Scrapy and Selenium

How to scrapy js?

scrapy结合webkit抓取js生成的页面 http://www.cnblogs.com/Safe3/archive/2011/10/19/2217965.html

rc arch diagram

 

pip install -U selenium

Selenium IDE
http://docs.seleniumhq.org/projects/ide/

Download the server separately, from: http://selenium-release.storage.googleapis.com/2.40/selenium-server-standalone-2.40.0.jar

java -jar selenium-server-standalone-2.40.0.jar

下面我们开始一步步来做:
1. 首先,进入你的电脑上Selenium Server的jar包所在的目录,通过java -jar xxx.jar的方式运行它,程序会自动监听本地的4444端口;
2. 参考我的上一篇博文《如何连入一台没有外网IP的服务器》 ,将本地的4444端口与服务器的4444端口建立Remote映射;
3. 使用Scrapy框架开始编写python程序,具体的例子不再赘述,网上有许多例子,比如这个:https://gist.github.com/1045108。仅描述几个要点:
a) 在python里调用selenium这样写:
self.sel = selenium(“localhost”, 4444, “*firefox”,”http://example.com/”)
不过直接写 “*firefox” 可能会找不到Firefox的路径,这时可以强制指定Firefox的程序路径,比如:”*firefox D:/Program Files/Mozilla Firefox/firefox.exe”。
b) 获取Firefox渲染完成后的HTML代码:

sel = self.selenium
sel.open(response.url)
sel.wait_for_page_to_load(10000)
html = sel.get_eval(“selenium.browserbot.getCurrentWindow().document.getElementsByTagName(‘html’)[0].innerHTML”)

 

from selenium import selenium
from scrapy.spider import BaseSpider
from scrapy.http import Request
import time
import lxml.html
 
class SeleniumSprider(BaseSpider):
    name = "selenium"
    allowed_domains = ['selenium.com']
    start_urls = ["http://localhost"]
    
    def __init__(self,  **kwargs):
        print kwargs
        self.sel = selenium("localhost", 4444, "*firefox","http://selenium.com/")
        self.sel.start()
    
    def parse(self, response):
        sel = self.sel
        sel.open("/index.aspx")
        sel.click("id=radioButton1")
        sel.select("genderOpt", "value=male")
        sel.type("nameTxt", "irfani")
        sel.click("link=Submit")
        time.sleep(1) #wait a second for page to load
        root = lxml.html.fromstring(sel.get_html_source())

 

参考:
http://networkedblogs.com/F9Eph

https://pypi.python.org/pypi/selenium

http://docs.seleniumhq.org/download/

http://yupengyan.com/scrapy-and-selenium.html

posted @ 2016-04-21 13:58  午时的海  阅读(559)  评论(0编辑  收藏  举报