爬取前尘无忧python职位信息

Posted 2020-12-25 Ray_chen

１．re实现

 1 import re,os
 2 import requests
 3 from requests.exceptions import RequestException
 4 
 5 MAX_PAGE = 10 #最大页数
 6 KEYWORD = ‘python‘
 7 headers = {
 8     ‘User-Agent‘:
 9         ‘Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36‘
10 }
11 file_name = ‘re_job51_python.txt‘
12 
13 # 获取网页源码
14 def getHtml(page):
15     try:
16         url = ‘https://search.51job.com/list/040000,000000,0000,00,9,99,{0},2,{1}.html?‘.format(KEYWORD,page)
17         response = requests.get(url,headers=headers)
18         response.encoding = response.apparent_encoding
19         return response.text
20     except RequestException:
21         print(‘请求出错‘)
22         return None
23 
24 # 解析网页源码，得到目标信息
25 def getTarget(html):
26     reg = re.compile(
27         r‘class="t1 ">.*? <a target="_blank" ‘
28         ‘title="(.*?)".*? <span class="t2"><a target="_blank" ‘
29         ‘title="(.*?)".*?<span ‘
30         ‘class="t3">(.*?)</span>.*?<span ‘
31         ‘class="t4">(.*?)</span>.*? <span ‘
32         ‘class="t5">(.*?)</span>‘,
33         re.S)  # 匹配换行符
34     target = re.findall(reg,html)
35     return target
36 
37 
38 # 保存到文本中
39 def save_to_txt(item):
40     with open(file_name,‘a‘,newline=‘‘) as f:  # newline参数防止两行之间有空行
41         for i in range(len(item)):
42             # 最后一个元素换行，非最后则以＇,‘隔开
43             if i == len(item)-1:
44                 f.write(item[i])
45                 f.write(‘
‘)
46             else:
47                 f.write(item[i]+‘,‘)
48 
49 def main():
50     # 每次执行前检查文件是否存在，存在则删除
51     if os.path.exists(file_name):
52         os.remove(file_name)
53 
54     # 分页爬取
55     for page in range(MAX_PAGE+1):
56         html = getHtml(page)
57         content = getTarget(html)
58         for item in content:
59             save_to_txt(item)
60 
61 if __name__ == ‘__main__‘:
62     main()

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 ２．xpath实现

  1 import os
  2 import requests
  3 from requests.exceptions import RequestException
  4 from lxml import etree
  5 import pymongo
  6 from spiders.前程无忧.mongo_config import *
  7 
  8 # mongo数据库设置
  9 client = pymongo.MongoClient(MONGO_URL)
 10 db = client[MONGO_DB]
 11 
 12 MAX_PAGE = 5
 13 KEYWORD = ‘python‘
 14 headers = {
 15     ‘User-Agent‘:‘Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) ‘ 16     ‘Chrome/63.0.3239.132 Safari/537.36‘
 17 }
 18 file_name = ‘xpath_job51_python.txt‘
 19 
 20 # 获取网页
 21 def get_html(page):
 22     try:
 23         url = ‘https://search.51job.com/list/040000,000000,0000,00,9,99,{},2,{}.html?‘.format(KEYWORD,page)
 24         response = requests.get(url,headers=headers)
 25         response.encoding = response.apparent_encoding
 26         return response.text
 27     except RequestException:
 28         return None
 29 
 30 # 解析网页
 31 def parse_html(html):
 32     # 构造xpath解析对象，可自动修整HTML文本
 33     html = etree.HTML(html)
 34     # 获取文本 /text()
 35     # 获取属性　／@href
 36     # 获取第i个标签　／tar_name[i]  从1开始
 37     # normalize-space－－＞去空格换行符
 38     # position_name = html.xpath(‘normalize-space(//div[@class="el"]/p/span/a/text())‘)
 39 
 40     # 职位名称，
 41     position_names = []
 42     for name in html.xpath(‘//div[@class="el"]/p/span/a/text()‘):
 43         position_name = name.strip()
 44         position_names.append(position_name)
 45 
 46     # 职位地址
 47     position_urls = html.xpath(‘//div[@class="el"]/p/span/a/@href‘)
 48 
 49     # 公司名称
 50     company_names = html.xpath(‘//div[@class="el"]/span[1]/a/text()‘)
 51 
 52     # 公司地址
 53     company_urls = html.xpath(‘//div[@class="el"]/span[1]/a/@href‘)
 54 
 55     # 位置
 56     locations = html.xpath(‘//div[@class="el"]/span[@class="t3"]/text()‘)
 57 
 58     # 薪资
 59     salarys = html.xpath(‘//div[@class="el"]/span[@class="t4"]/text()‘)
 60 
 61     # 发布时间
 62     release_dates = html.xpath(‘//div[@class="el"]/span[4]/text()‘)
 63 
 64     result = zip(position_names,position_urls,company_names,company_urls,locations,salarys,release_dates)
 65     return result
 66 
 67 
 68 def save_to_txt(element):
 69     with open(file_name,‘a‘,newline=‘‘) as f:
 70         for i in range(len(element)):
 71             # data = ‘,‘.join(element[i])
 72             if i == len(element)-1:
 73                 f.write(element[i])
 74                 f.write(‘
‘)
 75             else:
 76                 f.write(element[i]+‘,‘)
 77 
 78 
 79 def save_to_mongo(element):
 80     keys = [‘position_name‘,‘position_url‘,‘company_name‘,
 81             ‘company_url‘,‘location‘,‘salary‘,‘release_date‘]
 82     result = dict(zip(keys,list(element)))
 83     if db[MONGO_TABLE_XPATH].insert(result):
 84         print(‘数据成功存储到mongo数据库中‘)
 85         return True
 86     return False
 87 
 88     # 遍历字典元素
 89     # for k,v in result.items():
 90     #     print(k,‘:‘,v)
 91     for key in result:
 92         print(key,‘:‘,result[key])
 93 
 94 
 95 
 96 def main():
 97     if os.path.exists(file_name):
 98         os.remove(file_name)
 99     for page in range(1,MAX_PAGE+1):
100         html = get_html(page)
101         elements = parse_html(html)
102         if elements:
103             for element in elements:
104                 save_to_txt(element)
105                 save_to_mongo(element)
106 
107 if __name__ == ‘__main__‘:
108     main()

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