import requests
from urllib.parse import urlencode
from requests import codes
import os #路径
from hashlib import md5 #摘要算法(哈希)
from multiprocessing.pool import Pool
import re
def get_page(offset): #获取网页json文本
params = {
'aid':'24',
'app_name':'web_search',
'offset': offset,
'format': 'json',
'keyword': '街拍图片',
'autoload': 'true',
'count': '20',
'en_qc': '1',
'cur_tab ': '1',
'from': 'search_tab',
'pd': 'synthesis'
}
base_url = 'https://www.toutiao.com/api/search/content/?'
url = base_url + urlencode(params)
headers={
"user-agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36",
"cookie":"tt_webid=6701616237875398148; WEATHER_CITY=%E5%8C%97%E4%BA%AC; UM_distinctid=16b4b9bc9e970e-02765bc3432b43-e353165-144000-16b4b9bc9ea5ac; tt_webid=6701616237875398148; csrftoken=22502c1f2bb590feb6bd44fd012c9aad; s_v_web_id=21f69859b89c3a163ebef7cba7ba3a4e; __tasessionId=8sspmcj7l1561426743570; CNZZDATA1259612802=551418336-1560339887-%7C1561425289",
"x-requested-with":"XMLHttpRequest",
"referer":"https://www.toutiao.com/search/?keyword=%E8%A1%97%E6%8B%8D%E5%9B%BE%E7%89%87"
}
try:
response = requests.get(url=url,headers=headers)
if 200 == response.status_code:
return response.json()
except requests.ConnectionError:
return None
def get_images(json): #获取图片来源
if json.get("data"):
data = json.get("data")
for item in data:
if item.get('title') is None: #如果x不是空的时候
continue
title = item.get('title')
images = item.get('image_list')
for image in images:
#origin_image = re.sub("list", "origin", image.get('url'))
origin_image = re.sub("list.*?pgc-image", "large/pgc-image", image.get('url')) #字符串的替换第一个参数是要被替换的部分,第二个参数是将要替换的东西,第三个参数是要替换的字符串
yield {
'image': origin_image,
#'iamge': image.get('url'),
'title': title
}
def save_image(item): #图片写入
img_path = 'img' + os.path.sep + item.get('title') #os.path.sep是‘\’
if not os.path.exists(img_path): #判断括号里的文件是否存在
os.makedirs(img_path) #创建目录
try:
resp = requests.get(item.get('image'))
if codes.ok == resp.status_code:
file_path = img_path + os.path.sep + '{file_name}.{file_suffix}'.format(
file_name=md5(resp.content).hexdigest(), #文本类型用text(返回Unicode型的数据),图片、文件类型用contexnt(返回二进制)
file_suffix='jpg') #hexdigest()返回摘要,作为十六进制数据字符串值,md5会随机生成一串十六进制字符串
if not os.path.exists(file_path): #如果不存在,写入,存在就不写入
with open(file_path, 'wb') as f:
f.write(resp.content)
print('Downloaded image path is %s' % file_path)
else:
print('Already Downloaded', file_path)
except requests.ConnectionError:
print('Failed to Save Image,item %s' % item)
def main(offset):
json = get_page(offset)
for item in get_images(json):
save_image(item)
GROUP_START = 0
GROUP_END = 20
if __name__ == '__main__':
pool = Pool() #pool=Pool(5)创建拥有5个进程数量的进程池,默认计算机能力范围
groups = ([x * 20 for x in range(GROUP_START, GROUP_END + 1)]) #列表解析
pool.map(main, groups)
pool.close() #关闭进程池,不再接受新的进程
pool.join() #主进程阻塞等待子进程的退出
今日头条街拍图片爬虫
最新推荐文章于 2021-09-05 15:46:09 发布