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使用Golang和goquery库如何实现一个抓取网页标题的网络爬虫

P粉602998670

P粉602998670

发布时间:2025-08-31 08:08:01

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来源于php中文网

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使用Golang和goquery库可轻松抓取网页标题。首先安装goquery依赖,然后通过net/http发起GET请求获取网页内容,再用goquery.NewDocumentFromReader解析HTML,利用doc.Find("title").Text()提取标题文本。示例代码展示了从https://www.php.cn/link/1536687004241eb9faeee0e227b58c60抓取标题的过程,并包含错误处理。为提高健壮性,建议设置HTTP客户端超时、添加User-Agent头以避免被屏蔽,同时检查响应状态码和Content-Type类型。该方法适用于小型爬虫或页面监控任务。

使用golang和goquery库如何实现一个抓取网页标题的网络爬虫

使用Golang和

goquery
库抓取网页标题非常简单。你只需要发送一个HTTP请求获取网页内容,然后用
goquery
解析HTML并提取
</pre>标签的文本即可。</p>
<h3>安装依赖</h3>
<p>首先确保你安装了<pre class="brush:php;toolbar:false;">goquery</pre>库,它依赖于<pre class="brush:php;toolbar:false;">net/html</pre>和第三方的<pre class="brush:php;toolbar:false;">casbin/parse</pre>。运行以下命令安装:</p>
<font face="Courier New"><pre class="brush:php;toolbar:false;">go get github.com/PuerkitoBio/goquery</pre></font><h3>发送HTTP请求并解析HTML</h3>
<p>Golang<a style="color:#f60; text-decoration:underline;" title="标准库" href="https://www.php.cn/zt/74427.html" target="_blank">标准库</a>中的<pre class="brush:php;toolbar:false;">net/http</pre>可以用来发起GET请求。将响应体传给<pre class="brush:php;toolbar:false;">goquery.NewDocumentFromReader</pre>,就可以用jQuery风格的选择器提取数据。</p>
<p>以下是一个完整示例,抓取指定URL的网页标题:</p>
<p><span>立即学习</span>“<a href="https://pan.quark.cn/s/00968c3c2c15" style="text-decoration: underline !important; color: blue; font-weight: bolder;" rel="nofollow" target="_blank">go语言免费学习笔记(深入)</a>”;</p>
<p><font face="Courier New"></font></p><pre class="brush:php;toolbar:false;">package main
<p>import (
"fmt"
"log"
"net/http"</p><pre class='brush:php;toolbar:false;'>"github.com/PuerkitoBio/goquery"</pre><p>)</p><div class="aritcle_card flexRow">
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<p>func fetchTitle(url string) {
// 发起HTTP GET请求
resp, err := http.Get(url)
if err != nil {
log.Printf("请求失败: %v", err)
return
}
defer resp.Body.Close()</p><pre class='brush:php;toolbar:false;'>// 确保状态码是200
if resp.StatusCode != http.StatusOK {
    log.Printf("HTTP错误: %d", resp.StatusCode)
    return
}

// 使用goquery解析响应体
doc, err := goquery.NewDocumentFromReader(resp.Body)
if err != nil {
    log.Printf("解析HTML失败: %v", err)
    return
}

// 查找title标签并获取内容
title := doc.Find("title").Text()
if title == "" {
    fmt.Println("未找到标题")
} else {
    fmt.Printf("标题: %s\n", title)
}</pre><p>}</p>
<p>func m<a style="color:#f60; text-decoration:underline;" title="ai" href="https://www.php.cn/zt/17539.html" target="_blank">ai</a>n() {
fetchTitle("<a href="https://www.php.cn/link/1536687004241eb9faeee0e227b58c60">https://www.php.cn/link/1536687004241eb9faeee0e227b58c60</a>")
}</p>
<h3>处理常见问题</h3>
<p>实际使用中可能遇到网络超时、重定向、非UTF-8编码等问题。可以优化请求客户端来增强健壮性:</p>
<ul>
<li>设置超时时间避免卡住</li>
<li>检查Content-Type确保是HTML</li>
<li>对某些网站可能需要设置User-Agent防止被屏蔽</li>
</ul>
<p><font face="Courier New"></font></p><pre class="brush:php;toolbar:false;">client := &http.Client{
    Timeout: 10 * time.Second,
}
req, _ := http.NewRequest("GET", url, nil)
req.Header.Set("User-Agent", "Mozilla/5.0 (compatible; GoCrawler/1.0)")
<p>resp, err := client.Do(req)</p></pre><p>基本上就这些。用<pre class="brush:php;toolbar:false;">goquery</pre>提取网页标题简洁高效,适合小型<a style="color:#f60; text-decoration:underline;" title="爬虫" href="https://www.php.cn/zt/19377.html" target="_blank">爬虫</a>或监控任务。</p>					</div>
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