Python urllib、urllib2、httplib抓取网页代码实例

使用urllib2，太强大了
试了下用代理登陆拉取cookie，跳转抓图片......
文档：http://docs.python.org/library/urllib2.html

直接上demo代码了
包括：直接拉取，使用Reuqest(post/get),使用代理，cookie,跳转处理

#!/usr/bin/python# -*- coding:utf-8 -*-# urllib2_test.py# author: wklken# 2012-03-17 wklken@yeah.netimport urllib,urllib2,cookielib,socketurl = "http://www.testurl....." #change yourself#最简单方式def use_urllib2(): try:  f = urllib2.urlopen(url, timeout=5).read() except urllib2.URLError, e:  print e.reason print len(f)#使用Requestdef get_request(): #可以设置超时 socket.setdefaulttimeout(5) #可以加入参数 [无参数，使用get，以下这种方式，使用post] params = {"wd":"a","b":"2"} #可以加入请求头信息，以便识别 i_headers = {"User-Agent": "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.1) Gecko/20090624 Firefox/3.5",       "Accept": "text/plain"} #use post,have some params post to server,if not support ,will throw exception #req = urllib2.Request(url, data=urllib.urlencode(params), headers=i_headers) req = urllib2.Request(url, headers=i_headers) #创建request后，还可以进行其他添加,若是key重复，后者生效 #request.add_header('Accept','application/json') #可以指定提交方式 #request.get_method = lambda: 'PUT' try:  page = urllib2.urlopen(req)  print len(page.read())  #like get  #url_params = urllib.urlencode({"a":"1", "b":"2"})  #final_url = url + "?" + url_params  #print final_url  #data = urllib2.urlopen(final_url).read()  #print "Method:get ", len(data) except urllib2.HTTPError, e:  print "Error Code:", e.code except urllib2.URLError, e:  print "Error Reason:", e.reasondef use_proxy(): enable_proxy = False proxy_handler = urllib2.ProxyHandler({"http":"http://proxyurlXXXX.com:8080"}) null_proxy_handler = urllib2.ProxyHandler({}) if enable_proxy:  opener = urllib2.build_opener(proxy_handler, urllib2.HTTPHandler) else:  opener = urllib2.build_opener(null_proxy_handler, urllib2.HTTPHandler) #此句设置urllib2的全局opener urllib2.install_opener(opener) content = urllib2.urlopen(url).read() print "proxy len:",len(content)class NoExceptionCookieProcesser(urllib2.HTTPCookieProcessor): def http_error_403(self, req, fp, code, msg, hdrs):  return fp def http_error_400(self, req, fp, code, msg, hdrs):  return fp def http_error_500(self, req, fp, code, msg, hdrs):  return fpdef hand_cookie(): cookie = cookielib.CookieJar() #cookie_handler = urllib2.HTTPCookieProcessor(cookie) #after add error exception handler cookie_handler = NoExceptionCookieProcesser(cookie) opener = urllib2.build_opener(cookie_handler, urllib2.HTTPHandler) url_login = "https://www.yourwebsite/?login" params = {"username":"user","password":"111111"} opener.open(url_login, urllib.urlencode(params)) for item in cookie:  print item.name,item.value #urllib2.install_opener(opener) #content = urllib2.urlopen(url).read() #print len(content)#得到重定向 N 次以后最后页面URLdef get_request_direct(): import httplib httplib.HTTPConnection.debuglevel = 1 request = urllib2.Request("http://www.google.com") request.add_header("Accept", "text/html,*/*") request.add_header("Connection", "Keep-Alive") opener = urllib2.build_opener() f = opener.open(request) print f.url print f.headers.dict print len(f.read())if __name__ == "__main__": use_urllib2() get_request() get_request_direct() use_proxy() hand_cookie()