Python实现爬虫设置 * 和伪装成浏览器的方法分享

1.python爬虫浏览器伪装

#导入urllib.request模块
import urllib.request
#设置请求头
headers=("User-Agent","Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.221 Safari/537.36 SE 2.X MetaSr 1.0")
#创建一个opener
opener=urllib.request.build_opener()
#将headers添加到opener中
opener.addheaders=[headers]
#将opener安装为全局
urllib.request.install_opener(opener)
#用urlopen打开网页
data=urllib.request.urlopen(url).read().decode('utf-8','ignore')

2.设置代理

#定义代理ip
proxy_addr="122.241.72.191:808"
#设置代理
proxy=urllib.request.ProxyHandle({'http':proxy_addr})
#创建一个opener
opener=urllib.request.build_opener(proxy,urllib.request.HTTPHandle)
#将opener安装为全局
urllib.request.install_opener(opener)
#用urlopen打开网页
data=urllib.request.urlopen(url).read().decode('utf-8','ignore')

3.同时设置用代理和模拟浏览器访问

#定义代理ip
proxy_addr="122.241.72.191:808"
#创建一个请求
req=urllib.request.Request(url)
#添加headers
req.add_header("User-Agent","Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko)
#设置代理
proxy=urllib.request.ProxyHandle("http":proxy_addr)
#创建一个opener
opener=urllib.request.build_opener(proxy,urllib.request.HTTPHandle)
#将opener安装为全局
urllib.request.install_opener(opener)
#用urlopen打开网页
data=urllib.request.urlopen(req).read().decode('utf-8','ignore')

4.在请求头中添加多个信息

import urllib.request
page_headers={"User-Agent":"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.221 Safari/537.36 SE 2.X MetaSr 1.0",
      "Host":"www.baidu.com",
      "Cookie":"xxxxxxxx"
      }
req=urllib.request.Request(url,headers=page_headers)
data=urllib.request.urlopen(req).read().decode('utf-8','ignore')

5.添加post请求参数

import urllib.request
import urllib.parse
#设置post参数
page_data=urllib.parse.urlencode([
                 ('pn',page_num),
                 ('kd',keywords)
                 ])
#设置headers
page_headers={
    'User-Agent':'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.221 Safari/537.36 SE 2.X MetaSr 1.0',
    'Connection':'keep-alive',
    'Host':'www.lagou.com',
    'Origin':'https://www.lagou.com',
    'Cookie':'JSESSIONID=ABAAABAABEEAAJA8F28C00A88DC4D771796BB5C6FFA2DDA; user_trace_token=20170715131136-d58c1f22f6434e9992fc0b35819a572b',
    'Accept':'application/json, text/javascript, */*; q=0.01',
    'Content-Type':'application/x-www-form-urlencoded; charset=UTF-8',
    'Referer':'https://www.lagou.com/jobs/list_％E6％95％B0％E6％8D％AE％E6％8C％96％E6％8E％98?labelWords=&fromSearch=true&suginput=',
    'X-Anit-Forge-Token':'None',
    'X-Requested-With':'XMLHttpRequest'
    }
#打开网页
req=urllib.request.Request(url,headers=page_headers)
data=urllib.request.urlopen(req,data=page_data.encode('utf-8')).read().decode('utf-8')

6.利用phantomjs模拟浏览器请求

#1.下载phantomjs安装到本地,并设置环境变量
from selenium import webdriver
bs=webdriver.PhantomJS()
#打开url
bs.get(url)
#获取网页源码
url_data=bs.page_source
#将浏览到的网页保存为图片
bs.get_screenshot_as_file(filename)

7.phantomjs设置user-agent和cookie

from selenium import webdriver
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
dcap = dict(DesiredCapabilities.PHANTOMJS)
dcap["phantomjs.page.settings.userAgent"] = ("Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.221 Safari/537.36 SE 2.X MetaSr 1.0")
bs = webdriver.PhantomJS(desired_capabilities=dcap)
bs.get(url)
#删除cookie
bs.delete_all_cookies()
#设置cookie
#cookie格式：在浏览器cookie中查看，一个cookie需要包含以下参数，domain、name、value、path
cookie={
 'domain':'.www.baidu.com', #注意前面有.
 'name':'xxxx',
 'value':'xxxx',
 'path':'xxxx'
 }
#向phantomjs中添加cookie
bs.add_cookie(cookie)

8.利用web_driver工具

#1.下载web_driver工具（如chromdriver.exe）及对应的浏览器
#2.将chromdriver.exe放到某个目录，如c:\chromdriver.exe
from selenium import webdriver
driver=webdriver.Chrome(executable_path="C:\chromdriver.exe")
#打开url
driver.get(url)

来源：https://blog.csdn.net/d1240673769/article/details/74295148