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scrapy使用PhantomJS爬取数据

2018-01-11 20:07 出处:清屏网 人气: 评论(0

环境:python2.7+scrapy+selenium+PhantomJS

内容:测试scrapy+PhantomJS

爬去内容:涉及到js加载更多的页面

原理:配置文件打开中间件+修改process_request函数(在里面增加PhantomJS操作)

第一步:

settings.py

DOWNLOADER_MIDDLEWARES = {
    'dbdm.middlewares.DbdmSpiderMiddleware': 543,
}

项目不一样名字会改变不影响。

第二步:

----------默认开启PhantomJS

middlewares.py

上面需要加载selenium 
from selenium import webdriver
#........省略部分代码 
@classmethod
    def process_request(cls, request, spider):
        #if request.meta.has_key('PhantomJS'):
        driver = webdriver.PhantomJS('E:\\p_python\\Scripts\\phantomjs\\bin\\phantomjs.exe') 
        driver.get(request.url)
        if request.url=='https://movie.douban.com/tag':
            driver.find_element_by_xpath('//*[@id="app"]/div/div[1]/div[1]/ul[1]/li[5]/span').click()
            time.sleep(5)
            if driver.find_element_by_xpath('//*[@id="app"]/div/div[1]/a'):
                click_more(driver)
        content = driver.page_source.encode('utf-8')
        #print content
        #file = open(path.join(d, '1.txt'),'w')
        #file.write(content)
        #file.close()
        driver.quit()  
        return HtmlResponse(request.url, encoding='utf-8', body=content, request=request)



def click_more(driver,i=1):
    driver.find_element_by_xpath('//*[@id="app"]/div/div[1]/a').click()
    print str(i)+'  click'
    time.sleep(5)
    i = i+1
    try:
        more_btn = driver.find_element_by_xpath('//*[@id="app"]/div/div[1]/a')
        if more_btn:
            click_more(driver,i)
    except:
        print 'click Over!!'

 

上面只是测试的代码,具体根据自己的项目更改,当前默认是打开PhantomJS访问url,可以通过判断。

-----------需要开启时再开启

判断key的值


上面需要加载selenium 
from selenium import webdriver 
#........省略部分代码 

@classmethod
    def process_request(cls, request, spider):
        if request.meta.has_key('PhantomJS'):
            driver = webdriver.PhantomJS('E:\\p_python\\Scripts\\phantomjs\\bin\\phantomjs.exe') 
            driver.get(request.url)
            content = driver.page_source.encode('utf-8')
            driver.quit()  
            return HtmlResponse(request.url, encoding='utf-8', body=content, request=request)

key的值设定在spider文件里面

import scrapy
from scrapy.linkextractors import LinkExtractor
from scrapy.spiders import CrawlSpider, Rule
from phantomjs_test.items import PhantomscrapyItem

class PhantomjsTestSpider(CrawlSpider):
    name = 'phantomjs_test'
    allowed_domains = ['book.com']
    start_urls = ['http://book.com/']
    #all_urls = []   去重似乎不需要
     rules = (
        ###获取所有的分页列表
        Rule(LinkExtractor(allow=r'/story/p/[2-9]*'), callback='parse', follow=True),
        ###获取里面所有的详情页
        #Rule(LinkExtractor(allow=r'/detail/p/[2-9]*'), callback = 'parse_item',follow=True),
    )

    ###从分页页面获取所有的文章url
    def parse(self, response):
        url_list = response.xpath('/a/@href').extract()
        for url in url_list:
            request = Request(url=url, callback=self.parse_item, dont_filter=True)
            request.meta['PhantomJS'] = True
            yield request

    def parse_item(self, response):
        item = PhantomscrapyItem()
        #i['domain_id'] = response.xpath('//input[@id="sid"]/@value').extract()
        #i['name'] = response.xpath('//div[@id="name"]').extract()
        #i['description'] = response.xpath('//div[@id="description"]').extract()
        item['bookName'] = response.xpath()
        items = []
        items.append(item)
        return items

以上便是默认打开与判断条件再打开的区别,根据页面不同可以设置,代码仍需要完善才能人性化。

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