Python爬虫-爬取贴吧中每个帖子内的楼主图片
# -*- coding:utf-8 -*- import urllib.request from lxml import etree def loadPage(url): """ 作用：根据url发送请求，获取服务器响应文件 url: 需要爬取的url地址 """ # headers = {"User-Agent" : "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_0) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11"} request = urllib.request.Request(url) html = urllib.request.urlopen(request).read() # 解析HTML文档为HTML DOM模型 content = etree.HTML(html) # print content # 返回所有匹配成功的列表集合 link_list = content.xpath('//div[@class="t_con cleafix"]/div/div/div/a/@href') # link_list = content.xpath('//a[@class="j_th_tit"]/@href') for link in link_list: fulllink = "http://tieba.baidu.com" + link # 组合为每个帖子的链接 # print link loadImage(fulllink) # 取出每个帖子里的每个图片连接 def loadImage(link): headers = { "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36"} request = urllib.request.Request(link, headers=headers) html = urllib.request.urlopen(request).read() # 解析 content = etree.HTML(html) # 取出帖子里每层层主发送的图片连接集合 # link_list = content.xpath('//img[@class="BDE_Image"]/@src') # link_list = content.xpath('//div[@class="post_bubble_middle"]') link_list = content.xpath('//img[@class="BDE_Image"]/@src') # 取出每个图片的连接 for link in link_list: print("link:" + link) writeImage(link) def writeImage(link): """ 作用：将html内容写入到本地 link：图片连接 """ # print "正在保存 " + filename headers = { "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36"} # 文件写入 request = urllib.request.Request(link, headers=headers) # 图片原始数据 image = urllib.request.urlopen(request).read() # 取出连接后10位做为文件名 filename = link[-10:] # 写入到本地磁盘文件内 with open("/Users/didi/Downloads/crawlertest/" + filename, "wb") as f: f.write(image) # print("已经成功下载 " + filename) def tiebaSpider(url, beginPage, endPage): """ 作用：贴吧爬虫调度器，负责组合处理每个页面的url url : 贴吧url的前部分 beginPage : 起始页 endPage : 结束页 """ for page in range(beginPage, endPage + 1): pn = (page - 1) * 50 filename = "第" + str(page) + "页.html" print(filename) fullurl = url + "&pn=" + str(pn) print(fullurl) loadPage(fullurl) # print html print("下载完成") if __name__ == "__main__": kw = input("请输入需要爬取的贴吧名:") beginPage = int(input("请输入起始页：")) endPage = int(input("请输入结束页：")) url = "http://tieba.baidu.com/f?" key = urllib.parse.urlencode({"kw": kw}) fullurl = url + key tiebaSpider(fullurl, beginPage, endPage)
