Python实现的爬取百度贴吧图片功能完整示例

本文实例讲述了Python实现的爬取百度贴吧图片功能。分享给大家供大家参考，具体如下：#co

本文实例讲述了Python实现的爬取百度贴吧图片功能。分享给大家供大家参考，具体如下：

#coding:utf-8
import requests
import urllib2
import urllib
```
from lxml import etree
class Tieba:
 def __init__(self):
 self.tiebaName = raw_input("请输入需要爬取的贴吧:")
 self.beginPage = int(raw_input("请输入爬取的起始页："))
 self.endPage = int(raw_input("请输入爬取的结束页："))
 self.baseURL = "http://tieba.baidu.com"
 #self.headers = {"User-Agent" : "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.86 Safari/537.36"}
 self.headers = {"User-Agent" : "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1 Trident/5.0;"} def startWork(self):
 """
 发送贴吧每一页的url请求
 """
 for page in range(self.beginPage, self.endPage + 1):
 pn = (page - 1) * 50
 keyword = {"kw" : self.tiebaName, "pn" : pn}
 kw = urllib.urlencode(keyword)
 url = self.baseURL + "/f?" + kw
 #print url
 html = self.loadRequest(url)
 self.loadPage(html)
 def loadRequest(self, url):
 """
 发送请求，返回响应
 url: 发送请求的url地址
 """
 request = urllib2.Request(url, headers = self.headers)
 #request = urllib2.Request(url)
 response = urllib2.urlopen(request)
 return response.read()
 def loadPage(self, html):
 """
 提取每个帖子的url，并发送请求，获取响应
 html: 贴吧每一页的html
 """
 content = etree.HTML(html)
 print '------'
 print content
 # xpath 返回的所有匹配成功后的结果的列表
 #pagelink_list = content.xpath("//div[@class='threadlist_lz clearfix']/div/a[@class='j_th_tit']/@href")
 pagelink_list = content.xpath("//div[@class='col2_right j_threadlist_li_right']//div/a/@href")
 pagelink_list = content.xpath("//div[@class='t_con cleafix']//div/a/@href")
 for link in pagelink_list:
 print link
 self.loadImage(self.loadRequest(self.baseURL + link))
 def loadImage(self, html):
 """
 提取帖子里用户发送的图片的url地址
 html: 每个帖子的html
 """
 content = etree.HTML(html)
 imagelink_list = content.xpath("//div[@class='p_content ']//img[@class='BDE_Image']/@src")
 for link in imagelink_list:
 self.writeImage(self.loadRequest(link), link[-10:])
 def writeImage(self, data, filename):
 """
 将图片的响应数据，写入到本地磁盘里
 data: 图片的响应数据
 filename: 文件名(图片url的后10位)
 """
 print "正在保存图片...%s" % filename
 with open(filename, "wb") as f:
 f.write(data)
if __name__ == "__main__":
 tieba = Tieba()
 tieba.startWork()