都2021年了還沒爬過大家喜歡的美女圖片，上先爬取的成果。

簡介

基于Scrapy框架的美女網(wǎng)爬取

爬蟲入口地址：http://www.meinv.hk/?cat=2

如果你的爬蟲運(yùn)行正常卻沒有數(shù)據(jù)，可能的原因是訪問該網(wǎng)站需要梯子。

這里主要學(xué)習(xí)兩個(gè) 技術(shù)點(diǎn)、自定義圖片管道和自定義csv數(shù)據(jù)管道

實(shí)現(xiàn)流程

創(chuàng)建項(xiàng)目太簡單了，不說了。

打開網(wǎng)站

在點(diǎn)擊過程中，得到具體的爬取思路，先爬取熱門推薦的標(biāo)簽，然后在得到每一個(gè)美女的具體的圖片的網(wǎng)址。

那么就使用下rules。

rules內(nèi)規(guī)定了對響應(yīng)中url的爬取規(guī)則，爬取得到的url會(huì)被再次進(jìn)行請求，并根據(jù)callback函數(shù)和follow屬性的設(shè)置進(jìn)行解析或跟進(jìn)。

這里強(qiáng)調(diào)兩點(diǎn)：

一是會(huì)對所有返回的response進(jìn)行url提取，包括首次url請求得來的response；
二是rules列表中規(guī)定的所有Rule都會(huì)被執(zhí)行。

進(jìn)入到pipeline.py里面，引入 from scrapy.pipelines.images import ImagesPipeline, 并且繼承 ImagesPipeline

自定義pipeline可以基于scrapy自帶的ImagesPipeline的基礎(chǔ)上完成?？梢灾貙慖magesPipeline中的三個(gè)法:get_media_requests(),file_path(),item_completed(）

具體代碼

因?yàn)槭褂玫氖亲远x管道（圖片和CSV），因此不需要編寫「item.py」

mv.py

from?scrapy.linkextractors?import?LinkExtractor
from?scrapy.spiders?import?CrawlSpider,?Rule

class?MvSpider(CrawlSpider):
????name?=?'mv'
????allowed_domains?=?['www.meinv.hk']
????start_urls?=?['http://www.meinv.hk/?cat=2']

????#?增加提取?a?標(biāo)簽的href連接的規(guī)則
????#?將提取到的href連接，生成新的Request?請求，?同時(shí)指定新的請求后解析函數(shù)
????rules?=?(
????????#?allow?默認(rèn)使用正則的表達(dá)式，查找所有a標(biāo)簽的href
????????#?follow?為True時(shí)，表示在提取規(guī)則連接下載完成后，是否再次提取規(guī)則中連接
????????Rule(LinkExtractor(allow=r'p=\d+'),?callback='parse_item',?follow=True),

????)

????def?parse_item(self,?response):
????????item?=?{}
????????info?=?response.xpath('//div[@class="wshop?wshop-layzeload"]/text()').extract_first()
????????try:
????????????item['hometown']?=?info.split("/")[2].strip().split()[1]
????????????item['birthday']?=?info.split("/")[1].strip().split()[1]
????????except:
????????????item['birthday']?=?"未知"
????????????item['hometown']?=?"未知"
????????item['name']?=?response.xpath('//h1[@class="title"]/text()').extract_first()
????????images?=?response.xpath('//div[@class="post-content"]//img/@src')
????????try:
????????????item['image_urls']?=?images.extract()
????????except:
????????????item['image_urls']?=?''
????????item['images']?=?''
????????item['detail_url']?=?response.url
????????yield?item

middlewares.py

import?random

from?scrapy.downloadermiddlewares.useragent?import?UserAgentMiddleware


class?RandomUserAgentMiddleware(UserAgentMiddleware):
????def?__init__(self,?user_agent_list):
????????super().__init__()
????????self.user_agent_list?=?user_agent_list

????@classmethod
????def?from_crawler(cls,?crawler):
????????return?cls(user_agent_list=crawler.settings.get('USER_AGENT_LIST'))

????def?process_request(self,?request,?spider):
????????user_agent?=?random.choice(self.user_agent_list)
????????if?user_agent:
????????????request.headers['User-Agent']?=?user_agent
????????return?None

pipelines.py

import?csv
import?os
from?hashlib?import?sha1

from?scrapy?import?Request
from?scrapy.pipelines.images?import?ImagesPipeline
from?meinv?import?settings


class?MvImagePipeline(ImagesPipeline):
????def?get_media_requests(self,?item,?info):
????????for?url?in?item['image_urls']:
????????????yield?Request(url,?meta={'name':?item['name']})

????def?item_completed(self,?results,?item,?info):
????????#將下載完成后的圖片路徑設(shè)置到item中
????????item['images']?=?[x?for?ok,?x?in?results?if?ok]
????????return?item


????def?file_path(self,?request,?response=None,?info=None):
????????#?為每位人員創(chuàng)建一個(gè)目錄，存放她自己所有的圖片
????????author_name?=?request.meta['name']
????????author_dir?=?os.path.join(settings.IMAGES_STORE,?author_name)
????????if?not?os.path.exists(author_dir):
????????????os.makedirs(author_dir)
????????#從連接中提取文件名和擴(kuò)展名
????????try:
????????????filename?=?request.url.split("/")[-1].split(".")[0]
????????except:
????????????filename?=?sha1(request.url.encode(encoding='utf-8')).hexdigest()
????????try:
????????????ext_name?=?request.url.split(".")[-1]
????????except:
????????????ext_name?=?'jpg'

????????#?返回的相對路徑
????????return?'%s/%s.%s'?%?(author_name,?filename,?ext_name)


class?MeinvPipeline(object):
????def?__init__(self):
????????self.csv_filename?=?'meinv.csv'
????????self.existed_header?=?False
????def?process_item(self,?item,?spider):
????????#?item?dict對象，是spider.detail_parse()?yield{}輸出模塊
????????with?open(self.csv_filename,?'a',?encoding='utf-8')?as?f:
????????????writer?=?csv.DictWriter(f,?fieldnames=(
????????????????'name',?'hometown',?'birthday',?'detail_url'))
????????????if?not?self.existed_header:
????????????????#?如果文件不存在，則表示第一次寫入
????????????????writer.writeheader()
????????????????self.existed_header?=?True
????????????image_urls?=?''
????????????for?image_url?in?item['image_urls']:
????????????????image_urls?+=?image_url?+?','
????????????image_urls.strip("\"").strip("\'")
????????????data?=?{
????????????????'name':?item['name'].strip(),
????????????????'hometown':?item['hometown'],
????????????????'birthday':?item['birthday'].replace('年',?'-').replace('月',?'-').replace('日',?''),
????????????????'detail_url':?item['detail_url'],
????????????}
????????????writer.writerow(data)
????????????f.close()
????????return?item

Setting.py

import?os

BOT_NAME?=?'meinv'

SPIDER_MODULES?=?['meinv.spiders']
NEWSPIDER_MODULE?=?'meinv.spiders'

#?Obey?robots.txt?rules
ROBOTSTXT_OBEY?=?False

DOWNLOAD_DELAY?=?1

DOWNLOADER_MIDDLEWARES?=?{
???'meinv.middlewares.RandomUserAgentMiddleware':?543,
}

BASE_DIR?=?os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
#?ImagePipeline?存放圖片使用的目錄位置
IMAGES_STORE?=?os.path.join(BASE_DIR,?'images')

ITEM_PIPELINES?=?{
????'meinv.pipelines.MeinvPipeline':?300,
????'meinv.pipelines.MvImagePipeline':100
}


USER_AGENT_LIST?=?[
????'Mozilla/5.0?(Windows?NT?6.1;?Win64;?x64)?AppleWebKit/537.36?(KHTML,?like?Gecko)?Chrome/71.0.3578.98?Safari/537.36',
????'Mozilla/5.0?(Windows?NT?10.0;?WOW64;?Trident/7.0;?rv:11.0)?like?Gecko',
????'Mozilla/5.0?(Macintosh;?Intel?Mac?OS?X?10.6;?rv:2.0.1)?Gecko/20100101?Firefox/4.0.1'
]