毕设二:python 爬取京东的商品评论

  1 # -*- coding: utf-8 -*-
  2 # @author: Tele
  3 # @Time  : 2019/04/14 下午 3:48
  4 # 多线程版
  5 import time
  6 import requests
  7 import os
  8 import json
  9 from fake_useragent import UserAgent
 10 from lxml import etree
 11 import threading
 12 from concurrent.futures import ThreadPoolExecutor, wait, as_completed
 13 
 14 
 15 class JDSplier:
 16     executor = ThreadPoolExecutor(max_workers=6)
 17     mutex = threading.Lock()
 18     flag = True
 19 
 20     @staticmethod
 21     def get_proxy():
 22         return requests.get("http://127.0.0.1:5010/get/").content.decode()
 23 
 24     @staticmethod
 25     def get_ua():
 26         ua = UserAgent()
 27         return ua.random
 28 
 29     def __init__(self, kw_list):
 30         self.kw_list = kw_list
 31         # 评论url
 32         self.url_temp = "https://sclub.jd.com/comment/productPageComments.action?&productId={}&score=0&sortType=5&page={}&pageSize=10&isShadowSku=0&rid=0&fold=1"
 33         self.headers = {
 34             "User-Agent": "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36",
 35 
 36         }
 37         self.proxies = {
 38             "http": None
 39         }
 40         self.parent_dir = None
 41         self.file_dir = None
 42 
 43     # ua,proxy
 44     def check(self):
 45         self.headers["User-Agent"] = JDSplier.get_ua()
 46         proxy = "http://" + JDSplier.get_proxy()
 47         self.proxies["http"] = proxy
 48         print("ua:", self.headers["User-Agent"])
 49         print("proxy:", self.proxies["http"])
 50 
 51     # 评论
 52     def parse_url(self, product_id, page):
 53         url = self.url_temp.format(product_id, page)
 54         response = requests.get(url, headers=self.headers, proxies=self.proxies, verify=False)
 55         if response.status_code == 200:
 56             print(url)
 57             data = None
 58             if len(response.content) < 0:
 59                 return
 60             # 很奇葩
 61             try:
 62                 data = json.loads(response.content.decode("gbk"))
 63             except:
 64                 data = json.loads(response.content.decode())
 65             finally:
 66                 # 评论
 67                 if not data:
 68                     return
 69                 comment_list = data["comments"]
 70                 if len(comment_list) > 0:
 71                     item_list = list()
 72                     for comment in comment_list:
 73                         item = dict()
 74                         # 商品名
 75                         item["referenceName"] = comment["referenceName"]
 76                         # 评论时间
 77                         item["creationTime"] = comment["creationTime"]
 78                         # 内容
 79                         item["content"] = comment["content"]
 80                         item_list.append(item)
 81 
 82                     # 保存
 83                     with open(self.file_dir, "a", encoding="utf-8") as file:
 84                         file.write(json.dumps(item_list, ensure_ascii=False, indent=2))
 85                         file.write("\n")
 86                     time.sleep(5)
 87                 else:
 88                     JDSplier.flag = False
 89         else:
 90             print("请求失败!")
 91 
 92     # 提取id
 93     def get_product_info(self):
 94         url_temp = "https://search.jd.com/Search?keyword={}&enc=utf-8"
 95         result_list = list()
 96         for kw in self.kw_list:
 97             url = url_temp.format(kw)
 98             response = requests.get(url, headers=self.headers, proxies=self.proxies, verify=False)
 99             if response.status_code == 200:
100                 item_dict = dict()
101                 id_list = list()
102                 html_element = etree.HTML(response.content)
103                 # 获得该关键词下第一页的商品id,前10个
104                 id_list = html_element.xpath("//div[@id='J_goodsList']/ul/li[position()<11]/@data-sku")
105                 item_dict["title"] = kw
106                 item_dict["id_list"] = id_list
107                 result_list.append(item_dict)
108             else:
109                 pass
110         return result_list
111 
112     def get_comment(self, item_list):
113         if len(item_list) > 0:
114             for item in item_list:
115                 id_list = item["id_list"]
116                 item_title = item["title"]
117                 if len(id_list) > 0:
118                     # 检查目录
119                     self.parent_dir = "f:/jd_comment/" + item_title + time.strftime("-%Y-%m-%d-%H-%M-%S",
120                                                                                     time.localtime(time.time()))
121                     if not os.path.exists(self.parent_dir):
122                         os.makedirs(self.parent_dir)
123                     task_list = list()
124                     # 每个商品开启一个线程爬取评论
125                     for product_id in id_list:
126                         t = JDSplier.executor.submit(self.job, product_id)
127                         time.sleep(10)
128                         task_list.append(t)
129                     for re in as_completed(task_list):
130                         re.result(timeout=500)
131                         # wait(task_list, timeout=500)
132                 else:
133                     print("---error,empty id list---")
134         else:
135             print("---error,empty item list---")
136 
137     def job(self, product_id):
138         self.check()
139         JDSplier.mutex.acquire()
140         page = 0
141         self.file_dir = self.parent_dir + "/" + str(product_id) + "_ratecontent.txt"
142         # 爬取评论
143         while JDSplier.flag:
144             self.parse_url(product_id, page)
145             page += 1
146         JDSplier.flag = True
147         JDSplier.mutex.release()
148 
149     def run(self):
150         # self.check()
151         item_list = self.get_product_info()
152         print(item_list)
153         self.get_comment(item_list)
154         JDSplier.executor.shutdown()
155 
156 
157 def main():
158     # "华为p30pro", "华为mate20pro",
159     # "vivoz3""oppok1","荣耀8x", "小米9", "小米mix3", "三星s9", "iphonexr", "iphonexs"
160     kw_list = ["vivoz3"]
161     splider = JDSplier(kw_list)
162     splider.run()
163 
164 
165 if __name__ == '__main__':
166     main()

ps:能多睡就多睡会,虽然很慢,但不会触发jd的安全系统,爬这种电商平台还是他们的活动日时比较好爬,那个时候为了应对超高的访问量,一般会暂时关闭反爬机制

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转载自www.cnblogs.com/tele-share/p/10719955.html
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