下载中间件--随机IP代理以及随机User_Agent

下载中间件随机IP代理以及随机User_Agent

1.在settings.py中设置开启代理功能

# 设置下载中间件
DOWNLOADER_MIDDLEWARES = {
# 随机的 User-Agent
'douban.middlewares.DoubanUserAgent': 100,
# 随机的 Proxy
'douban.middlewares.DoubanProxy': 200,
} # 代理列表值
# User_Agent 列表
User_Agent_lists = [
'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.87 Safari/537.36 OPR/37.0.2178.32',
'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0',
'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/534.57.2 (KHTML, like Gecko) Version/5.1.7 Safari/534.57.2',
'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36',
'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2486.0 Safari/537.36 Edge/13.10586',
'Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko',
'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 BIDUBrowser/8.3 Safari/537.36',
'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.80 Safari/537.36 Core/1.47.277.400 QQBrowser/9.4.7658.400',
'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.116 UBrowser/5.6.12150.8 Safari/537.36',
'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.122 Safari/537.36 SE 2.X MetaSr 1.0',
'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.154 Safari/537.36 LBBROWSER',
'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.116 Safari/537.36 TheWorld 7',
'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.146 Safari/537.36',
] # 代理列表
PROXIES = [
{"ip_port": "210.16.189.75:888", "user_passwd": "fa319:fa319"},
# ... ...
# {"ip_prot": "ip:端口", "user_passwd": ""}, # 没有用户名密码的,直接将用户密码留空即可
] # 注释之前设置的 User-Agent
# DEFAULT_REQUEST_HEADERS = {
# 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
# # 'Accept-Language': 'en',
# 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.146 Safari/537.36',
# }

2.编辑middlewares.py 中间件文件

import random
import base64
from scrapy import signals
from .settings import User_Agent_lists
from .settings import PROXIES class DoubanUserAgent(object):
# process_request必要方法
def process_request(self, request, spider):
# 从列表中随机拿取一个 User_Agent 设置为头
useragent = random.choice(User_Agent_lists) # 将随机 User_Agent 放入请求中
request.headers.setdefault("User-Agent", useragent) class DoubanProxy(object):
# process_request必要方法
def process_request(self, request, spider):
proxy = random.choice(PROXIES) if proxy['user_passwd'] is None:
# 代理需要写在 request 的 meta 信息中
request.meta["proxy"] = "http://" + proxy['ip_port']
else:
# 对账户进行 base64 的编码转换
base64_userpasswd = base64.b64encode(proxy["user_passwd"].encode("utf-8")).decode() # 代理的 IP 地址
request.meta["proxy"] = "http://" + proxy['ip_port'] # 代理的 用户名密码
request.headers["Proxy-Authorization"] = 'Basic ' + base64_userpasswd
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