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【爬虫】Firecrawl对京东热卖网信息爬取(仅供学习)

项目地址

GitHub - mendableai/firecrawl: 🔥 Turn entire websites into LLM-ready markdown or structured data. Scrape, crawl and extract with a single API.

Firecrawl更多是使用在LLM大模型知识库的构建,是大模型数据准备中的一环(在Dify中会接触到)也是作为检索增强生成(Retrieval Augmented Generation)技术,简称 RAG(当前最火热的LLM应用方案)的一环。

在线体验

https://www.firecrawl.dev/

邮箱或其他方式登录后,点击Dashboard

然后可见自己的API Key

分析

1.用Firecrawl的Python SDK举例

使用方法:

1.通过官网进入获取自己的API Key(免费可用500次请求)

2.打开firecrawl中的Python SDK文件夹


可在里面构建.py用于测试的文件(部分test_开头的文件是博主自行构建用于测试的
 

2.分析搜索地址(请勿大批量爬取影响网站正常运作)

https://re.jd.com/search?keyword=CCD&enc=utf-8

我们可以看到不同关键词搜索会改变地址栏的keyword=CCD,那么我们就可以通过更改地址栏keyword=来更改网络页面。(可以在在线体验中先测试一下)
简单用代码表示如下

    keyword = "Dangerous people"
    try:
        # Crawl a website:
        crawl_status = app.crawl_url(
            # 京东
            f'https://re.jd.com/search?keyword={keyword}&enc=utf-8',
            params={
                'limit': 10,
                'scrapeOptions': {'formats': ['markdown', 'html']}
            },
        )

3.完整爬虫代码

配置好环境,更换自己的API Key和关键词keyword即可

from firecrawl import FirecrawlApp
import json
import urllib.parse
import re
from bs4 import BeautifulSoup


def get_value_in_html(text):
    """html取值,通过BeautifulSoup取对应的值"""
    soup = BeautifulSoup(text, 'html.parser')
    items = soup.find_all('li', {'clstag': lambda x: x and 'ri_same_recommend' in x})

    result = []
    for item in items:
        # 取img_k类的img标签的src属性作为图片链接
        pic_img = item.find('div', class_='pic').find('img', class_='img_k')['src']
        pic_img = f"https:{pic_img}"
        a_tag = item.find('div', class_='li_cen_bot').find('a')
        if a_tag is None:
            continue
        product_link = a_tag['href']
        price = a_tag.find('div', class_='commodity_info').find('span', class_='price')
        if price is not None:
            price = price.text.strip()
        else:
            price = ''
        title = a_tag.find('div', class_='commodity_tit')
        if title is not None:
            title = title.text.strip()
        else:
            title = ''
        comment_span = a_tag.find('div', class_='comment').find('span', class_='praise')
        if comment_span is not None:
            evaluation = comment_span.text.strip()
        else:
            evaluation = ''

        product_info = {
            'price': price,
            'title': title,
            'evaluation': evaluation
        }

        result.append({
            "pic_img": pic_img,
            "product_link": product_link,
            "product_info": product_info
        })

    return result


API_KEY = "..."
# 用登录后自己的API_KEY
app = FirecrawlApp(api_key=API_KEY)


if __name__ == '__main__':
    # 可更改关键词搜索其他
    keyword = "Dangerous people"
    # keyword_encode = urllib.parse.quote(keyword)
    try:
        # Crawl a website:
        crawl_status = app.crawl_url(
            # 京东热卖
            f'https://re.jd.com/search?keyword={keyword}&enc=utf-8',
            params={
                'limit': 10,
                'scrapeOptions': {'formats': ['markdown', 'html']}
            },
        )
        # markdown = crawl_status['data'][0]['markdown']
        # 使用html提取(提取方法用到bs4)
        html = crawl_status['data'][0]['html']

        response = {
            "result_list": get_value_in_html(html)
        }
        print(json.dumps(response, ensure_ascii=False))

    except Exception as e:
        print(f"链接firecrawl异常:{e}")

4.返回爬取数据

返回json数据如下

;