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Golang爬虫入门:Colly框架实战教程

2025-07-11 11:57:33 0浏览 收藏

本篇文章给大家分享《Golang爬虫入门:用Colly框架实战开发》,覆盖了Golang的常见基础知识,其实一个语言的全部知识点一篇文章是不可能说完的,但希望通过这些问题,让读者对自己的掌握程度有一定的认识(B 数),从而弥补自己的不足,更好的掌握它。

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/20250711/175220623168708b970cb3c.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>今天关于《Golang爬虫入门:Colly框架实战教程》的内容就介绍到这里了,是不是学起来一目了然!想要了解更多关于的内容请关注golang学习网公众号!</p> </div> <div class="labsList"> </div> <div class="cateBox"> <div class="cateItem"> <a href="/article/257664.html" title="Semaphore如何控制并发,Java信号量原理详解" class="img_box"> 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<div class="form-group" style="height:70px;"> <input type="password" id="password2" name="password" data-rule="required;password" class="form-control" placeholder="密码必须6-30个字符"> </div> <div class="codeBox" style="height:70px;"> <div class="form-group" style="height:70px; width:205px; float: left;"> <input type="text" name="captcha" class="form-control" placeholder="验证码" data-rule="required;length(4)" /> </div> <span class="input-group-btn" style="padding:0;border:none;"> <img src="/captcha.html" width="100" height="45" onclick="this.src = '/captcha.html?r=' + Math.random();"/> </span> </div> <div class="loginBtn"> <button type="submit">注册</button> </div> </form> </div> </div> </div> <div class="beforeLoginTip">登录即同意 <a href="https://www.17golang.com/about/3.html" target="_blank" class="aBlue" title="用户协议">用户协议</a> 和 <a href="https://www.17golang.com/about/4.html" target="_blank" class="aBlue" title="隐私政策">隐私政策</a></div> </div> <!-- 重置密码 --> <div class="loginInfo passwordForget"> <div class="closeIcon" onclick="$('.popupBg').hide();"></div> <div class="returnLogin cursorPointer" onclick="$('.passwordForget').hide();$('.passwordLogin').show();">返回登录</div> <div class="passwordInfo"> <ul class="logintabs selfTabMenu"> <li class="selfTabItem">重置密码</li> </ul> <div class="selfTabContBox"> <div class="selfTabCont"> <form id="resetpwd-form" class="form-horizontal form-layer nice-validator n-default n-bootstrap form" method="POST" action="/api/user/resetpwd.html" novalidate="novalidate"> <div style="height:70px;"> <input type="text" class="form-control" id="email" name="email" value="" placeholder="输入邮箱" aria-invalid="true"> </div> <div class="codeBox" style="height:70px;"> <div class="form-group" style="height:70px; width:205px; float: left;"> <input type="text" name="captcha" class="form-control" placeholder="验证码" /> </div> <span class="input-group-btn" style="padding:0;border:none;"> <a href="javascript:;" class="btn btn-primary btn-captcha cursorPointer" style="background: #2080F8; border-radius: 4px; color: #fff; padding: 12px; position: absolute;" data-url="/api/ems/send.html" data-type="email" data-event="resetpwd">发送验证码</a> </span> </div> <input type="password" class="form-control" id="newpassword" name="newpassword" value="" placeholder="请输入6-18位密码"> <div class="loginBtn mt25"> <button type="submit">重置密码</button> </div> </form> </div> </div> </div> </div> </div> </div> <script> var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?3dc5666f6478c7bf39cd5c91e597423d"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })(); </script> <script src="/assets/js/require.js" data-main="/assets/js/require-frontend.js?v=1671101972"></script> </body> </html>