Scrapy框架学习 - 使用内置的ImagesPipeline下载图片

代码实现

打开终端输入

cd Desktop

scrapy startproject DouyuSpider

cd DouyuSpider

scrapy genspider douyu douyu.com

然后用Pycharm打开桌面生成的文件夹

douyu.py

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

class DouyuSpider(scrapy.Spider):
    name = 'douyu'
    allowed_domains = ['douyu.com']
    start_urls = ['http://api.douyucdn.cn/api/v1/getverticalRoom?limit=20&offset=1']

    def parse(self, response):
        yield scrapy.Request(
            url=response.url,
            callback=self.parse_all_page,
            meta={},
            dont_filter=True
        )

    def parse_one_page(self,response):
        json1 = response.text
        json1 = json.loads(json1)
        data_list = json1['data']
        for data in data_list:
            room_src = data['room_src']
            item = DouyuspiderItem()
            # 该字段必须是图片链接的可迭代对象，否则报错
            item['room_src']= [room_src]
            item['downloadUrl'] = [downloadUrl]
            yield item

    def parse_all_page(self,response):
        for page in range(1,501,20):
            url = 'http://api.douyucdn.cn/api/v1/getverticalRoom?limit=20&offset={}'.format(page)
            print(url)
            yield scrapy.Request(
                url=url,
                callback=self.parse_one_page,
                dont_filter=True,
                meta={}
            )

报错 : ValueError: Missing scheme in request url: h 

解决方法：将item['x'] = x改为item['x'] = [x]即可

items.py

class DouyuspiderItem(scrapy.Item):
    room_src = scrapy.Field()
    downloadUrl = scrapy.Field()

settings.py

ROBOTSTXT_OBEY = False

ITEM_PIPELINES = {
   # 'DouyuSpider.pipelines.DouyuspiderPipeline': 300,
    # 图片下载管道
    'scrapy.pipelines.images.ImagesPipeline':1,
    # 文件下载管道
    'scrapy.pipelines.files.FilesPipeline':2
}
# 图片的存储路径
IMAGES_STORE = 'file/image'
# 图片的下载地址，根据items中的字段来设置哪一个内容需要被下载
IMAGES_URLS_FIELD = 'room_src'

# 文件的存储路径
FILES_STORE = 'file/book'
# 文件的下载地址，根据items中的字段来设置哪一个内容需要被下载
FILES_URLS_FIELD = 'downloadUrl'

运行结果运行爬虫

将在配置文件中所配置的图片保存路径下，生成如下目录结构：

 full文件夹下的图片