42.scrapy爬取数据入库mongodb

scrapy爬虫采集数据存入mongodb
采集效果如图：

1.首先开启服务
切换到mongodb的bin目录下   命令：mongod --dbpath e:\data\db

另开黑窗口  命令：mongo.exe

2.连接可视化工具 studio—3t  建立本地连接

如图： 

3.代码如下  采集的是玻璃网站产品数据   http://www.boliwang.com.cn/

boliwang.py

# -*- coding: utf-8 -*-
import scrapy
import re
from boliwang_web.items import BoliwangWebItem

class BoliwangSpider(scrapy.Spider):
    name = 'boliwang'
    allowed_domains = ['www.boliwang.com.cn']
    start_urls = ['http://www.boliwang.com.cn/gy/index-htm-page-1.html']
    custom_settings = {
        'DOWNLOAD_DELAY': 0.5,
        "DOWNLOADER_MIDDLEWARES": {
            'boliwang_web.middlewares.BoliwangWebDownloaderMiddleware': 500,
        },
    }
    def parse(self, response):
        # print(response.text)
        # 获取当前页面url
        link_urls = response.xpath("//table//tr/td[4]/ul/li[1]/a/@href").extract()

        for link_url in link_urls:
            # print(link_url)
            yield scrapy.Request(url=link_url, callback=self.parse_detail)
        # print('*'*100)
        #翻页
        tag = response.xpath("//div[@class='pages']/cite/text()").extract_first()
        # print(tag)
        p_num = tag.split('/')[1].replace('页','')
        # print(p_num)
        for i in range(1, int(p_num)+1):
            url = 'http://www.boliwang.com.cn/gy/index-htm-page-{}.html'.format(i)
            # print(url)
            yield scrapy.Request(url=url, callback=self.parse)

    def parse_detail(self, response):
        # 获取当前页面信息

        item = BoliwangWebItem()
        # 产品名称
        p_name = response.xpath("//table//tr[1]/td/h1[@id='title']/text()").extract_first()
        item['p_name'] = p_name
        # 品牌
        brand = response.xpath("//table//tr[2]/td[3]/table//tr[1]/td[2]/text()").extract_first()
        item['brand'] = brand
        # 单价
        price = response.xpath("//table//tr[2]/td[@class='f_b f_orange']/text()").extract_first()
        item['price'] = price
        # 起订
        set_up = response.xpath("//table//tr[3]/td[@class='f_b f_orange']/text()").extract_first()
        item['set_up'] = set_up
        # 供货总量
        summation = response.xpath("//table//tr[4]/td[@class='f_b f_orange']/text()").extract_first()
        item['summation'] = summation
        # 发货期限
        dispatch = response.xpath("//table//tr[5]/td[2]/span[@class='f_b f_orange']/text()").extract_first()
        dispatch = '{}'.format(dispatch)
        item['dispatch'] = dispatch
        # 所在地区
        dist = response.xpath("//table//tr[6]/td[2]/text()").extract_first()
        item['dist'] = dist
        # 有效期
        term_of_valid = response.xpath("//table//tr[7]/td[2]/text()").extract_first()
        item['term_of_valid'] = term_of_valid
        # 最后更新
        last_update = response.xpath("//table//tr[8]/td[2]/text()").extract_first()
        item['last_update'] = last_update
        # 详情信息
        content = response.xpath("//div[@class='box_body']/div[@id='content']").extract_first()
        item['content'] = content
        # 公司名称
        company = response.xpath("//li[@class='f_b t_c']/a/text()").extract_first()
        item['company'] = company
        # 联系人
        try:
            link_man = re.findall("<span>联系人</span>(.*?)&nbsp;&nbsp", response.text)
            link_man = link_man[0]
        except:
            link_man = ''
        item['link_man'] = link_man
        # 邮件
        try:
            email = re.findall('<li><span>邮件</span>(.*?)</li>', response.text)
            email = email[0]
        except:
            email = ''
        item['email'] = email
        # 电话
        try:
            tel = re.findall('<li><span>电话</span>(.*?)</li>', response.text)
            tel = tel[0]
        except:
            tel = ''
        item['tel'] = tel
        # 手机
        try :
            phone = re.findall('<li><span>手机</span>(.*?)</li>', response.text)
            phone = phone[0]
        except:
            phone = ''
        item['phone'] = phone
        # 公司地址
        try:
            c_dist = re.findall('<span>地址</span>(.*?)</li></ul>',response.text)
            c_dist = c_dist[0]
        except:
            c_dist = ''
        item['c_dist'] = c_dist

        yield item

        print('*'*100)

items.py

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

# Define here the models for your scraped items
#
# See documentation in:
# https://doc.scrapy.org/en/latest/topics/items.html

import scrapy

class BoliwangWebItem(scrapy.Item):
    # define the fields for your item here like:
    # name = scrapy.Field()

    collection = table = 'products'

    # 产品名称
    p_name = scrapy.Field()
    # 品牌
    brand = scrapy.Field()
    # 单价
    price = scrapy.Field()
    # 起订
    set_up = scrapy.Field()
    # 供货总量
    summation = scrapy.Field()
    # 发货期限
    dispatch = scrapy.Field()
    # 所在地区
    dist = scrapy.Field()
    # 有效期
    term_of_valid = scrapy.Field()
    # 最后更新
    last_update = scrapy.Field()
    # 详情信息
    content = scrapy.Field()
    # 公司名称
    company = scrapy.Field()
    # 联系人
    link_man = scrapy.Field()
    # 邮件
    email = scrapy.Field()
    # 电话
    tel = scrapy.Field()
    # 手机
    phone = scrapy.Field()
    # 公司地址
    c_dist = scrapy.Field()

items.py

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

# Define here the models for your spider middleware
#
# See documentation in:
# https://doc.scrapy.org/en/latest/topics/spider-middleware.html

from scrapy import signals

class BoliwangWebSpiderMiddleware(object):
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the spider middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_spider_input(self, response, spider):
        # Called for each response that goes through the spider
        # middleware and into the spider.

        # Should return None or raise an exception.
        return None

    def process_spider_output(self, response, result, spider):
        # Called with the results returned from the Spider, after
        # it has processed the response.

        # Must return an iterable of Request, dict or Item objects.
        for i in result:
            yield i

    def process_spider_exception(self, response, exception, spider):
        # Called when a spider or process_spider_input() method
        # (from other spider middleware) raises an exception.

        # Should return either None or an iterable of Response, dict
        # or Item objects.
        pass

    def process_start_requests(self, start_requests, spider):
        # Called with the start requests of the spider, and works
        # similarly to the process_spider_output() method, except
        # that it doesn’t have a response associated.

        # Must return only requests (not items).
        for r in start_requests:
            yield r

    def spider_opened(self, spider):
        spider.logger.info('Spider opened: %s' % spider.name)

class BoliwangWebDownloaderMiddleware(object):
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the downloader middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_request(self, request, spider):
        # Called for each request that goes through the downloader
        # middleware.

        # Must either:
        # - return None: continue processing this request
        # - or return a Response object
        # - or return a Request object
        # - or raise IgnoreRequest: process_exception() methods of
        #   installed downloader middleware will be called
        return None

    def process_response(self, request, response, spider):
        # Called with the response returned from the downloader.

        # Must either;
        # - return a Response object
        # - return a Request object
        # - or raise IgnoreRequest
        return response

    def process_exception(self, request, exception, spider):
        # Called when a download handler or a process_request()
        # (from other downloader middleware) raises an exception.

        # Must either:
        # - return None: continue processing this exception
        # - return a Response object: stops process_exception() chain
        # - return a Request object: stops process_exception() chain
        pass

    def spider_opened(self, spider):
        spider.logger.info('Spider opened: %s' % spider.name)

piplines.py

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

# 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 pymongo

class BoliwangWebPipeline(object):
    def process_item(self, item, spider):
        return item

class MongoPipeline(object):
    def __init__(self, mongo_uri, mongo_db):
        self.mongo_uri = mongo_uri
        self.mongo_db = mongo_db

    @classmethod
    def from_crawler(cls, crawler):
        return cls(mongo_uri=crawler.settings.get('MONGO_URI'), mongo_db=crawler.settings.get('MONGO_DB'))

    def open_spider(self, spider):
        self.client = pymongo.MongoClient(self.mongo_uri)
        self.db = self.client[self.mongo_db]

    def process_item(self, item, spider):
        self.db[item.collection].insert(dict(item))
        return item

    def close_spider(self, spider):
        self.client.close()

settinngs.py

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

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

BOT_NAME = 'boliwang_web'

SPIDER_MODULES = ['boliwang_web.spiders']
NEWSPIDER_MODULE = 'boliwang_web.spiders'

# Crawl responsibly by identifying yourself (and your website) on the user-agent
#USER_AGENT = 'boliwang_web (+http://www.yourdomain.com)'

# Obey robots.txt rules
ROBOTSTXT_OBEY = False

MONGO_HOST = "localhost"
MONGO_PORT = 27017
MONGO_DB = 'boliwang'

# 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://doc.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://doc.scrapy.org/en/latest/topics/spider-middleware.html
#SPIDER_MIDDLEWARES = {
#    'boliwang_web.middlewares.BoliwangWebSpiderMiddleware': 543,
#}

# Enable or disable downloader middlewares
# See https://doc.scrapy.org/en/latest/topics/downloader-middleware.html
DOWNLOADER_MIDDLEWARES = {
   'boliwang_web.middlewares.BoliwangWebDownloaderMiddleware': 543,
}

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

# Configure item pipelines
# See https://doc.scrapy.org/en/latest/topics/item-pipeline.html
ITEM_PIPELINES = {
   'boliwang_web.pipelines.MongoPipeline': 300,
}

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