Scrapy图像下载

Question

我的蜘蛛运行没有显示任何错误,但图像没有存储在文件夹中这里是我的scrapy文件:

Spider.py:

import scrapy
import re
import os
import urlparse
from scrapy.spiders import CrawlSpider, Rule
from scrapy.linkextractors import LinkExtractor
from scrapy.loader.processors import Join, MapCompose, TakeFirst
from scrapy.pipelines.images import ImagesPipeline
from production.items import ProductionItem, ListResidentialItem

class productionSpider(scrapy.Spider):
    name = "production"
    allowed_domains = ["someurl.com"]
    start_urls = [
        "someurl.com"
]

def parse(self, response):
    for sel in response.xpath('//html/body'):
        item = ProductionItem()
        img_url = sel.xpath('//a[@data-tealium-id="detail_nav_showphotos"]/@href').extract()[0]
        yield scrapy.Request(urlparse.urljoin(response.url, img_url),callback=self.parseBasicListingInfo,  meta={'item': item})

def parseBasicListingInfo(item, response):
    item = response.request.meta['item']
    item = ListResidentialItem()
    try:
        image_urls = map(unicode.strip,response.xpath('//a[@itemprop="contentUrl"]/@data-href').extract())
        item['image_urls'] = [ x for x in image_urls]
    except IndexError:
        item['image_urls'] = ''

    return item

settings.py:

from scrapy.settings.default_settings import ITEM_PIPELINES
from scrapy.pipelines.images import ImagesPipeline

BOT_NAME = 'production'

SPIDER_MODULES = ['production.spiders']
NEWSPIDER_MODULE = 'production.spiders'
DEFAULT_ITEM_CLASS = 'production.items'

ROBOTSTXT_OBEY = True
DEPTH_PRIORITY = 1
IMAGE_STORE = '/images'

CONCURRENT_REQUESTS = 250

DOWNLOAD_DELAY = 2

ITEM_PIPELINES = {
    'scrapy.contrib.pipeline.images.ImagesPipeline': 300,
}

items.py

# -*- coding: utf-8 -*-
import scrapy

class ProductionItem(scrapy.Item):
    img_url = scrapy.Field()

# ScrapingList Residential & Yield Estate for sale
class ListResidentialItem(scrapy.Item):
    image_urls = scrapy.Field()
    images = scrapy.Field()

    pass

我的管道文件是空的我不知道我想要添加到pipeline.py文件.

任何帮助是极大的赞赏.

Answer 1

由于你不知道在管道中放什么,我假设你可以使用scrapy提供的图像的默认管道,所以在settings.py文件中你只需声明它就像

ITEM_PIPELINES = {
'scrapy.pipelines.images.ImagesPipeline':1
}

此外,您的图像路径错误/意味着您将转到计算机的绝对根路径,因此您要么将绝对路径放在要保存的位置,要么只是从运行爬网程序的位置执行相对路径

IMAGES_STORE = '/home/user/Documents/scrapy_project/images'

要么

IMAGES_STORE = 'images'

现在,在蜘蛛中你提取了网址,但是你没有把它保存到项目中

item['image_urls'] = sel.xpath('//a[@data-tealium-id="detail_nav_showphotos"]/@href').extract_first()

image_urls如果您使用的是默认管道,那么该字段必须是字面上的.

现在,在items.py文件中,您需要添加以下2个字段(这两个字段都是必需的)

image_urls=Field()
images=Field()

这应该工作

Answer 2

我的工作结果:

spider.py:

import scrapy
import re
import urlparse
from scrapy.spiders import CrawlSpider, Rule
from scrapy.linkextractors import LinkExtractor
from scrapy.loader.processors import Join, MapCompose, TakeFirst
from scrapy.pipelines.images import ImagesPipeline
from production.items import ProductionItem
from production.items import ImageItem

class productionSpider(scrapy.Spider):
    name = "production"
    allowed_domains = ["url"]
    start_urls = [
        "startingurl.com"
    ]

def parse(self, response):
    for sel in response.xpath('//html/body'):
        item = ProductionItem()
        img_url = sel.xpath('//a[@idd="followclaslink"]/@href').extract()[0]
        yield scrapy.Request(urlparse.urljoin(response.url, img_url),callback=self.parseImages,  meta={'item': item})

def parseImages(self, response):
    for elem in response.xpath("//img"):
        img_url = elem.xpath("@src").extract_first()
        yield ImageItem(image_urls=[img_url])

Settings.py

BOT_NAME = 'production'

SPIDER_MODULES = ['production.spiders']
NEWSPIDER_MODULE = 'production.spiders'
DEFAULT_ITEM_CLASS = 'production.items'
ROBOTSTXT_OBEY = True
IMAGES_STORE = '/Users/home/images'

DOWNLOAD_DELAY = 2

ITEM_PIPELINES = {'scrapy.pipelines.images.ImagesPipeline': 1}
# Disable cookies (enabled by default)

items.py

# -*- coding: utf-8 -*-
import scrapy

class ProductionItem(scrapy.Item):
    img_url = scrapy.Field()
# ScrapingList Residential & Yield Estate for sale
class ListResidentialItem(scrapy.Item):
    image_urls = scrapy.Field()
    images = scrapy.Field()

class ImageItem(scrapy.Item):
    image_urls = scrapy.Field()
    images = scrapy.Field()

pipelines.py

import scrapy
from scrapy.pipelines.images import ImagesPipeline
from scrapy.exceptions import DropItem

class MyImagesPipeline(ImagesPipeline):

    def get_media_requests(self, item, info):
        for image_url in item['image_urls']:
            yield scrapy.Request(image_url)

    def item_completed(self, results, item, info):
        image_paths = [x['path'] for ok, x in results if ok]
        if not image_paths:
            raise DropItem("Item contains no images")
        item['image_paths'] = image_paths
        return item