这个互联网上的数据90%的访问都是爬虫来完成的，爬虫由于检索速度快，定向性高，效率高而受到许多公司和个人的喜爱，如果我们想把一个网站上的图片全部下载下来，可以会花费我们很多时间，如果用爬虫来做的话，我们只要输入一条命令，剩下的工作基本都由爬虫来做完了，是不是很神奇，比如我们爬https://www.dbmeinv.com/这个上面的图片

这个是爬下来之后的效果，我们来看一下原码吧：

# -*- coding:utf-8 -*-
import urllib
import urllib2
import re
import os
import time

class ImageSpider(object):
    num = 0;
    def __init__(self):
        pass

    def saveImage(self, imageUrl, imageName):
        headers = {"User-Agent" : "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_0) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/1    7.0.963.56 Safari/535.11"}
        request = urllib2.Request(imageUrl, headers = headers)
        imageData = urllib2.urlopen(request).read()
        fileName = imageName[-15:]
        with open(fileName, "wb") as f:
             f.write(imageData)

        print '正在保存图片：', imageName
        time.sleep(0.1)


    def getImageFormUrl(self, url):
        headers = {"User-Agent" : "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_0) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/1    7.0.963.56 Safari/535.11"}
        request = urllib2.Request(url, headers = headers)
        response = urllib2.urlopen(request)
        text = response.read()
        p1 = r"(?<=\(this\);\" src=\").+?\.jpg(?=\" />)"
        pattern = re.compile(p1)
        imgs = pattern.findall(text)
        print imgs
        for img in imgs:
            imageName = "pic/%d.jpg" % (ImageSpider.num)
            imageUrl = img
            print img
            self.saveImage(imageUrl, imageName)
            ImageSpider.num += 1


    def getImagePageRange(self, fromPage, toPage):

        os.system('mkdir pic')   #创建保存图片的目录

        i = int(fromPage)
        while i <= int(toPage):
            url = "http://www.dbmeinv.com/?pager_offset=" + str(i)
            print url
            print "\n第%d页" % i
            self.getImageFormUrl(url)
            i += 1

imageSpider = ImageSpider()
beginPage = raw_input("输入开始页：")
endPage = raw_input("输入结束页：")
imageSpider.getImagePageRange(beginPage, endPage)