链接:https://jn.zu.ke.com/zufang
首先我们使用scrapy startproject Beike 这个命令创建一个scrapy爬虫项目,接着我们用pycharm打开项目,完善item
接着我们找到setting文件,把ROBOTSTXT_OBEY = True,注释掉,或删除,表示我们不遵守协议
设置请求头,伪装成浏览器,不设置直接识别scrapy爬虫框架,直接把你机器拉入黑名单
我们抓取的是页面上的信息字段
我们明确了item以后,我们开始一个scrapy爬虫项目,使用命令: scrapy genspider beike jn.zu.ke.com
beike ------ 是爬虫名字
beike jn.zu.ke.com – domain
接下来我们先编写爬虫文件先写解析列表页面,还有详情页面,我们先不进行翻页,一步一步实现:
代码如下:
# -*- coding: utf-8 -*-
import scrapy
from Beike.items import BeikeItem
import copy
class BeikeSpider(scrapy.Spider):
name = 'beike'
allowed_domains = ['jn.zu.ke.com']
start_urls = ['https://jn.zu.ke.com/zufang']
page = 2
def parse(self, response):
print(response.url)
node_list = response.xpath('//div[@class="content__list--item--main"]')
print(len(node_list))
item = BeikeItem()
for node in node_list:
item["title"] = node.xpath("./p[1]/a/text()").extract_first().strip()
item["link"] = response.urljoin(node.xpath("./p[1]/a/@href").extract_first().strip())
item["address"] = node.xpath("./p[2]/a[3]/text()").extract_first().strip()
item["big"] = node.xpath("./p[2]/text()[5]").extract_first().strip()
item["where"] = node.xpath("./p[2]/text()[6]").extract_first().strip()
item["how"] = node.xpath("./p[2]/text()[7]").extract_first().strip()
item["price"] = node.xpath(
'./span[@class="content__list--item-price"]/em/text()').extract_first().strip() + '元/月'
yield scrapy.Request(
url=item["link"],
callback=self.detail_parse,
meta={"item": copy.deepcopy(item)},
dont_filter=True
)
def detail_parse(self, response):
item = response.meta['item']
item["name"] = response.xpath('//*[@id="aside"]/div[2]/div[2]/div[1]/span/text()').extract_first()
print(item["title"])
yield item
因为翻页是动态加载的,我们就直接拼接下一页链接
第二页:https://jn.zu.ke.com/zufang/pg2/#contentList
第三页:https://jn.zu.ke.com/zufang/pg3/#contentList
发现变化的是pg后面的数字,构建代码:
if self.page < 100:
next_url = 'https://jn.zu.ke.com/zufang/pg{}/#contentList'.format(self.page)
self.page += 1
yield scrapy.Request(next_url, callback=self.parse)
交给scrapy框架进行请求解析,昨晚有一个bug一直困扰,就是解析列表页数据正常,但是解析详情页就出现了问题,最后打印数据是一样的,找了好久,然后通过百度找到了解决方法那就是导入copy模块,将列表的item传递使用深拷贝一下就好了meta={“item”: copy.deepcopy(item)},切记爬虫编写时,一定要注意对应好item字段,否则报错,注意一定要打开dont_fillter,不过滤,不打开了就会出现一个bug,当前页面会referer到上一页,数据一样就像这样
我们写完spider爬虫后,运行爬虫 scrapy crawl beike 查看效果:
下一步我们我们将数据保存csv,使用pipline管道,将数据写入
注意:一定要在setting文件中注册管道后面数值越小,越优先
全部代码:
爬虫item文件代码
# -*- coding: utf-8 -*-
# Define here the models for your scraped items
#
# See documentation in:
# https://docs.scrapy.org/en/latest/topics/items.html
import scrapy
class BeikeItem(scrapy.Item):
# define the fields for your item here like:
# name = scrapy.Field()
title = scrapy.Field()
link = scrapy.Field()
address = scrapy.Field()
big = scrapy.Field()
where = scrapy.Field()
how = scrapy.Field()
price = scrapy.Field()
name = scrapy.Field()
spider爬虫文件:
# -*- coding: utf-8 -*-
import scrapy
from Beike.items import BeikeItem
import copy
class BeikeSpider(scrapy.Spider):
name = 'beike'
allowed_domains = ['jn.zu.ke.com']
start_urls = ['https://jn.zu.ke.com/zufang']
page = 2
def parse(self, response):
print(response.url)
node_list = response.xpath('//div[@class="content__list--item--main"]')
print(len(node_list))
item = BeikeItem()
for node in node_list:
item["title"] = node.xpath("./p[1]/a/text()").extract_first().strip()
item["link"] = response.urljoin(node.xpath("./p[1]/a/@href").extract_first().strip())
item["address"] = node.xpath("./p[2]/a[3]/text()").extract_first().strip()
item["big"] = node.xpath("./p[2]/text()[5]").extract_first().strip()
item["where"] = node.xpath("./p[2]/text()[6]").extract_first().strip()
item["how"] = node.xpath("./p[2]/text()[7]").extract_first().strip()
item["price"] = node.xpath(
'./span[@class="content__list--item-price"]/em/text()').extract_first().strip() + '元/月'
yield scrapy.Request(
url=item["link"],
callback=self.detail_parse,
meta={"item": copy.deepcopy(item)},
dont_filter=True
)
if self.page < 100:
next_url = 'https://jn.zu.ke.com/zufang/pg{}/#contentList'.format(self.page)
self.page += 1
yield scrapy.Request(next_url, callback=self.parse)
def detail_parse(self, response):
item = response.meta['item']
item["name"] = response.xpath('//*[@id="aside"]/div[2]/div[2]/div[1]/span/text()').extract_first()
print(item["title"])
yield item
pipline代码
# -*- coding: utf-8 -*-
# Define your item pipelines here
#
# Don't forget to add your pipeline to the ITEM_PIPELINES setting
# See: https://docs.scrapy.org/en/latest/topics/item-pipeline.html
import csv
class SavePipeline(object):
def open_spider(self, spider):
self.file = open("贝壳.csv", 'a', newline="",encoding="gb18030")
self.csv_writer = csv.writer(self.file)
self.csv_writer.writerow(["标题", "链接", '地址', "大小", "方向", "居室",
"价格", "名字"])
def process_item(self, item, spider):
self.csv_writer.writerow(
[item["title"], item["link"], item["address"],
item["big"], item["where"], item["how"], item["price"], item["name"]]
)
return item
def close_spider(self, spider):
self.file.close()
setting文件
# -*- coding: utf-8 -*-
# Scrapy settings for Beike 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
BOT_NAME = 'Beike'
SPIDER_MODULES = ['Beike.spiders']
NEWSPIDER_MODULE = 'Beike.spiders'
# Crawl responsibly by identifying yourself (and your website) on the user-agent
USER_AGENT = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 ' \
'Safari/537.36 '
# Obey robots.txt rules
# ROBOTSTXT_OBEY = True
# 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 = {
# "Referer": "https://jn.zu.ke.com/zufang"
# }
# Enable or disable spider middlewares
# See https://docs.scrapy.org/en/latest/topics/spider-middleware.html
# SPIDER_MIDDLEWARES = {
# 'Beike.middlewares.BeikeSpiderMiddleware': 543,
# }
# Enable or disable downloader middlewares
# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
# DOWNLOADER_MIDDLEWARES = {
# 'Beike.middlewares.BeikeDownloaderMiddleware': 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 = {
'Beike.pipelines.SavePipeline': 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
# AUTOTHROTTLCONCURRENT_REQUESTSE_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'
整个代码实现比较简单,就是有坑,每个人主要就是从项目中积累经验吧,这个网站,没有反爬,也没cookie模拟登录,后续遇到反爬可以用一个请求头池,还有ip代理池,进行持续化抓取数据,以上都是个人学习经验,如有不正请指教,谢谢!