scrapy 之 4K美食图片下载

本文介绍了一个使用Scrapy框架实现的图片爬虫项目,详细展示了如何从特定网站抓取图片,包括代码实现、数据模型定义及配置设置。项目通过定义Spider类和Items模型,实现了图片URL的解析与下载,并设置了相应的下载管道。

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这里不说废话了直接上代码

 

# -*- coding: utf-8 -*-
import scrapy
from .. items import ImagenetItem

class ImageSpider(scrapy.Spider):
    name = 'image'
    allowed_domains = ['pic.netbian.com']
    # 请求最开始的url
    start_urls = ['http://pic.netbian.com/4kmeishi/']
    def parse(self, response):
        # 根据响应(response)来找到指定的内容   现在找到的是img的src属性
        img_list = response.xpath('//ul[@class="clearfix"]/li/a/img/@src')
        print(img_list)
        # 找到了很多src属性值   现在进行遍历   分别使用每一个
        for img in img_list:
            # 使用在items.py中创建的数据模型item
            item = ImagenetItem()
            # 拼接url   得到完整的下载地址
            src = 'http://pic.netbian.com' + img.extract()
            # 将得到的下载地址   放入到数据模型中
            # item['src'] = src
            # 下载地址要包在列表当中
            item['src'] = [src]
            # 将数据模型传输给管道
            yield item

        next_url = response.xpath('//div[@class="page"]/a[text()="下一页"]/@href').extract()
        # print('---------------------------------------------')
        # print(next_url)
        if len(next_url) != 0:
            print('----------------')
            url = 'http://pic.netbian.com' + next_url[0]
            # 将url传给scrapy.Request   得到的结果继续用self.parse进行处理
            yield scrapy.Request(url=url,callback=self.parse)

items.py

# -*- coding: utf-8 -*-

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

import scrapy


class ImagenetItem(scrapy.Item):
    # define the fields for your item here like:
    # name = scrapy.Field()
    src = scrapy.Field()
    pass

settings.py

# -*- coding: utf-8 -*-

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

BOT_NAME = 'imageNet'

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


# Crawl responsibly by identifying yourself (and your website) on the user-agent
#USER_AGENT = 'imageNet (+http://www.yourdomain.com)'

# Obey robots.txt rules
# ROBOTSTXT_OBEY = True

# 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://doc.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 = False

# 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://doc.scrapy.org/en/latest/topics/spider-middleware.html
#SPIDER_MIDDLEWARES = {
#    'imageNet.middlewares.ImagenetSpiderMiddleware': 543,
#}

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

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

# Configure item pipelines
# See https://doc.scrapy.org/en/latest/topics/item-pipeline.html
ITEM_PIPELINES = {
   # 'imageNet.pipelines.ImagenetPipeline': 300,
    #scrapy中  专门负责图片下载的管道
    'scrapy.pipelines.images.ImagesPipeline':1
}
# 图片的存储路径
IMAGES_STORE = 'imageDownLoad'
# 图片的下载地址  根据item中的字段来设置哪一个内容需要被下载
IMAGES_URL_FIELD = 'src'
# Enable and configure the AutoThrottle extension (disabled by default)
# See https://doc.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://doc.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'

 

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