一个简单的Python网络爬虫(抓图),针对某论坛.

 1 #coding:utf-8
 2 import urllib2
 3 import re
 4 import threading
 5
 6 #图片下载
 7 def loadImg(addr,x,y,artName):
 8     data = urllib2.urlopen(addr).read()
 9     f = open(artName.decode("utf-8")+str(y)+‘.jpg‘, ‘wb‘)
10     f.write(data)
11     f.close()
12
13 #具体帖子页面解析,得到图片链接地址,并使用loadImg下载 artName为帖子名
14 def getImgLink(html,x,artName):
15     relink = ‘<img src=".*" file="(.*)" width=".*" id=".*" alt=".*.jpg" />‘
16     cinfo = re.findall(relink,html)
17     y = 0
18     for lin in cinfo:
19         imgAddr =  ‘http://www.xxx.com/‘+lin
20         print "LoadImg:"+str(x),imgAddr+‘\n‘
21         t = threading.Thread(target=loadImg(imgAddr,x,y,artName)) #使用threading 多线程下载
22         t.start()
23         y = y+1
24
25 #论坛版块页面解析,得到具体帖子链接
26 def getArticleLink(html,page):
27     relink = ‘<a href="(viewthread\.php\?tid=.*3D.*)">(.*)</a>‘
28     cinfo = re.findall(relink,html)
29     x = 1
30     for lin in cinfo:
31         #print lin,‘\n‘
32         url="http://www.xxx.com/"+lin[0]
33         headers={"User-Agent":"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1"}
34         req = urllib2.Request(url,headers=headers)
35         response= urllib2.urlopen(req)
36         html = response.read()
37         getImgLink(html,x,lin[1])
38         x = x+1
39
40 start = 1 #起始页
41 end = 100 #终止页
42 for page in range(end):
43     url="http://www.xxx.com/forumdisplay.php?fid=19&page="+str(page+start)
44     headers={"User-Agent":"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1"}
45     req = urllib2.Request(url,headers=headers)
46     response= urllib2.urlopen(req)
47     html = response.read()
48     print‘Start‘
49     getArticleLink(html,page)