Python实现爬虫从网络上下载文档的实例代码

时间:2021-05-22

最近在学习Python,自然接触到了爬虫,写了一个小型爬虫软件,从初始Url解析网页,使用正则获取待爬取链接,使用beautifulsoup解析获取文本,使用自己写的输出器可以将文本输出保存,具体代码如下:

Spider_main.py

# coding:utf8from baike_spider import url_manager, html_downloader, html_parser, html_outputerclass SpiderMain(object): def __init__(self): self.urls = url_manager.UrlManager() self.downloader = html_downloader.HtmlDownloader() self.parser = html_parser.HtmlParser() self.outputer = html_outputer.HtmlOutputer() def craw(self, root_url): count = 1 self.urls.add_new_url(root_url) while self.urls.has_new_url(): print("self.urls.has %s" % self.urls.new_urls) try: new_url = self.urls.get_new_url() print("craw %d : %s"%(count, new_url)) html_cont = self.downloader.download(new_url) new_urls, new_data = self.parser.parse(new_url, html_cont) self.urls.add_new_urls(new_urls) self.outputer.collect_data(new_data) if count == 1000: break count = count + 1 except: print("craw failed") self.outputer.output_html() self.outputer.output_txt()if __name__ == '__main__': root_url = "http://pile(r"/jiangnan/")) print(links) for link in links: new_url = link['href'] new_full_url = urllib.parse.urljoin(page_url, new_url) new_urls.add(new_full_url) # print(new_full_url) return new_urls

html_downloader.py

import urllib.requestclass HtmlDownloader(object): def download(self, url): if url is None: return None response = urllib.request.urlopen(url) if response.getcode() != 200: return None return response.read()

html_outputer.py

class HtmlOutputer(object): def __init__(self): self.datas = [] def collect_data(self, data): if data is None: return self.datas.append(data) def output_txt(self): fout = open('output.txt', 'w', encoding='utf-8') for data in self.datas: fout.write('%s \n' % data['title']) fout.write('%s \n' % data['summary']) def output_html(self): fout = open('output.html', 'w', encoding='utf-8') fout.write('<html>') fout.write('<body>') fout.write('<table>') for data in self.datas: fout.write('<tr>') fout.write('<td>%s</td>' % data['url']) fout.write('<td>%s</td>' % data['title']) fout.write('<td>%s</td>' % data['summary']) fout.write('</tr>') fout.write('</table>') fout.write('</body>') fout.write('</html>') fout.close()

总结

以上所述是小编给大家介绍的Python实现爬虫从网络上下载文档的实例代码,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对网站的支持!

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