scrapy实战3利用fiddler对手机app进行抓包爬虫图片下载（重写ImagesPipeline）：

时间：2023-03-09 19:56:46
scrapy实战3利用fiddler对手机app进行抓包爬虫图片下载（重写ImagesPipeline）：

关于fiddler的使用方法参考（http://jingyan.baidu.com/article/03b2f78c7b6bb05ea237aed2.html）

本案例爬取斗鱼 app

先利用fiddler分析抓包json数据如下图

scrapy实战3利用fiddler对手机app进行抓包爬虫图片下载（重写ImagesPipeline）：

通过分析发现变化的只有offset  确定item字段 开始编写代码

items.py

 import scrapy

 class DouyuItem(scrapy.Item):

     # define the fields for your item here like:

     # name = scrapy.Field()

     # 存储照片的名字

     nickname=scrapy.Field()

     # 照片的url路径

     imagelink=scrapy.Field()

     # 照片保存在本地的路径

     imagepath=scrapy.Field()

spider/Douyu.py

 import scrapy

 import json

 from douyu.items import DouyuItem

 class DouyuSpider(scrapy.Spider):

     name = "Douyu"

     allowed_domains = ["capi.douyucdn.cn"]

     offset=0

     url="http://capi.douyucdn.cn/api/v1/getVerticalRoom?limit=20&offset="

     start_urls = [url+str(offset)]

     def parse(self, response):

         # 将从json里获取的数据转换成python对象 data段数据集合 response.text获取内容

         data=json.loads(response.text)["data"]

         for each in data:

             item=DouyuItem()

             item["nickname"]=each["nickname"]

             item["imagelink"]=each["vertical_src"]

             yield item

         self.offset+=100

         yield scrapy.Request(self.url+str(self.offset),callback=self.parse)

pipelines.py

import scrapy

from scrapy.pipelines.images import ImagesPipeline

from douyu.items import DouyuItem

from scrapy.utils.project import get_project_settings

import os

class DouyuPipeline(object):

    def process_item(self, item, spider):

        return item

class ImagesPipelines(ImagesPipeline):

    IMAGES_STORE=get_project_settings().get("IMAGES_STORE")

    def get_media_requests(self, item, info):

        # get_media_requests的作用就是为每一个图片链接生成一个Request对象，这个方法的输出将作为item_completed的输入中的results，results是一个元组，

        # 每个元组包括(success, imageinfoorfailure)。如果success=true，imageinfoor_failure是一个字典，包括url/path/checksum三个key。

        image_url=item["imagelink"]

        yield scrapy.Request(image_url)

    def item_completed(self, results, item, info):

        # 固定写法，获取图片路径，同时判断这个路径是否正确，如果正确，就放到 image_path里，ImagesPipeline源码剖析可见

        image_path=[x["path"] for ok,x in results if ok]

        print(image_path)

        os.rename(self.IMAGES_STORE+'/'+image_path[0],self.IMAGES_STORE+"/"+item["nickname"]+".jpg")

        item["imagepath"]=self.IMAGES_STORE+"/"+item["nickname"]

settints.py

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

 # Scrapy settings for douyu project

 #

 # For simplicity, this file contains only settings considered important or

 # commonly used. You can find more settings consulting the documentation:

 #

 #     http://doc.scrapy.org/en/latest/topics/settings.html

 #     http://scrapy.readthedocs.org/en/latest/topics/downloader-middleware.html

 #     http://scrapy.readthedocs.org/en/latest/topics/spider-middleware.html

 import os

 BOT_NAME = 'douyu'

 SPIDER_MODULES = ['douyu.spiders']

 NEWSPIDER_MODULE = 'douyu.spiders'

 # Crawl responsibly by identifying yourself (and your website) on the user-agent

 #USER_AGENT = 'douyu (+http://www.yourdomain.com)'

 # Obey robots.txt rules

 ROBOTSTXT_OBEY = False

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

 #CONCURRENT_REQUESTS = 32

 # Configure a delay for requests for the same website (default: 0)

 # See http://scrapy.readthedocs.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 = {

     "USER_AGENT" : 'DYZB/2.290 (iPhone; iOS 9.3.4; Scale/2.00)'

 #   'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',

 #   'Accept-Language': 'en',

 }

 # Enable or disable spider middlewares

 # See http://scrapy.readthedocs.org/en/latest/topics/spider-middleware.html

 #SPIDER_MIDDLEWARES = {

 #    'douyu.middlewares.DouyuSpiderMiddleware': 543,

 #}

 # Enable or disable downloader middlewares

 # See http://scrapy.readthedocs.org/en/latest/topics/downloader-middleware.html

 #DOWNLOADER_MIDDLEWARES = {

 #    'douyu.middlewares.MyCustomDownloaderMiddleware': 543,

 #}

 # Enable or disable extensions

 # See http://scrapy.readthedocs.org/en/latest/topics/extensions.html

 #EXTENSIONS = {

 #    'scrapy.extensions.telnet.TelnetConsole': None,

 #}

 # Configure item pipelines

 # See http://scrapy.readthedocs.org/en/latest/topics/item-pipeline.html

 ITEM_PIPELINES = {

     # 'scrapy.pipelines.images.ImagesPipeline': 1,

      'douyu.pipelines.ImagesPipelines': 300,

 }

 # Images 的存放位置，之后会在pipelines.py里调用

 project_dir=os.path.abspath(os.path.dirname(__file__))

 IMAGES_STORE=os.path.join(project_dir,'images') #images可以随便取名

 # Enable and configure the AutoThrottle extension (disabled by default)

 # See http://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 http://scrapy.readthedocs.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'

数据：

scrapy实战3利用fiddler对手机app进行抓包爬虫图片下载（重写ImagesPipeline）：