爬虫使用代理ip

获得代理IP的网站：
http://www.xicidaili.com/
验证代理是否可用的方式之一：

globalUrl = "http://ip.chinaz.com/getip.aspx"

如何使用代理：一 使用requests：

import requests

ip = "http://" + i[0]+":"+i[1]
ipdict = {"http":ip}
requests.get(globalUrl,headers = header,proxies = ipdict,timeout = 3).text

二 使用 urllib：　　　

import urllib

ip = "http://" + i[0]+":"+i[1]
ipdict = {"http":ip}
try:
print urllib.urlopen(globalUrl,proxies=ipdict).read()
except Exception,e:
print "%s can not use" % ip

三 使用urllib2的ProxyHandler模块：

proxy_info = {'host': i[0],
'port': i[1]}
proxy_support = urllib2.ProxyHandler({"http":"http://%(host)s:%(port)s" % proxy_info})
opener = urllib2.build_opener(proxy_support)
urllib2.install_opener(opener)
request = urllib2.Request(globalUrl,headers= header)
try:
print urllib2.urlopen(request,timeout = 3).read()
except Exception,e:
print "%s can not use" % proxy_info["host"]

如果需要验证：

proxy_info = {"host": "xxx",
"port": "xxx",
"user": "xxx",
"pass": "xxx"}
proxy_support = urllib2.ProxyHandler({"http":"http://%(user)s:%(pass)s@%(host)s:%(port)d" % proxy_info})

四 使用urllib2的request模块：

ip = i[0] + ":" + i[1]
request = urllib2.Request(globalUrl,headers =header)
request.set_proxy(ip,"http")
try:
print urllib2.urlopen(request,timeout=5).read()
except Exception,e:
print "%s can not use" % ip

五：使用httplib：

conn = httplib.HTTPConnection(i[0],i[1])
try:
conn.connect()
conn.request("GET",globalUrl,headers=header)
response = conn.getresponse()
print response.read()
except:
print "%s can not use" % i[0]