python scrapy 爬当当数据

Posted 2021-02-18

scrapy startproject dangdang

 

cd dangdang

 

 

 

scrapy genspider dangdang "dangdang.com"

 

 

核心代码

dangdang.py

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

import scrapy
from copy import deepcopy
import json


class DangdangSpider(scrapy.Spider):
    name = ‘dangdang‘
    allowed_domains = [‘dangdang.com‘]
    start_urls = [‘http://e.dangdang.com/list-WY1-dd_sale-0-1.html‘]

    def parse(self, response):
        b_list = response.xpath("/html/body/div[5]/div[2]/div[1]/div/div")

        item = {}
        for first_level in b_list:
            item["b_cate_name"] = first_level.xpath(".//a/h3/text()").extract_first()
            item["b_cate_href"] = first_level.xpath(".//a/@href").extract_first()
            # print(item)
            li_list = first_level.xpath("./ul/li")
            # 特殊处理
            if len(li_list) > 0:
                for li in li_list:
                    item["s_cate_href"] = li.xpath(".//a/@href").extract_first()
                    item["s_cate_name"] = li.xpath(".//a/h4/text()").extract_first()
                    item["s_cate_type"] = li.xpath(".//a/h4/@data-type").extract_first()
                    item["s_books"] = "http://e.dangdang.com/media/api.go?action=mediaCategoryLeaf&promotionType=1" 
                                      "&deviceSerialNo=html5&macAddr=html5&channelType=html5&permanentId" 
                                      "=20200524135342174347312679598555233&returnType=json&channelId=70000" 
                                      "&clientVersionNo=5.8.4&platformSource=DDDS-P&fromPlatform=106&deviceType" 
                                      "=pconline&token=&start=1&end=3&category=" + item[
                                          "s_cate_type"] + "&dimension=dd_sale&order=0 "
                    yield scrapy.Request(
                        item["s_books"],
                        callback=self.parse_book_list,
                        meta={"item": deepcopy(item)}
                    )

                    # print(item)
            else:
                a_list = first_level.xpath("./ul/a")
                for a in a_list:
                    item["s_cate_href"] = a.xpath("@href").extract_first()
                    item["s_cate_name"] = a.xpath("./li/text()").extract_first()
                    item["s_cate_type"] = li.xpath("./li/@data-type").extract_first()
                    if item["s_cate_type"] is not None:
                        item["s_books"] = "http://e.dangdang.com/media/api.go?action=mediaCategoryLeaf&promotionType=1" 
                                          "&deviceSerialNo=html5&macAddr=html5&channelType=html5&permanentId" 
                                          "=20200524135342174347312679598555233&returnType=json&channelId=70000" 
                                          "&clientVersionNo=5.8.4&platformSource=DDDS-P&fromPlatform=106&deviceType" 
                                          "=pconline&token=&start=1&end=3&category=" + item[
                                              "s_cate_type"] + "&dimension=dd_sale&order=0 "
                        yield scrapy.Request(
                            item["s_books"],
                            callback=self.parse_book_list,
                            meta={"item": deepcopy(item)})

    def parse_book_list(self, response):
        item = response.meta["item"]
        data = json.loads(response.text)
        book_list = data[‘data‘].get(‘saleList‘, {})
        # print(book_list)
        if len(book_list) > 0:
            for book in book_list:
                item["book_author"] = book[‘mediaList‘][0]["authorPenname"]
                item["book_title"] = book[‘mediaList‘][0]["title"]
                print(item)




setting.py

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

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

BOT_NAME = ‘book‘

SPIDER_MODULES = [‘book.spiders‘]
NEWSPIDER_MODULE = ‘book.spiders‘
LOG_LEVEL = "WARNING"
USER_AGENT = ‘Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36‘

LOG_FILE="log.txt"


# Crawl responsibly by identifying yourself (and your website) on the user-agent
#USER_AGENT = ‘book (+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 https://docs.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://docs.scrapy.org/en/latest/topics/spider-middleware.html
#SPIDER_MIDDLEWARES = {
#    ‘book.middlewares.BookSpiderMiddleware‘: 543,
#}

# Enable or disable downloader middlewares
# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
#DOWNLOADER_MIDDLEWARES = {
#    ‘book.middlewares.BookDownloaderMiddleware‘: 543,
#}

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

# Configure item pipelines
# See https://docs.scrapy.org/en/latest/topics/item-pipeline.html
#ITEM_PIPELINES = {
#    ‘book.pipelines.BookPipeline‘: 300,
#}

# Enable and configure the AutoThrottle extension (disabled by default)
# See https://docs.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://docs.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‘