作业①:
- 要求:指定一个网站,爬取这个网站中的所有的所有图片,例如:中国气象网(http://www.weather.com.cn)。使用scrapy框架分别实现单线程和多线程的方式爬取。
务必控制总页数(学号尾数2位)、总下载的图片数量(尾数后3位)等限制爬取的措施。
输出信息: 将下载的Url信息在控制台输出,并将下载的图片存储在images子文件中,并给出截图。
-
关键代码
from scrapy import signals
from itemadapter import is_item, ItemAdapter
class W0SpiderMiddleware:
@classmethod
def from_crawler(cls, crawler):
s = cls()
crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
return s
def process_spider_input(self, response, spider):
return None
def process_spider_output(self, response, result, spider):
for i in result:
yield i
def process_spider_exception(self, response, exception, spider):
pass
def process_start_requests(self, start_requests, spider):
for r in start_requests:
yield r
def spider_opened(self, spider):
spider.logger.info("Spider opened: %s" % spider.name)
class W0DownloaderMiddleware:
@classmethod
def from_crawler(cls, crawler):
s = cls()
crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
return s
def process_request(self, request, spider):
return None
def process_response(self, request, response, spider):
return response
def process_exception(self, request, exception, spider):
pass
def spider_opened(self, spider):
spider.logger.info("Spider opened: %s" % spider.name)
![](https://img2023.cnblogs.com/blog/3286720/202311/3286720-20231102015910960-1262508638.jpg)
-
心得体会
学会了用crapy框架实现单线程和多线程
作业②:
- 要求:熟练掌握 scrapy 中 Item、Pipeline 数据的序列化输出方法;使用scrapy框架+Xpath+MySQL数据库存储技术路线爬取股票相关信息。
候选网站:东方财富网:https://www.eastmoney.com/
输出信息:MySQL数据库存储和输出格式如下:
表头英文命名例如:序号id,股票代码:bStockNo……,由同学们自行定义设计
-
关键代码
from scrapy import signals
from itemadapter import is_item, ItemAdapter
class W1SpiderMiddleware:
@classmethod
def from_crawler(cls, crawler):
s = cls()
crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
return s
def process_spider_input(self, response, spider):
return None
def process_spider_output(self, response, result, spider):
for i in result:
yield i
def process_spider_exception(self, response, exception, spider):
pass
def process_start_requests(self, start_requests, spider):
for r in start_requests:
yield r
def spider_opened(self, spider):
spider.logger.info("Spider opened: %s" % spider.name)
class W1DownloaderMiddleware:
@classmethod
def from_crawler(cls, crawler):
s = cls()
crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
return s
def process_request(self, request, spider):
return None
def process_response(self, request, response, spider):
return response
def process_exception(self, request, exception, spider):
pass
def spider_opened(self, spider):
spider.logger.info("Spider opened: %s" % spider.name)
![](https://img2023.cnblogs.com/blog/3286720/202311/3286720-20231102020404937-2103527934.jpg)
作业③:
from scrapy import signals
from itemadapter import is_item, ItemAdapter
class W2SpiderMiddleware:
@classmethod
def from_crawler(cls, crawler):
s = cls()
crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
return s
def process_spider_input(self, response, spider):
return None
def process_spider_output(self, response, result, spider):
for i in result:
yield i
def process_spider_exception(self, response, exception, spider):
pass
def process_start_requests(self, start_requests, spider):
for r in start_requests:
yield r
def spider_opened(self, spider):
spider.logger.info("Spider opened: %s" % spider.name)
class W2DownloaderMiddleware:
@classmethod
def from_crawler(cls, crawler):
s = cls()
crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
return s
def process_request(self, request, spider):
return None
def process_response(self, request, response, spider):
return response
def process_exception(self, request, exception, spider):
pass
def spider_opened(self, spider):
spider.logger.info("Spider opened: %s" % spider.name)
![](https://img2023.cnblogs.com/blog/3286720/202311/3286720-20231102020734644-2108044507.jpg)
-
心得体会
熟练掌握了scrapy中Item和Pipeline的方法