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Scrapy实战（快速爬取小姐姐）

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· 阅读数 30

前言

今天还是老老实实搞点东西吧，然后本周的算法题还没刷呢。

目标网站

Scrapy实战（快速爬取小姐姐）

分析

ok，明确了这个目标网站，那么接下来是如何分析爬取，我们的目标是爬取N页面

分页

首先点击下一页我们发现这个现象 https://pic.netbian.com/index_2.html 这个网站变了一下，并且是有规律的，所以我们直接提取出模板 https://pic.netbian.com/index_{}.html

获取页面图片

Scrapy实战（快速爬取小姐姐）

我们发现这个所以的（当前页面）的图片实在那个路径下，并且点击进去

Scrapy实战（快速爬取小姐姐） 里面还有一层。

那么这里就是图片了。

编码

现在我们大概懂了这个流程，我们就直接编码就行了。

项目结构

Scrapy实战（快速爬取小姐姐）

就这个非常简单 first就是咱们的爬虫 那么接下来就是干活了。

爬虫编写

import scrapy
from dome.items import DomeItem

class FirstSpider(scrapy.Spider):
    name = 'first'
    baseUrl="https://pic.netbian.com/index_{}.html"
    path_index = 2
    max_page = 10 #我们最多爬取10页数据
    # allowed_domains = ['www.baidu.com']
    start_urls = ['https://pic.netbian.com/index.html'] #首页
    domains = "https://pic.netbian.com"

    def parse(self, response):

        li_imgages = response.xpath('//*[@id="main"]/div[3]/ul/li')

        for li in li_imgages:
            link_image =self.domains + li.xpath("./a/@href").extract_first()
            image_name = li.xpath("./a/@title | ./a/img/@alt").extract_first()
            print(image_name)
            #在我们这块进入那个子页面
            item = DomeItem()
            item['image_name'] = image_name
            headers = {'referer':link_image}
            yield scrapy.Request(link_image,callback=self.parse_image,meta={'item':item},headers=headers)

        if(self.path_index <= self.max_page):
            url = self.baseUrl.format(self.path_index)
            self.path_index+=1
            print(url,"爬取完成")
            yield scrapy.Request(url,callback=self.parse)

    def parse_image(self,response):
        item = response.meta['item']
        image_src =  self.domains + response.xpath('//*[@id="img"]/img/@src').extract_first()
        item['image_src'] = image_src

        yield item

item编写

这个里的话就两个，图片名称和url

# Define here the models for your scraped items
#
# See documentation in:
# https://docs.scrapy.org/en/latest/topics/items.html

import scrapy


class DomeItem(scrapy.Item):
    # define the fields for your item here like:
    # name = scrapy.Field()
    image_name = scrapy.Field()
    image_src = scrapy.Field()

保存与设置UA

之后交给管道下载

# Define your item pipelines here
#
# Don't forget to add your pipeline to the ITEM_PIPELINES setting
# See: https://docs.scrapy.org/en/latest/topics/item-pipeline.html


# useful for handling different item types with a single interface
from itemadapter import ItemAdapter

'''
open_spider
close_spider
return item 传递下一个需要被执行的piple
'''
import scrapy
from scrapy.pipelines.images import ImagesPipeline
class DomePipeline(ImagesPipeline):

    def get_media_requests(self, item, info):
        #请求图片数据
        yield scrapy.Request(item['image_src'])

    def file_path(self, request, response=None, info=None, *, item=None):
        return item['image_name']+'.jpg'

    def item_completed(self, results, item, info):
        '传递给下一个，如果你还有一个piple的话'
        return item

这里注意在配置文件里面设置保存路径

当然还有headers,我这里就这直接在中间件里面处理了。当然你其实也可以直接传参数

Scrapy实战（快速爬取小姐姐） 这里是因为这个

Scrapy实战（快速爬取小姐姐）

这个的话我直接把我的设置文件给出来了

# Scrapy settings for dome project
#
# For simplicity, this file contains only settings considered important or
# commonly used. You can find more settings consulting the documentation:
#
#     https://docs.scrapy.org/en/latest/topics/settings.html
#     https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
#     https://docs.scrapy.org/en/latest/topics/spider-middleware.html

BOT_NAME = 'dome'

SPIDER_MODULES = ['dome.spiders']
NEWSPIDER_MODULE = 'dome.spiders'


# Crawl responsibly by identifying yourself (and your website) on the user-agent
USER_AGENT = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.36'
LOG_LEVEL = 'ERROR'
# Obey robots.txt rules
ROBOTSTXT_OBEY = False
IMAGES_STORE='./'
USER_AGENT_LIST=[
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/22.0.1207.1 Safari/537.1",
    "Mozilla/5.0 (X11; CrOS i686 2268.111.0) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.57 Safari/536.11",
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.6 (KHTML, like Gecko) Chrome/20.0.1092.0 Safari/536.6",
    "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.6 (KHTML, like Gecko) Chrome/20.0.1090.0 Safari/536.6",
    "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/19.77.34.5 Safari/537.1",
    "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.9 Safari/536.5",
    "Mozilla/5.0 (Windows NT 6.0) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.36 Safari/536.5",
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1063.0 Safari/536.3",
    "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1063.0 Safari/536.3",
    "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; SE 2.X MetaSr 1.0; SE 2.X MetaSr 1.0; .NET CLR 2.0.50727; SE 2.X MetaSr 1.0)",
    "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1062.0 Safari/536.3",
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1062.0 Safari/536.3",
    "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; 360SE)",
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1061.1 Safari/536.3",
    "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1061.1 Safari/536.3",
    "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1061.0 Safari/536.3",
    "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.24 (KHTML, like Gecko) Chrome/19.0.1055.1 Safari/535.24",
    "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/535.24 (KHTML, like Gecko) Chrome/19.0.1055.1 Safari/535.24"
]


# Configure maximum concurrent requests performed by Scrapy (default: 16)
#CONCURRENT_REQUESTS = 32

# Configure a delay for requests for the same website (default: 0)
# See https://docs.scrapy.org/en/latest/topics/settings.html#download-delay
# See also autothrottle settings and docs
#DOWNLOAD_DELAY = 3
# The download delay setting will honor only one of:
#CONCURRENT_REQUESTS_PER_DOMAIN = 16
#CONCURRENT_REQUESTS_PER_IP = 16

# Disable cookies (enabled by default)
COOKIES_ENABLED = True

# Disable Telnet Console (enabled by default)
#TELNETCONSOLE_ENABLED = False

# Override the default request headers:
#DEFAULT_REQUEST_HEADERS = {
#   'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
#   'Accept-Language': 'en',
#}

# Enable or disable spider middlewares
# See https://docs.scrapy.org/en/latest/topics/spider-middleware.html
#SPIDER_MIDDLEWARES = {
#    'dome.middlewares.DomeSpiderMiddleware': 543,
#}

# Enable or disable downloader middlewares
# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
# DOWNLOADER_MIDDLEWARES = {
#    'dome.middlewares.DomeDownloaderMiddleware': 543,
# }

DOWNLOADER_MIDDLEWARES = {
   'lagou.middlewares.LagouDownloaderMiddleware': 543,
}

# Enable or disable extensions
# See https://docs.scrapy.org/en/latest/topics/extensions.html
#EXTENSIONS = {
#    'scrapy.extensions.telnet.TelnetConsole': None,
#}

# Configure item pipelines
# See https://docs.scrapy.org/en/latest/topics/item-pipeline.html
#ITEM_PIPELINES = {
#    'dome.pipelines.DomePipeline': 300,
#}

# Enable and configure the AutoThrottle extension (disabled by default)
# See https://docs.scrapy.org/en/latest/topics/autothrottle.html
#AUTOTHROTTLE_ENABLED = True
# The initial download delay
#AUTOTHROTTLE_START_DELAY = 5
# The maximum download delay to be set in case of high latencies
#AUTOTHROTTLE_MAX_DELAY = 60
# The average number of requests Scrapy should be sending in parallel to
# each remote server
#AUTOTHROTTLE_TARGET_CONCURRENCY = 1.0
# Enable showing throttling stats for every response received:
#AUTOTHROTTLE_DEBUG = False

# Enable and configure HTTP caching (disabled by default)
# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html#httpcache-middleware-settings
#HTTPCACHE_ENABLED = True
#HTTPCACHE_EXPIRATION_SECS = 0
#HTTPCACHE_DIR = 'httpcache'
#HTTPCACHE_IGNORE_HTTP_CODES = []
#HTTPCACHE_STORAGE = 'scrapy.extensions.httpcache.FilesystemCacheStorage'

然后找到你的中间件

Scrapy实战（快速爬取小姐姐）

Scrapy实战（快速爬取小姐姐）

转载自:https://juejin.cn/post/7073440217919111199
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