爬蟲——Scrapy框架案例二：陽光問政平臺
阿新 • • 發佈：2017-08-01
web url地址 blog rem idt xpath disable ora ole
/* */").extract()[1]
# 部門
sector = td2.xpath("./a/text()").extract()[2]
td3 = tr.xpath("./td")[2]
# 狀態
post_state = td3.xpath("./span/text()").extract()[0]
# 網友
net_friend = tr.xpath("./td/text()").extract()[3]
# 時間
post_time = tr.xpath("./td/text()").extract()[4]
item["post_id"] = post_id
item["post_type"] = post_type
item["post_title"] = post_title
item["post_url"] = post_url
item["sector"] = sector
item["post_state"] = post_state
item["net_friend"] = net_friend
item["post_time"] = post_time
yield item
except:
pass
# 判斷是否繼續爬取下一頁
if next_flag:
self.offset += 30
yield scrapy.Request(self.url + str(self.offset), callback = self.parse)
陽光熱線問政平臺
URL地址：http://wz.sun0769.com/index.php/question/questionType?type=4&page=
爬取字段：帖子的編號、投訴類型、帖子的標題、帖子的URL地址、部門、狀態、網友、時間。
1.items.py
# -*- coding: utf-8 -*-
# Define here the models for your scraped items
#
# See documentation in:
# http://doc.scrapy.org/en/latest/topics/items.html
import scrapy
class SunwzspiderItem(scrapy.Item):
# define the fields for your item here like:
# 爬取投訴帖子的編號、投訴類型、帖子的標題、帖子的URL、部門、狀態、網友、時間。
# 帖子的編號
post_id = scrapy.Field()
# 投訴類型
post_type = scrapy.Field()
# 帖子的標題
post_title = scrapy.Field()
# 帖子的URL
post_url = scrapy.Field()
# 部門
sector = scrapy.Field()
# 狀態
post_state = scrapy.Field()
# 網友
net_friend = scrapy.Field()
# 時間
post_time = scrapy.Field()
2.spiders/sunwz.py
# -*- coding: utf-8 -*-
import scrapy
from sunwzSpider.items import SunwzspiderItem
class SunwzSpider(scrapy.Spider):
name = ‘sunwz‘
allowed_domains = [‘wz.sun0769.com‘]
url = "http://wz.sun0769.com/index.php/question/questionType?type=4&page="
offset = 0
start_urls = [url + str(offset)]
def parse(self, response):
table = response.xpath("//table[@width=‘98%‘]")[0]
trs = table.xpath("./tr")
# 是否爬取下一頁的標記
next_flag = False
for tr in trs:
next_flag = True
try:
item = SunwzspiderItem()
# 帖子的編號
post_id = tr.xpath("./td/text()").extract()[0]
td2 = tr.xpath("./td")[1]
# 投訴類型
post_type = td2.xpath("./a/text()").extract()[0]
# 帖子的標題
post_title = td2.xpath("./a/text()").extract()[1]
# 帖子的URL
post_url = td2.xpath(".[email protected]3.pipelines.py
# -*- coding: utf-8 -*-
# Define your item pipelines here
#
# Don‘t forget to add your pipeline to the ITEM_PIPELINES setting
# See: http://doc.scrapy.org/en/latest/topics/item-pipeline.html
import json
class SunwzspiderPipeline(object):
def __init__(self):
self.file = open("陽光問政平臺.json", "w", encoding = "utf-8")
self.first_flag = True
def process_item(self, item, spider):
if self.first_flag:
self.first_flag = False
content = "[\n" + json.dumps(dict(item), ensure_ascii = False)
else:
content = ",\n" + json.dumps(dict(item), ensure_ascii = False)
self.file.write(content)
return item
def close_spider(self, spider):
self.file.write("\n]")
self.file.close()
4.settings.py
# -*- coding: utf-8 -*-
# Scrapy settings for sunwzSpider 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
BOT_NAME = ‘sunwzSpider‘
SPIDER_MODULES = [‘sunwzSpider.spiders‘]
NEWSPIDER_MODULE = ‘sunwzSpider.spiders‘
# Crawl responsibly by identifying yourself (and your website) on the user-agent
#USER_AGENT = ‘sunwzSpider (+http://www.yourdomain.com)‘
# 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 http://scrapy.readthedocs.org/en/latest/topics/settings.html#download-delay
# See also autothrottle settings and docs
DOWNLOAD_DELAY = 2
# 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‘,
‘User-Agent‘: ‘Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.71 Safari/537.36‘
# ‘Accept-Language‘: ‘en‘,
}
# Enable or disable spider middlewares
# See http://scrapy.readthedocs.org/en/latest/topics/spider-middleware.html
#SPIDER_MIDDLEWARES = {
# ‘sunwzSpider.middlewares.SunwzspiderSpiderMiddleware‘: 543,
#}
# Enable or disable downloader middlewares
# See http://scrapy.readthedocs.org/en/latest/topics/downloader-middleware.html
#DOWNLOADER_MIDDLEWARES = {
# ‘sunwzSpider.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 = {
‘sunwzSpider.pipelines.SunwzspiderPipeline‘: 300,
}
# 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‘
爬蟲——Scrapy框架案例二：陽光問政平臺