本文實(shí)例講述了Python使用scrapy采集數(shù)據(jù)過程中放回下載過大頁面的方法。分享給大家供大家參考。具體分析如下：
添加以下代碼到settings.py，myproject為你的項(xiàng)目名稱
復(fù)制代碼 代碼如下:
DOWNLOADER_HTTPCLIENTFACTORY = 'myproject.downloader.LimitSizeHTTPClientFactory'
自定義限制下載過大頁面的模塊
復(fù)制代碼 代碼如下:
MAX_RESPONSE_SIZE = 1048576 # 1Mb
from scrapy.core.downloader.webclient import ScrapyHTTPClientFactory, ScrapyHTTPPageGetter
class LimitSizePageGetter(ScrapyHTTPPageGetter):
def handleHeader(self, key, value):
ScrapyHTTPPageGetter.handleHeader(self, key, value)
if key.lower() == 'content-length' and int(value) > MAX_RESPONSE_SIZE:
self.connectionLost('oversized')
class LimitSizeHTTPClientFactory(ScrapyHTTPClientFactory):
protocol = LimitSizePageGetter
from scrapy.core.downloader.webclient import ScrapyHTTPClientFactory, ScrapyHTTPPageGetter
class LimitSizePageGetter(ScrapyHTTPPageGetter):
def handleHeader(self, key, value):
ScrapyHTTPPageGetter.handleHeader(self, key, value)
if key.lower() == 'content-length' and int(value) > MAX_RESPONSE_SIZE:
self.connectionLost('oversized')
class LimitSizeHTTPClientFactory(ScrapyHTTPClientFactory):
protocol = LimitSizePageGetter
希望本文所述對大家的Python程序設(shè)計(jì)有所幫助。
