selenium之京东商品爬虫

#今日目标

**selenium之京东商品爬虫**

自动打开京东首页，并输入你要搜索的东西，进入界面进行爬取信息

```
from selenium import webdriver
import time

class JdSpider(object):
    def __init__(self):
        self.browser=webdriver.Chrome()
        self.url='http://www.jd.com/'
        self.i=0


    #获取商品
    def get_page(self):
        #打开京东
        self.browser.get(self.url)
        #找两个节点
        self.browser.find_element_by_xpath('//*[@id="key"]').send_keys('Python书籍')
        self.browser.find_element_by_xpath('//*[@id="search"]/div/div[2]/button').click()
        #留出时间给页面加载
        time.sleep(2)


    #解析页面
    def  parse_page(self):
        # 把下拉菜单拉到底部,执行JS脚本
        self.browser.execute_script(
            'window.scrollTo(0,document.body.scrollHeight)'
        )
        time.sleep(2)


        #匹配所有商品节点对像列表
        li_list=self.browser.find_elements_by_xpath('//*[@id="J_goodsList"]/ul/li')
        for li in li_list:
            info = li.text.split('
')
            if info[0].startswith('每满'):
                price=info[1]
                name=info[2]
                number=info[3]
                market=info[4]
            elif info[0]=='单价':
                price = info[3]
                name = info[4]
                number = info[5]
                market = info[6]
            elif info[0].startswith('￥') and info[1].startswith('￥'):
                price = info[0]
                name = info[2]
                number = info[3]
                market = info[4]
            else:
                price = info[0]
                name = info[1]
                number = info[2]
                market = info[3]
            print(price,number,market,name)
            self.i += 1



    def main(self):
        self.get_page()
        while True:
            self.parse_page()
            #判断是否为最后一页
            if self.browser.page_source.find('pn-next disabled')==-1:
                # 不是最后一页，点击下一页
                self.browser.find_element_by_class_name('pn-next').click()
                time.sleep(3)
            else:
                break
        print(self.i)


if __name__ == '__main__':
    spider=JdSpider()
    spider.main()

```