。</p><p>最简单的做法是定义一个结构体,把抓取结果存进去:</p><pre>type Article struct { Title string URL string } var articles []Article c.OnHTML(".post-list a[href]", func(e *colly.HTMLElement) { link := e.Attr("href") title := e.Text articles = append(articles, Article{ Title: title, URL: link, }) })</pre><p>之后你可以把这些数据导出成JSON,或者插入到SQLite、MySQL这样的数据库里。这部分就不展开讲了,重点还是放在爬虫本身逻辑上。</p><hr><h3>一些常见问题和建议</h3><ul><li><p><strong>防止重复抓取</strong>:可以用<code>colly.WithDomain("example.com")</code>限制域名,避免进入无关页面。</p></li><li><p><strong>设置User-Agent</strong>:有些网站会屏蔽默认的Go User-Agent,可以在初始化collector后加上:</p><pre>c.UserAgent = "Mozilla/5.0 (compatible; ExampleBot/1.0; +http://example.com/bot)"</pre></li><li><p><strong>控制并发和限速</strong>:对于大规模抓取,可以设置最大并发数和延迟:</p><pre>c.Limit(&colly.LimitRule{DomainGlob: "*", Parallelism: 2, Delay: 1 * time.Second})</pre></li><li><p><strong>处理JavaScript渲染页面</strong>:Colly本身只能抓静态HTML,无法执行JS。如果目标页面是动态加载的内容,就得考虑用其他工具配合,比如chromedp或selenium。</p></li></ul><hr><p>基本上就这些。用colly写个简易爬虫并不复杂,关键是熟悉HTML结构和CSS选择器的写法。多练几个小项目,就能掌握常见的抓取套路了。</p><p>终于介绍完啦!小伙伴们,这篇关于《Golang爬虫教程:Colly框架实战指南》的介绍应该让你收获多多了吧!欢迎大家收藏或分享给更多需要学习的朋友吧~golang学习网公众号也会发布Golang相关知识,快来关注吧!</p> </div> <div class="labsList"> </div> <div class="cateBox"> <div class="cateItem"> <a href="/article/266048.html" 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