Python爬虫XPATH

最新推荐文章于 2023-12-29 12:13:25 发布

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本文介绍了一种使用Python爬取百度贴吧中帖子图片的方法。通过发送HTTP请求获取贴吧页面源码，利用XPath解析帖子链接及图片地址，并下载保存图片。

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import urllib
import urllib.request
import lxml
from lxml import etree
a=0

def loadPage(url):
    """

    :param url:
    :param filename:
    :return:
    """

    request=urllib.request.Request(url=url)
    response=urllib.request.urlopen(request)
    html=response.read()
    # print(html)
    content=etree.HTML(html)
    #print(content)
    #返回的是所有匹配成功后匹配集合threadlist_lz clearfix
    #//div[@class="threadlist_lz clearfix"]//a[@"j_th_tit"]/ahref
    #//img[@"BDE_imge"]/@src

    link_list=content.xpath('//div[@class="t_con cleafix"]/div/div/div/a/@href')
    # print(link_list)
    for link in link_list:
        print(link)
        fulllink='http://tieba.baidu.com'+link
        # print(fulllink)
        loadImage(fulllink)



def loadImage(link):
    print(link)
    request=urllib.request.Request(link)
    response=urllib.request.urlopen(request)
    html=response.read()

    content=etree.HTML(html)
    #print(content)

    # link_list1=content.xpath('//div[@class="d_post_content j_d_post_content  clearfix]/')
    # print(link_list1)
    link_list=content.xpath('//img[@class="BDE_Image"]/@src')
    print(link_list)
    for link in link_list:
        writeImage(link)
        # print(link)


def writeImage(link):
    """

    # :param link:
    :return:
    """
    request=urllib.request.Request(link)
    image=urllib.request.urlopen(request).read()
    filename=link[-5:]
    with open(filename,'wb')as f:
        f.write(image)
    print('-'*30)
    print('打印是照片' + str(a))
    a=a+1



def tiebaSpider(url,beginPage,endpPage):
    for page in range(beginPage,endpPage+1):
        pn=(page-1)*50
        # filename='第'+str(page)+'页.html'
        fullurl=url+"&pn"+str(pn)
        html=loadPage(fullurl)


if __name__=="__main__":
    kw=input('请输入你要需要爬取的贴吧名:')
    beginPage=int(input('请输入起始页'))
    endPage=int(input('请输入结束页'))
    url='https://tieba.baidu.com/f?'
    kw1={'kw':kw}
    key = urllib.parse.urlencode(kw1)
    fullurl=url+key
    print(fullurl)

    tiebaSpider(fullurl,beginPage,endPage)