scrapy之360图片爬取

#今日目标

**scrapy之360图片爬取**

今天要爬取的是360美女图片，首先分析页面得知网页是动态加载，故需要先找到网页链接规律，
然后调用ImagesPipeline类实现图片爬取

*代码实现*
so.py 
```
# -*- coding: utf-8 -*-
import scrapy
import json
from ..items import SoItem

class SoSpider(scrapy.Spider):
    name = 'so'
    allowed_domains = ['imaeg.os.com']

    # 重写
    def start_requests(self):
        url = 'http://image.so.com/zjl?ch=beauty&sn={}&listtype=new&temp=1'
        # 生成5页的地址,交给调度器
        for i in range(5):
            sn = i*30
            full_url = url.format(sn)
            yield scrapy.Request(
                url = full_url,
                callback = self.parse_image,
                dont_filter=False
            )

    def parse_image(self,response):
        html = json.loads(response.text)
        # 提取图片链接
        for img in html['list']:
            item = SoItem()
            item['img_link'] = img['qhimg_url']

            yield item
```

item.py
```
import scrapy
class SoItem(scrapy.Item):
    # define the fields for your item here like:
    # 图片链接
    img_link = scrapy.Field()
```
pipelines.py
```
# 导入scrapy的图片管道类
from scrapy.pipelines.images import ImagesPipeline
import scrapy

# 1. 继承 ImagesPipeline
# 2. 重写 类内方法
class SoPipeline(ImagesPipeline):
    def get_media_requests(self, item, info):
        # 把图片链接发给调度器
        yield scrapy.Request(url = item['img_link'],dont_filter=False)
```

settings.py
```
# Obey robots.txt rules
ROBOTSTXT_OBEY = False

CONCURRENT_REQUESTS = 10


DEFAULT_REQUEST_HEADERS = {
  'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
  'Accept-Language': 'en',
  'User-Agent':'Mozilla/5.0',
}

ITEM_PIPELINES = {
   'So.pipelines.SoPipeline': 300,
}
IMAGES_STORE = '/home/ccc/image/' #个人保存路径

```