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Python基于分析Ajax请求实现抓取今日头条街拍图集功能示例

2018-07-19 09:24 1546 查看

本文实例讲述了Python基于分析Ajax请求实现抓取今日头条街拍图集功能。分享给大家供大家参考，具体如下：

代码:

import os
import re
import json
import time
from hashlib import md5
from multiprocessing import Pool
import requests
from requests.exceptions import RequestException
from pymongo import MongoClient
# 配置信息
OFFSET_START = 0  # 爬去页面的起始下标
OFFSET_END = 20  # 爬去页面的结束下标
KEYWORD = '街拍'  # 搜索的关键字
# mongodb相关配置
MONGO_URL = 'localhost'
MONGO_DB = 'toutiao'  # 数据库名称
MONGO_TABLE = 'jiepai' # 集合名称
# 图片保存的文件夹名称
IMAGE_PATH = 'images'
headers = {
"User-Agent": 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)'
}
client = MongoClient(host=MONGO_URL)
db = client[MONGO_DB]
jiepai_table = db[MONGO_TABLE]
if not os.path.exists(IMAGE_PATH):
os.mkdir(IMAGE_PATH)
def get_html(url, params=None):
try:
response = requests.get(url, params=params, headers=headers)
if response.status_code == 200:
return response.text
return None
except RequestException as e:
print("请求%s失败: " % url, e)
return None
# 获取索引页内容
def get_index_page(offset, keyword):
basic_url = 'http://www.toutiao.com/search_content/'
params = {
'offset': offset,
'format': 'json',
'keyword': keyword,
'autoload': 'true',
'count': 20,
'cur_tab': 3
}
return get_html(basic_url, params)
def parse_index_page(html):
'''
解析索引页内容
返回: 索引页中包含的所有详情页url
'''
if not html:
return
data = json.loads(html)
if 'data' in data:
for item in data['data']:
article_url = item['article_url']
if 'toutiao.com/group' in article_url:
yield article_url
# 获取详情页
def get_detail_page(url):
return get_html(url)
# 解析详情页
def parse_detail_page(url, html):
'''
解析详情页
返回对应的标题，url和包含的图片url
'''
title_reg = re.compile('<title>(.*?)</title>')
title = title_reg.search(html).group(1)
gallery_reg = re.compile('var gallery = (.*?);')
gallery = gallery_reg.search(html)
if gallery and 'sub_images' in gallery.group(1):
images = json.loads(gallery.group(1))['sub_images']
image_list = [image['url'] for image in images]
return {
'title': title,
'url': url,
'images': image_list
}
return None
def save_to_mongodb(content):
jiepai_table.insert(content)
print("存储到mongdob成功", content)
def download_images(image_list):
for image_url in image_list:
try:
response = requests.get(image_url)
if response.status_code == 200:
save_image(response.content)
except RequestException as e:
print("下载图片失败: ", e)
def save_image(content):
'''
对图片的二进制内容做hash，构造图片路径,以此保证图片不重复
'''
file_path = '{0}/{1}/{2}.{3}'.format(os.getcwd(),
IMAGE_PATH, md5(content).hexdigest(), 'jpg')
# 去除重复的图片
if not os.path.exists(file_path):
with open(file_path, 'wb') as f:
f.write(content)
def jiepai(offset):
html = get_index_page(offset, KEYWORD)
if html is None:
return
page_urls = list(parse_index_page(html))
# print("详情页url列表:" )
# for page_url in page_urls:
#   print(page_url)
for page in page_urls:
print('get detail page:', page)
html = get_detail_page(page)
if html is None:
continue
content = parse_detail_page(page, html)
if content:
save_to_mongodb(content)
download_images(content['images'])
time.sleep(1)
print('-------------------------------------')
if __name__ == '__main__':
offset_list = range(OFFSET_START, OFFSET_END)
pool = Pool()
pool.map(jiepai, offset_list)

备注:

其实通过url请求返回的json数据中已经包含了图片列表

import requests
basic_url = 'http://www.toutiao.com/search_content/?offset={}&format=json&keyword=%E8%A1%97%E6%8B%8D&autoload=true&count=20&cur_tab=3'
url = basic_url.format(0)
html = requests.get(url).json()
items = html['data']
for item in items:
title = item['media_name']
image_list = [image_detail['url'] for image_detail in item['image_detail']]
print(title, image_list)

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