创建项目
scrapy startproject youyaoqi
进入文件夹内建立爬虫
scrapy genspider yaoqi u17.com

yaoqi.py文件中

# -*- coding: utf-8 -*-
import scrapy
import json
from youyaoqi.items import YouyaoqiItem


class YaoqiSpider(scrapy.Spider):
    name = 'yaoqi'
    allowed_domains = ['u17.com']
    start_urls = ['http://www.u17.com/comic_list/th99_gr99_ca99_ss99_ob0_ac0_as0_wm0_co99_ct99_p1.html?order=2']

    def start_requests(self):
        data = {'data[group_id]': 'no', 'data[theme_id]': 'no', 'data[is_vip]': 'no', 'data[accredit]': 'no',
                'data[color]': 'no',
                'data[comic_type]': 'no',
                'data[series_status]': 'no',
                'data[order]': '2',
                'data[page_num]': '1',
                'data[read_mode]': 'no',
                }
        url = 'http://www.u17.com/comic/ajax.php?mod=comic_list&act=comic_list_new_fun&a=get_comic_list'
        headers = {
            'Referer': url,
            'User-Agent': 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; 360SE)',
            'Accept': 'application/json, text/plain, */*',
            'Accept-Encoding': 'gzip, deflate, sdch',
            'Accept-Language': 'zh-CN,zh;q=0.8,en;q=0.6,ja;q=0.4,zh-TW;q=0.2,mt;q=0.2',
            'Connection': 'keep-alive',
            'X-Requested-With': 'XMLHttpRequest',
            'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8',
        }
        for i in range(409):
            data['data[page_num]'] = '%d' % (i+1)
            yield scrapy.FormRequest(
                url=url,
                headers=headers,
                method='POST',
                formdata=data,
                callback=self.parse,
            )

    def parse(self, response):
        json_result = json.loads(response.text)
        comic_list = json_result['comic_list']
        for comic in comic_list:
            item = YouyaoqiItem()
            item['comic_id'] = comic['comic_id']
            item['name'] = comic['name']
            item['cover'] = comic['cover']
            item['category'] = comic['line2']
            yield item

在items.py文件中

# https://doc.scrapy.org/en/latest/topics/items.html

import scrapy


class YouyaoqiItem(scrapy.Item):
    # define the fields for your item here like:
    comic_id = scrapy.Field()
    name = scrapy.Field()
    cover = scrapy.Field()
    category = scrapy.Field()

在settings.py文件中

把ROBOTSTXT_OBEY = True改为False
配置中文
FEED_EXPORT_ENCODING = 'utf-8'
执行命令
scrapy crawl yaoqi reslut.json
把数据保存进reslut.json文件中

保存数据进数据库---mysql
在settings.py文件中配置mysql

MYSQL_HOST = '127.0.0.1'
MYSQL_DATABASE = 'u17'
MYSQL_PORT = 3306
MYSQL_USER = 'root'
MYSQL_PASSWORD = '123456'

在pipelines.py文件中

class U17MysqlPipeline(object):

    def __init__(self, host, database, user, password, port):
        self.host = host
        self.database = database
        self.user = user
        self.password = password
        self.port = port

    @classmethod
    def from_crawler(cls, crawler):
        return cls(
            host=crawler.settings.get("MYSQL_HOST"),
            database=crawler.settings.get("MYSQL_DATABASE"),
            user=crawler.settings.get("MYSQL_USER"),
            password=crawler.settings.get("MYSQL_PASSWORD"),
            port=crawler.settings.get("MYSQL_PORT"),
        )

    def open_spider(self, spider):
        self.db = pymysql.connect(self.host, self.user, self.password, self.database, charset='utf8', port=self.port)
        self.cursor = self.db.cursor()

    def close_spider(self, spider):
        self.db.close()

    def process_item(self, item, spider):
        sql = 'insert into yaoqi (comic_id, name, cover, category) values ("%s", "%s", "%s", "%s")' % (
        item['comic_id'], item['name'], item['cover'], item['category'])
        print(sql)
        self.cursor.execute(sql)
        self.db.commit()

        return item

在settings.py文件中配置

ITEM_PIPELINES = {
'youyaoqi.pipelines.U17MysqlPipeline': 300,]

保存图片
在settings.py文件中配置图片路径

IMAGES_STORE = './images'

在pipelines.py文件中

class U17ImagePipeline(ImagesPipeline):

    def file_path(self, request, response=None, info=None):
        url = request.url
        file_name = url.split('/')[-1]
        return file_name

    def item_completed(self, results, item, info):
        image_paths = [x['path'] for ok, x in results if ok]
        if not image_paths:
            raise DropItem('Image Downloaded Failed')
        return item

    def get_media_requests(self, item, info):
        yield Request(item['cover'])

数据存进mongodb
在pipelines.py文件中

class YaoqiMongoPipeline(object):
    def __init__(self, database):
        self.db = database

    @classmethod
    def from_crawler(cls, crawler):
        return cls(
            database=crawler.settings.get("MONGO_DB"),
        )

    def open_spider(self, spider):
        connect(self.db)

    def close_spider(self, spider):
        pass

    def process_item(self, item, spider):
        comic = Comic()
        comic.comic_id = item['comic_id']
        comic.name = item['name']
        comic.cover = item['cover']
        comic.category = item['category']
        comic.save()
        return item

在settings.py文件中

ITEM_PIPELINES = {
# 'youyaoqi.pipelines.U17MysqlPipeline': 300,
# 'youyaoqi.pipelines.U17ImagePipeline': 310,
'youyaoqi.pipelines.YaoqiMongoPipeline': 320,
}
配置mongo路径

MONGO_DB = 'yaoqi'