Python项目-Day46-Scrapy框架之利用ImagesPipeline下载图片.md
https://blog.csdn.net/qq_37892223/article/details/82807331?utm_medium=distribute.pc_relevant_t0.none-task-blog-OPENSEARCH-1.control&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-OPENSEARCH-1.control
##Python项目-Day46-Scrapy框架之利用ImagesPipeline下载图片
确定下载的图片
找到图片的url并存在items
item['img'] = link.select('div/a/img/@data-original').extract()[0]这里找图片的src时会有一个问题,明明在浏览器中使用检查看到图片上是有src属性的,但是用scrapy shell去取的时候并没有src属性,这是因为srcapy爬取的response中并没有src
这是浏览器检查时看到的,是有src的
<img class="thumb" style="width: 253px; height: 169px; display: inline;" data-original="https://www.ziyuan.tv/wp-content/themes/Git-alpha/timthumb.php?src=https://www.ziyuan.tv/wp-content/uploads/2015/02/162931fJ7.png&h=169&w=253&q=90&zc=1&ct=1" alt="圆梦站长网源码,DEDECMS内核,站长资源下载站源码,站长类站点源码" src="https://www.ziyuan.tv/wp-content/themes/Git-alpha/timthumb.php?src=https://www.ziyuan.tv/wp-contentuploads/2015/02/162931fJ7.png&h=169&w=253&q=90&zc=1&ct=1">
但是,其实源代码是这样的:
<img class="thumb" style="width:253px;height:169px" data-original="https://www.ziyuan.tv/wp-content/themes/Git-alpha/timthumb.php?src=https://www.ziyuan.tv/wp-content/uploads/2015/02/162931fJ7.png&h=169&w=253&q=90&zc=1&ct=1" alt="圆梦站长网源码,DEDECMS内核,站长资源下载站源码,站长类站点源码" />
解决方法:
可以使用data-original代替src(最简单的方法)
取到图片的url之后,交给管道处理
新建一个类GetImagePipeline(注意一定要继承ImagesPipeline)
from scrapy.pipelines.images import ImagesPipeline
可以事先在另一个管道先进行数据清理.
定义请求的request的headers
default_headers = { 'accept': 'image/webp,image/*,*/*;q=0.8', 'accept-encoding': 'gzip, deflate, sdch, br', 'accept-language': 'zh-CN,zh;q=0.8,en;q=0.6', 'cookie': 'bid=yQdC/AzTaCw', 'referer': '', 'user-agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36', }重写file_path方法,定义图片的文件名
def file_path(self, request, response=None, info=None): print("执行了file_path方法") item = request.meta['item'] folder = item['title'] # folder_strip = self.strip(folder) image_guid = request.url.split('/')[-1] filename = u'full/{0}/{1}'.format(folder, image_guid) return filename其中meta是用来在两个方法之间传递参数的
重写get_media_requests方法来请求图片
def get_media_requests(self, item, info): print("执行了get_media_requests") referer = item['img'] self.default_headers['referer'] = referer yield Request(item['img'], headers=self.default_headers, meta={'item': item, 'referer': referer})重写item_completed方法完成了图片
def item_completed(self, results, item, info): print("--------results-------") print(results) print("执行了item_completed方法") image_paths = [x['path'] for ok, x in results if ok] if not image_paths: raise DropItem("Item contains no images") return itemresults是一个元组列表
[(True, {'url': 'https://www.ziyuan.tv/wp-content/themes/Git-alpha/timthumb.php?src=https://www.ziyuan.tv/wp-content/uploads/2018/05/aa9c9f7dd639cc0262d9eb583398abc1-4.png&h=169&w= 253&q=90&zc=1&ct=1', 'path': "full/['爱搜资源网整站源码清新蓝调模板后台地址 admin1 账号刘小顺 520 密码 lzs128451此处内容已经被作者隐藏，请输入验证码查看内容验证码：请关注本站微信公 众号，回复“验证码”，获取验证码。在微信里搜索“ 小说骑士”或者“ziyuan_tv”或者微信扫描右侧二维码都可以关注本站微信公众号。此处内容已经被作者隐藏，请输入验证码查看内容验……']/aa9 c9f7dd639cc0262d9eb583398abc1-4.png&h=169&w=253&q=90&zc=1&ct=1", 'checksum': '67b69ec35fa370d03ed9a314252821f3'})]最后,需要在settings.py中进行设置
#设置图片的下载路径 IMAGES_STORE = r'D:\images' #设置图片的过期天数,30天内不再重复抓取 IMAGES_EXPIRES = 30 #大图和小图 IMAGES_THUMBS = { 'big': (270, 270), 'small': (80, 80) }项目代码
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#设置图片下载路径 IMAGES_STORE = r'D:\images' IMAGES_EXPIRES = 30 IMAGES_THUMBS = { 'big': (270, 270), 'small': (80, 80) } imagePipelines
# Define your item pipelines here # # Don't forget to add your pipeline to the ITEM_PIPELINES setting # See: https://doc.scrapy.org/en/latest/topics/item-pipeline.html import pymysql import json import re from scrapy import Request from scrapy.exceptions import DropItem from scrapy.pipelines.images import ImagesPipeline # class MyspidersPipeline(object): # def process_item(self, item, spider): # # return item # print("**********pipelines******") # print(1,item) # with open("href.json",'w') as f: # json.dump({"href":item["href"]},f) # return item # def open_spider(self,spider): # print('open--------------') # def close_spider(self,spider): # print('close--------------') # json.dump(ensure_ascii=False) #ensure_ascii不要转化成ascii码 # 存储资源的基本信息 class ImagePipeline(object): def process_item(self, item, spider): if spider.name == "ziyuanSpider": print("执行了process_item方法") return item class GetImagePipeline(ImagesPipeline): default_headers = { 'accept': 'image/webp,image/*,*/*;q=0.8', 'accept-encoding': 'gzip, deflate, sdch, br', 'accept-language': 'zh-CN,zh;q=0.8,en;q=0.6', 'cookie': 'bid=yQdC/AzTaCw', 'referer': '', 'user-agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36', } id=0 def file_path(self, request, response=None, info=None): print("执行了file_path方法") item = request.meta['item'] folder = item['title'].strip()[0:5] # folder_strip = self.strip(folder) image_guid = re.findall(r'/(\w*)\.[jpg,png]',request.url)[1] filename = u'full/{0}/{1}'.format(folder,image_guid+".jpg") print("filename",filename) return filename def get_media_requests(self, item, info): print("执行了get_media_requests") referer = item['img'] self.default_headers['referer'] = referer yield Request(item['img'], headers=self.default_headers, meta={'item': item, 'referer': referer}) # def item_completed(self, results, item, info): print("--------results-------") print(results) print("执行了item_completed方法") 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-
import scrapy from scrapy.item import Item,Field class ZiyuanItem(scrapy.Item): href=Field()#域 title=Field() date=Field() resourse_type=Field() img=Field() image_paths = Field() -
import scrapy from urllib import parse import string from myspiders.items import ZiyuanItem class ZiyuanspiderSpider(scrapy.Spider): name = 'ziyuanSpider' allowed_domains = ['ziyuan.tv'] start_urls = ["https://www.ziyuan.tv/yuanma/"] custom_settings = { # 'SOME_SETTING': 'some value', "ITEM_PIPELINES":{ # 'myspiders.pipelines.ResPipeline': 400, 'myspiders.imagePipelines.ImagePipeline': 400, 'myspiders.imagePipelines.GetImagePipeline': 500, } } def start_requests(self): url_s = "https://www.ziyuan.tv/" query={ "search":"资源", } for i in range(1,3): url = url_s + "search" + '/' + query["search"] + '/page/' + str(i) url = parse.quote(url, safe=string.printable) print(url) yield scrapy.FormRequest(url=url,callback=self.parse) def parse(self, response): print("开始解析数据") links=response.xpath('//div[@class="card-item"]') items=[] for link in links: item = ZiyuanItem() item['title'] = link.xpath('p/text()').extract()[0] item['href'] = link.xpath('div/a/@href').extract()[1] item['date'] = link.xpath('div[@class="cardpricebtn"]/text()').extract() item['resourse_type'] = link.xpath('.//a[@class="metacat"]/text()').extract() item['img'] = link.select('div/a/img/@data-original').extract()[0] print("-------------------") print("item:",item) items.append(item) yield item print("回来-----------------") return items
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