本文实例讲述了Python3爬虫爬取英雄联盟高清桌面壁纸功能。分享给大家供大家参考,具体如下:

使用Scrapy爬虫抓取英雄联盟高清桌面壁纸

源码地址:https://github.com/snowyme/loldesk

开始项目前需要安装python3和Scrapy,不会的自行百度,这里就不具体介绍了

首先,创建项目

scrapy startproject loldesk

生成项目的目录结构

Python3爬虫爬取英雄联盟高清桌面壁纸功能示例【基于Scrapy框架】

首先需要定义抓取元素,在item.py中,我们这个项目用到了图片名和链接

import scrapy
class LoldeskItem(scrapy.Item):
  name = scrapy.Field()
  ImgUrl = scrapy.Field()
  pass

接下来在爬虫目录创建爬虫文件,并编写主要代码,loldesk.py

import scrapy
from loldesk.items import LoldeskItem
class loldeskpiderSpider(scrapy.Spider):
  name = "loldesk"
  allowed_domains = ["www.win4000.com"]
  # 抓取链接
  start_urls = [
    'http://www.win4000.com/zt/lol.html'
  ]
  def parse(self, response):
    list = response.css(".Left_bar ul li")
    for img in list:
      imgurl = img.css("a::attr(href)").extract_first()
      imgurl2 = str(imgurl)
      next_url = response.css(".next::attr(href)").extract_first()
      if next_url is not None:
        # 下一页
        yield response.follow(next_url, callback=self.parse)
      yield scrapy.Request(imgurl2, callback=self.content)
  def content(self, response):
    item = LoldeskItem()
    item['name'] = response.css(".pic-large::attr(title)").extract_first()
    item['ImgUrl'] = response.css(".pic-large::attr(src)").extract()
    yield item
    # 判断页码
    next_url = response.css(".pic-next-img a::attr(href)").extract_first()
    allnum = response.css(".ptitle em::text").extract_first()
    thisnum = next_url[-6:-5]
    if int(allnum) > int(thisnum):
      # 下一页
      yield response.follow(next_url, callback=self.content)

图片的链接和名称已经获取到了,接下来需要使用图片通道下载图片并保存到本地,pipelines.py:

from scrapy.pipelines.images import ImagesPipeline
from scrapy.exceptions import DropItem
from scrapy.http import Request
import re
class MyImagesPipeline(ImagesPipeline):
  def get_media_requests(self, item, info):
    for image_url in item['ImgUrl']:
      yield Request(image_url,meta={'item':item['name']})
  def file_path(self, request, response=None, info=None):
    name = request.meta['item']
    name = re.sub(r'[?\\*|“<>:/()0123456789]', '', name)
    image_guid = request.url.split('/')[-1]
    filename = u'full/{0}/{1}'.format(name, image_guid)
    return filename
  def item_completed(self, results, item, info):
    image_path = [x['path'] for ok, x in results if ok]
    if not image_path:
      raise DropItem('Item contains no images')
    item['image_paths'] = image_path
    return item

最后在settings.py中设置存储目录并开启通道:

# 设置图片存储路径
IMAGES_STORE = 'F:/python/loldesk'
#启动pipeline中间件
ITEM_PIPELINES = {
  'loldesk.pipelines.MyImagesPipeline': 300,
}

在根目录下运行程序:

scrapy crawl loldesk

大功告成!!!一共抓取到128个文件夹

Python3爬虫爬取英雄联盟高清桌面壁纸功能示例【基于Scrapy框架】

更多关于Python相关内容可查看本站专题:《Python Socket编程技巧总结》、《Python正则表达式用法总结》、《Python数据结构与算法教程》、《Python函数使用技巧总结》、《Python字符串操作技巧汇总》、《Python入门与进阶经典教程》及《Python文件与目录操作技巧汇总》

希望本文所述对大家Python程序设计有所帮助。

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