爬虫3 html解析器 html_parser.py

#coding:utf8
import urlparse
from bs4 import BeautifulSoup
import re

__author__ = 'wang'

class HtmlParser(object):
    def parse(self, page_url, html_cont):
        if page_url is None or html_cont is None:
            return

        soup = BeautifulSoup(html_cont, 'html.parser', from_encoding = 'utf-8')
        new_urls = self._get_new_urls(page_url, soup)
        new_data = self._get_new_data(page_url, soup)
        return new_urls, new_data;

    def _get_new_urls(self, page_url, soup):
        new_urls = set()
        links = soup.find_all('a', href=re.compile(r"/view/\d+\.htm"))

        for link in links:
            new_url = link['href']
            new_full_url = urlparse.urljoin(page_url, new_url);
            new_urls.add(new_full_url)

        return new_urls

    def _get_new_data(self, page_url, soup):
        res_data = {}
        res_data['url'] = page_url
        title_node = soup.find('dd', class_='lemmaWgt-lemmaTitle-title').find("h1")
        res_data['title'] = title_node.get_text()
        summary_node = soup.find('div', class_ = 'lemma-summary')
        res_data['summary'] = summary_node.get_text()

        return res_data