Python實現爬蟲設置代理IP和偽裝成瀏覽器的方法分享
1.python爬蟲瀏覽器偽裝
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#導入urllib.request模塊
import urllib.request
#設置請求頭
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")
#創建一個opener
opener=urllib.request.build_opener()
#將headers添加到opener中
opener.addheaders=[headers]
#將opener安裝為全局
urllib.request.install_opener(opener)
#用urlopen打開網頁
data=urllib.request.urlopen(url).read().decode('utf-8','ignore')
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2.設置代理
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#定義代理ip
proxy_addr="122.241.72.191:808"
#設置代理
proxy=urllib.request.ProxyHandle({'http':proxy_addr})
#創建一個opener
opener=urllib.request.build_opener(proxy,urllib.request.HTTPHandle)
#將opener安裝為全局
urllib.request.install_opener(opener)
#用urlopen打開網頁
data=urllib.request.urlopen(url).read().decode('utf-8','ignore')
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3.同時設置用代理和模擬瀏覽器訪問
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#定義代理ip
proxy_addr="122.241.72.191:808"
#創建一個請求
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)
#設置代理
proxy=urllib.request.ProxyHandle("http":proxy_addr)
#創建一個opener
opener=urllib.request.build_opener(proxy,urllib.request.HTTPHandle)
#將opener安裝為全局
urllib.request.install_opener(opener)
#用urlopen打開網頁
data=urllib.request.urlopen(req).read().decode('utf-8','ignore')
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4.在請求頭中添加多個信息
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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')
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5.添加post請求參數
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import urllib.request
import urllib.parse
#設置post參數
page_data=urllib.parse.urlencode([
('pn',page_num),
('kd',keywords)
])
#設置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'
}
#打開網頁
req=urllib.request.Request(url,headers=page_headers)
data=urllib.request.urlopen(req,data=page_data.encode('utf-8')).read().decode('utf-8')
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6.利用phantomjs模擬瀏覽器請求
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#1.下載phantomjs安裝到本地,並設置環境變量
from selenium import webdriver
bs=webdriver.PhantomJS()
#打開url
bs.get(url)
#獲取網頁源碼
url_data=bs.page_source
#將瀏覽到的網頁保存為圖片
bs.get_screenshot_as_file(filename)
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7.phantomjs設置user-agent和cookie
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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)
#刪除cookie
bs.delete_all_cookies()
#設置cookie
#cookie格式：在瀏覽器cookie中查看，一個cookie需要包含以下參數，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)
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8.利用web_driver工具
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#1.下載web_driver工具（如chromdriver.exe）及對應的瀏覽器
#2.將chromdriver.exe放到某個目錄，如c:\chromdriver.exe
from selenium import webdriver
driver=webdriver.Chrome(executable_path="C:\chromdriver.exe")
#打開url
driver.get(url)
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