Python使用lxml实现网页自动提交与抓取

import urllib

import urllib2

import urlparse

import lxml.html

def url_with_query(url, values):

parts = urlparse.urlparse(url)

rest, (query, frag) = parts[:-2], parts[-2:]

return urlparse.urlunparse(rest + (urllib.urlencode(values), None))

def make_open_http():

opener = urllib2.build_opener(urllib2.HTTPCookieProcessor())

opener.addheaders = [] # pretend we're a human -- don't do this

def open_http(method, url, values={}):

if method == "POST":

return opener.open(url, urllib.urlencode(values))

else:

return opener.open(url_with_query(url, values))

return open_http

open_http = make_open_http()

tree = lxml.html.fromstring(open_http("GET", "https://www.jb51.net").read())

form = tree.forms[0]

form.fields["q"] = "eplussoft"

form.action="https://www.jb51.net/search"

response = lxml.html.submit_form(form,open_http=open_http)

html = response.read()

doc = lxml.html.fromstring(html)

lxml.html.open_in_browser(doc)