JAVA高级面试进阶训练营视频教程

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第一：urlopen出现403

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import urllib
 
url = "http://www.google.com/translate_a/t?client=t&sl=zh-CN&tl=en&q=%E7%94%B7%E5%AD%A9"
#浏览器头
headers = {'User-Agent':'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6'}
req = urllib2.Request(url=url,headers=headers)
data = urllib.request.urlopen(req).read()
print data

二：urlretrieve 出现403（转载自：https://www.213.name/archives/1087/comment-page-1）

出现该错误的原因是服务器开启了反爬虫，一般情况下只需要设置header模拟浏览器即可，但是urlretrieve并未提供header参数。

使用urlopen也可以直接下载文件，例

headers = {"User-Agent": "Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.86 Safari/537.36"}
def down_pic(url, path):
    try:
        req = request.Request(url, headers=headers)
        data = request.urlopen(req).read()
        with open(path, 'wb') as f:
            f.write(data)
            f.close()
    except Exception as e:
        print(str(e))

还有一种解决方法：

opener=urllib.request.build_opener()
opener.addheaders=[('User-Agent','Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1941.0 Safari/537.36')]
urllib.request.install_opener(opener)
urllib.request.urlretrieve(url, Path)

另外附上一些uses_agents:

 user_agents = [
                    'Mozilla/5.0 (Windows; U; Windows NT 5.1; it; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11',
                    'Opera/9.25 (Windows NT 5.1; U; en)',
                    'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)',
                    'Mozilla/5.0 (compatible; Konqueror/3.5; Linux) KHTML/3.5.5 (like Gecko) (Kubuntu)',
                    'Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.12) Gecko/20070731 Ubuntu/dapper-security Firefox/1.5.0.12',
                    'Lynx/2.8.5rel.1 libwww-FM/2.14 SSL-MM/1.4.1 GNUTLS/1.2.9',
                    "Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.7 (KHTML, like Gecko) Ubuntu/11.04 Chromium/16.0.912.77 Chrome/16.0.912.77 Safari/535.7",
                    "Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:10.0) Gecko/20100101 Firefox/10.0 ",
 
                    ]

 

原文地址：https://blog.csdn.net/qq_34309753/article/details/81502529