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发布网友发布时间：2024-10-21 14:29

共1个回答

热心网友时间：2024-11-06 11:12

# coding=utf-8
import re
import sys
import time

import requests
from lxml import etree

import importlib
importlib.reload(sys)

#定义一个爬虫
class spider(object):
    def __init__(self):
        print('开始爬取内容。。。')

#getsource用来获取网页源代码
    def getsource(self,url):
        html = requests.get(url)
        return html.text

#changepage用来生产不同页数的链接
    def changepage(self,url,total_page):
        if re.search('index_(\d+)',url,re.S):
            now_page = int(re.search('index_(\d+)',url,re.S).group(1))   #可修改
        else:
            now_page = 0
        page_group = []
        for i in range(now_page,total_page+1):
            link = re.sub('index_\d+','index_%s'%i,url,re.S)       #可修改
            page_group.append(link)
        return page_group

#getpic用来爬取一个网页图片
    def getpic(self,source):
        selector = etree.HTML(source)
        pic_url = selector.xpath('//ul[@class="ali"]/li/div/a/img/@src')   #可修改
        return pic_url

#savepic用来保存结果到pic文件夹中
    def savepic(self,pic_url):
        picname=re.findall('(\d+)',link,re.S)    #可修改
        picnamestr = ''.join(picname)
        i=0
        for each in pic_url:
            print('now downloading:{}'.format(each))
            pic = requests.get(each)
            fp = open('pic\\'+picnamestr +'-'+str(i)+ '.jpg', 'wb')
            fp.write(pic.content)
            fp.close()
            i += 1

#ppic集合类的方法
    def ppic(self, link):
        print('正在处理页面：{}'.format(link))
        html = picspider.getsource(link)
        pic_url = picspider.getpic(html)
        picspider.savepic(pic_url)

if __name__ == '__main__':
    start = time.time()
    url = 'http://www.baidu.com/'   #可修改
    picspider = spider()
    all_links = picspider.changepage(url,3)     #可修改
    for link in all_links:
        picspider.ppic(link)
    end = time.time()
    print('耗时:{}'.format(start-end))

代码质量很一般，都懒得细看了，直接给你加了个if判断。

建议看看嵩天教授的爬虫课，那个水平高一点。