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爬虫_拉勾网(selenium)

使用selenium进行翻页获取职位链接，再对链接进行解析

会爬取到部分空列表，感觉是网速太慢了，加了time.sleep()还是会有空列表

 1 from selenium import webdriver
 2 import requests
 3 import re
 4 from lxml import etree
 5 import time
 6 from selenium.webdriver.support.ui import WebDriverWait
 7 from selenium.webdriver.support import expected_conditions as EC
 8 from selenium.webdriver.common.by import By
 9 
10 
11 class LagouSpider(object):
12     def __init__(self):
13         opt = webdriver.ChromeOptions()
14         # 把chrome设置成无界面模式
15         opt.set_headless()
16         self.driver = webdriver.Chrome(options=opt)
17         self.url = 'https://www.lagou.com/jobs/list_爬虫?px=default&city=北京'
18         self.headers = {
19             'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.75 Safari/537.36'
20         }
21 
22 
23     def run(self):
24         self.driver.get(self.url)
25         while True:
26             html = ''
27             links = []
28             html = self.driver.page_source
29             links = self.get_one_page_links(html)
30             for link in links:
31                 print('\n' + link+'\n')
32                 self.parse_detail_page(link)
33             
34             WebDriverWait(self.driver, 10).until(
35                 EC.presence_of_element_located((By.CLASS_NAME, 'pager_next')))
36             next_page_btn = self.driver.find_element_by_class_name('pager_next')
37 
38             if 'pager_next_disabled' in next_page_btn.get_attribute('class'):
39                 break
40             else:
41                 next_page_btn.click()
42             time.sleep(1)
43  
44 
45     def get_one_page_links(self, html):
46         links = []
47         hrefs = self.driver.find_elements_by_xpath('//a[@class="position_link"]')
48         for href in hrefs:
49             links.append(href.get_attribute('href'))
50         return links
51 
52 
53     def parse_detail_page(self, url):
54         job_information = {}
55         response = requests.get(url, headers=self.headers)
56 
57         time.sleep(2)
58         html = response.text
59         html_element = etree.HTML(html)
60         job_name = html_element.xpath('//div[@class="job-name"]/@title')
61         job_description = html_element.xpath('//dd[@class="job_bt"]//p//text()')
62         for index, i in enumerate(job_description):
63             job_description[index] = re.sub('\xa0', '', i)
64         job_address = html_element.xpath('//div[@class="work_addr"]/a/text()')
65         job_salary = html_element.xpath('//span[@class="salary"]/text()')
66         
67         # 字符串处理去掉不必要的信息
68         for index, i in enumerate(job_address):
69             job_address[index] = re.sub('查看地图', '', i)
70         while '' in job_address:
71             job_address.remove('')
72 
73         job_information['job_name'] = job_name
74         job_information['job_description'] = job_description
75         job_information['job_address'] = job_address
76         job_information['job_salary'] = job_salary
77         print(job_information)
78 
79 
80 def main():
81     spider = LagouSpider()
82     spider.run()
83 
84 
85 if __name__ == '__main__':
86     main()

运行结果

 

posted @ 2018-08-13 10:38  MARK+  阅读(220)  评论(0)  编辑  收藏  举报