在前面的章节中都介绍了scrapy如何爬取网页数据,今天介绍下如何爬取图片。

下载图片需要用到ImagesPipeline这个类,首先介绍下工作流程:

1 首先需要在一个爬虫中,获取到图片的url并存储起来。也是就是我们项目中test_spider.py中testSpider类的功能

2 项目从爬虫返回,进入到项目通道也就是pipelines中

3 在通道中,在第一步中获取到的图片url将被scrapy的调度器和下载器安排下载。

4 下载完成后,将返回一组列表,包括下载路径,源抓取地址和图片的校验码

大致的过程就以上4步,那么我们来看下代码如何具体实现

1 首先在settings.py中设置下载通道,下载路径以下载参数

ITEM_PIPELINES = {

#    'test1.pipelines.Test1Pipeline': 300,

'scrapy.pipelines.images.ImagesPipeline':1,

}

IMAGES_STORE ='E:\\scrapy_project\\test1\\image'

IMAGES_EXPIRES = 90

IMAGES_MIN_HEIGHT = 100

IMAGES_MIN_WIDTH = 100

其中IMAGES_STORE是设置的是图片保存的路径。IMAGES_EXPIRES是设置的项目保存的最长时间。IMAGES_MIN_HEIGHT和IMAGES_MIN_WIDTH是设置的图片尺寸大小

2 设置完成后,我们就开始写爬虫程序,也就是第一步获取到图片的URL。我们以http://699pic.com/people.html网站图片为例。中文名称为摄图网。里面有各种摄影图片。我们首先来看下网页结构。图片的地址都保存在

<div class=“swipeboxex”><div class=”list”><a><image>中的属性data-original

首先在item.py中定义如下几个结构体

根据这个网页结构,在test_spider.py文件中的代码如下。在items中保存了

3 在第二步中获取到了图片url后,下面就要进入pipeline管道。进入pipeline.py。首先引入ImagesPipeline

from scrapy.pipelines.imagesimport ImagesPipeline

然后只需要将Test1Pipeline继承自ImagesPipeline就可以了。里面可以不用写任意代码

class Test1Pipeline(ImagesPipeline):

pass

ImagesPipeline中主要介绍2个函数。get_media_requests和item_completed.我们来看下代码的实现:

def get_media_requests(self, item, info):

return [Request(x)for xin item.get(self.images_urls_field, [])]

从代码中可以看到get_meida)_requests是从管道中取出图片的url并调用request函数去获取这个url

Item_completed函数

def item_completed(self, results, item, info):

if isinstance(item,dict)or self.images_result_fieldin item.fields:

item[self.images_result_field] = [xfor ok, xin resultsif ok]

return item

当下载完了图片后,将图片的路径以及网址,校验码保存在item中

下面运行代码,这里贴出log中的运行日志:

2017-06-09 22:38:17 [scrapy] INFO: Scrapy 1.1.0 started (bot: test1)

2017-06-09 22:38:17 [scrapy] INFO: Overridden settings: {'NEWSPIDER_MODULE': 'test1.spiders', 'IMAGES_MIN_HEIGHT': 100, 'SPIDER_MODULES': ['test1.spiders'], 'BOT_NAME': 'test1', 'USER_AGENT': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36', 'LOG_FILE': 'log', 'IMAGES_MIN_WIDTH': 100}

2017-06-09 22:38:18 [scrapy] INFO: Enabled extensions:

['scrapy.extensions.logstats.LogStats',

'scrapy.extensions.telnet.TelnetConsole',

'scrapy.extensions.corestats.CoreStats']

2017-06-09 22:38:18 [scrapy] INFO: Enabled downloader middlewares:

['scrapy.downloadermiddlewares.httpauth.HttpAuthMiddleware',

'scrapy.downloadermiddlewares.downloadtimeout.DownloadTimeoutMiddleware',

'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware',

'scrapy.downloadermiddlewares.retry.RetryMiddleware',

'scrapy.downloadermiddlewares.defaultheaders.DefaultHeadersMiddleware',

'scrapy.downloadermiddlewares.redirect.MetaRefreshMiddleware',

'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware',

'scrapy.downloadermiddlewares.redirect.RedirectMiddleware',

'scrapy.downloadermiddlewares.cookies.CookiesMiddleware',

'scrapy.downloadermiddlewares.chunked.ChunkedTransferMiddleware',

'scrapy.downloadermiddlewares.stats.DownloaderStats']

2017-06-09 22:38:18 [scrapy] INFO: Enabled spider middlewares:

['scrapy.spidermiddlewares.httperror.HttpErrorMiddleware',

'scrapy.spidermiddlewares.offsite.OffsiteMiddleware',

'scrapy.spidermiddlewares.referer.RefererMiddleware',

'scrapy.spidermiddlewares.urllength.UrlLengthMiddleware',

'scrapy.spidermiddlewares.depth.DepthMiddleware']

2017-06-09 22:38:19 [scrapy] INFO: Enabled item pipelines:

['scrapy.pipelines.images.ImagesPipeline']

2017-06-09 22:38:19 [scrapy] INFO: Spider opened

2017-06-09 22:38:19 [scrapy] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)

2017-06-09 22:38:19 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:6023

2017-06-09 22:38:19 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:19 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:19 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Crawled (200) (referer: None)

2017-06-09 22:38:20 [scrapy] DEBUG: File (downloaded): Downloaded file from referred in

2017-06-09 22:38:20 [scrapy] DEBUG: Scraped from <200 http://699pic.com/people.html>

{'image_urls': [u'http://img95.699pic.com/photo/50004/2199.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/00002/3435.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/00038/9869.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/00029/2430.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/00037/9614.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/50002/2276.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/00045/2871.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/00015/5234.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/00021/8332.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/00043/3285.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/50001/6744.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/50001/1769.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/00031/3314.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/50006/3243.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/50000/4373.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/00013/4480.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/00002/9278.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/00017/0701.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/00022/2328.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/00019/6796.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/00004/4944.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/50016/6025.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/00002/3437.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/00014/2406.jpg_wh300.jpg',

u'http://img95.699pic.com/photo/00007/4890.jpg_wh300.jpg'],

'images': [{'checksum': '09d39902660ad2e047d721f53e7a2019',

'path': 'full/eb33d8812b7a06fbef2f57b87acca8cbd3a1d82b.jpg',

'url': 'http://img95.699pic.com/photo/50004/2199.jpg_wh300.jpg'},

{'checksum': 'dc87cfe3f9a3ee2728af253ebb686d2d',

'path': 'full/63334914ac8fc79f8a37a5f3bd7c06abeffac2a8.jpg',

'url': 'http://img95.699pic.com/photo/00002/3435.jpg_wh300.jpg'},

{'checksum': 'b19e55369fa0a5061f48fe997b0085e5',

'path': 'full/4f06b529a4a5fd752339fc120a1bcf89a7125da0.jpg',

'url': 'http://img95.699pic.com/photo/00038/9869.jpg_wh300.jpg'},

{'checksum': '786e0cfacf113d00302794c5fda7e93f',

'path': 'full/9540903ee92ec44d59916b4a5ebcbcec32e50a67.jpg',

'url': 'http://img95.699pic.com/photo/00029/2430.jpg_wh300.jpg'},

{'checksum': 'c4266a539b046c1b8f66609b3fef36e2',

'path': 'full/ea9bda3236f78ac319b02add631d7a713535c8d0.jpg',

'url': 'http://img95.699pic.com/photo/00037/9614.jpg_wh300.jpg'},

{'checksum': '0b4d75bb3289a2bda05dac84bfee3591',

'path': 'full/1831779855e3767e547653a823a4c986869bb6df.jpg',

'url': 'http://img95.699pic.com/photo/50002/2276.jpg_wh300.jpg'},

{'checksum': '0c7b9e849acf00646ef06ae4ade0a024',

'path': 'full/cac4915246f820035198c014a770c80cb078300b.jpg',

'url': 'http://img95.699pic.com/photo/00045/2871.jpg_wh300.jpg'},

{'checksum': '4482da90e8b468e947cd2872661c6cac',

'path': 'full/118dc882386112ab593e86743222200bedb8752a.jpg',

'url': 'http://img95.699pic.com/photo/00015/5234.jpg_wh300.jpg'},

{'checksum': '12b8d957b3a1fd7a29baf41c06b17105',

'path': 'full/ac2e45ed2716678a5045866a65d86e304e97e8ad.jpg',

'url': 'http://img95.699pic.com/photo/00021/8332.jpg_wh300.jpg'},

{'checksum': '44275a83945dfe4953ecc82c7105b869',

'path': 'full/b0ec1a2775ec55931e133c46e9f1d8680bea39e6.jpg',

'url': 'http://img95.699pic.com/photo/00043/3285.jpg_wh300.jpg'},

{'checksum': 'e960e51ebbc4ac7bd12c974ca8a33759',

'path': 'full/5f2a293333ea3f1fd3c63b7d56a9f82e1d9ff4d8.jpg',

'url': 'http://img95.699pic.com/photo/50001/6744.jpg_wh300.jpg'},

{'checksum': '08acf086571823fa739ba1b0aa5c99f3',

'path': 'full/70b24f8e7e1c4b4d7e3fe7cd6056b1ac4904f92e.jpg',

'url': 'http://img95.699pic.com/photo/50001/1769.jpg_wh300.jpg'},

{'checksum': '2599ccd44c640948e5331688420ec8af',

'path': 'full/a20b9c4eaf12a56e8b5506cc2a27d28f3e436595.jpg',

'url': 'http://img95.699pic.com/photo/00031/3314.jpg_wh300.jpg'},

{'checksum': '39bcb67a642f1cc9776be934df292f59',

'path': 'full/8b3d1eee34fb752c5b293252b10f8d9793f05240.jpg',

'url': 'http://img95.699pic.com/photo/50006/3243.jpg_wh300.jpg'},

{'checksum': 'd2e554d618de6d53ffd76812bf135edf',

'path': 'full/907c628df31bf6d6f2077b5f7fd37f02ea570634.jpg',

'url': 'http://img95.699pic.com/photo/50000/4373.jpg_wh300.jpg'},

{'checksum': '6fc5c1783080cee030858b9abb5ff6a5',

'path': 'full/f42a1cca0f7ec657aa66eca9a751a0c4d8defbb1.jpg',

'url': 'http://img95.699pic.com/photo/00013/4480.jpg_wh300.jpg'},

{'checksum': '906d1b79cec6ac8a0435b2c5c9517b4a',

'path': 'full/35853ef411058171381dc65e7e2c824a86caecbe.jpg',

'url': 'http://img95.699pic.com/photo/00002/9278.jpg_wh300.jpg'},

{'checksum': '3119eca5ffdf5c0bb2984d7c6dc967c0',

'path': 'full/b294005510b8159f7508c5f084a5e0dbbfb63fbe.jpg',

'url': 'http://img95.699pic.com/photo/00017/0701.jpg_wh300.jpg'},

{'checksum': '7ce71cece48dcf95b86e0e5afce9985d',

'path': 'full/035017aa993bb72f495a7014403bd558f1883430.jpg',

'url': 'http://img95.699pic.com/photo/00022/2328.jpg_wh300.jpg'},

{'checksum': 'ac1d9a9569353ed92baddcedd9a0d787',

'path': 'full/71038a4d15c0e5613831d49d7a6d5901d40426ac.jpg',

'url': 'http://img95.699pic.com/photo/00019/6796.jpg_wh300.jpg'},

{'checksum': 'ad1732345aeb5534cb77bd5d9cffd847',

'path': 'full/c01104e93ed52a3d62c6a5edb2970281b2d0902b.jpg',

'url': 'http://img95.699pic.com/photo/00004/4944.jpg_wh300.jpg'},

{'checksum': 'c3c216d12719b5c00df3a85baef90aff',

'path': 'full/1470a42ad964c97867459645b14adc73c870f0e1.jpg',

'url': 'http://img95.699pic.com/photo/50016/6025.jpg_wh300.jpg'},

{'checksum': '74c37b5a6e417ecfa7151683b178e2b3',

'path': 'full/821cea60c4ee6b388b5245c6cc7e5aa5d07dacb5.jpg',

'url': 'http://img95.699pic.com/photo/00002/3437.jpg_wh300.jpg'},

{'checksum': 'f991181e76a5017769140756097b18f5',

'path': 'full/a8aa882e28f0704dd0c32d783df860f8b5617b45.jpg',

'url': 'http://img95.699pic.com/photo/00014/2406.jpg_wh300.jpg'},

{'checksum': '0878fe7552a6c1c5cfbd45ae151891c8',

'path': 'full/9c147ed85db3823b1072a761e30e8f2a517e7af0.jpg',

'url': 'http://img95.699pic.com/photo/00007/4890.jpg_wh300.jpg'}]}

2017-06-09 22:38:20 [scrapy] INFO: Closing spider (finished)

2017-06-09 22:38:20 [scrapy] INFO: Dumping Scrapy stats:

{'downloader/request_bytes': 10145,

'downloader/request_count': 26,

'downloader/request_method_count/GET': 26,

'downloader/response_bytes': 1612150,

'downloader/response_count': 26,

'downloader/response_status_count/200': 26,

'file_count': 25,

'file_status_count/downloaded': 25,

'finish_reason': 'finished',

'finish_time': datetime.datetime(2017, 6, 9, 14, 38, 20, 962000),

'item_scraped_count': 1,

'log_count/DEBUG': 53,

'log_count/INFO': 7,

'response_received_count': 26,

'scheduler/dequeued': 1,

'scheduler/dequeued/memory': 1,

'scheduler/enqueued': 1,

'scheduler/enqueued/memory': 1,

'start_time': datetime.datetime(2017, 6, 9, 14, 38, 19, 382000)}

2017-06-09 22:38:20 [scrapy] INFO: Spider closed (finished)

从log日志中可以看到image_urls和images中分别保存了图片URL以及返回的路径。比如下面的这个例子。Jpg图片保存在full文件夹下面

full/1470a42ad964c97867459645b14adc73c870f0e1.jpg

结合之前设置的IMAGES_STORE的值,图片的完整路径应该是在E:\scrapy_project\test1\image\full。在这个路径下可以看到下载完成的图片

根据scrapy的官方文档,get_media_requests和item_completed也可以自己重写,代码如下,和系统自带的代码差不多是一样的

class Test1Pipeline(ImagesPipeline):

def get_media_requests(self,item,info):

for image_urlin item['image_urls']:

yield Request(image_url)

def item_completed(self, results, item, info):

image_path=[x['path']for ok,xin resultsif ok]

print image_path

if not image_path:

raise DropItem('items contains no images')

item['image_paths']=image_path

return item

首先在get_media_requests对每个图片的路径进行请求,并对各个URL图片返回一个Request,这些请求被管道处理,当它们下载完成后。结果以元组列表的形式返回到item_completed

Success 是一个布尔值,当成功下载是为True,失败为False

Image_infor_or_error 是一个包含下列关键字的字典(如果成功为True,失败为Twisted Failure)

url:图片下载的url,就是从get_media_requests中返回请求的URL

path:图片存储的路径。就像full/1ca5879492b8fd606df1964ea3c1e2f4520f076f.jpg这种格式的

checksum:图片内容的MD5 hash

item_completed需要返回一个输出,将其送到随后的项目管道阶段。因此我们将下载图片的路径存储在image_path中并返回

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