思路分析

本次爬取的信息，包括UP主的mid、昵称、性别、头像的链接、个人简介、粉丝数、关注数、播放数、获赞数。
我的思路是，首先，选择一位B站比较火的UP主（这里以机智的党妹为例），然后，爬取其信息，再获取其关注列表中的用户和粉丝列表中的用户，重复上述操作。这相当于采用了递归的方式进行爬取。
下面我们来分析一下如何获取UP主的信息、关注列表和粉丝列表。
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用户信息请求的URL：
https://api.bilibili.com/x/space/acc/info?mid=466272

粉丝数和关注数请求的URL：
https://api.bilibili.com/x/relation/stat?vmid=466272

获赞数和播放数请求的URL：
https://api.bilibili.com/x/space/upstat?mid=466272

粉丝列表请求的URL：
https://api.bilibili.com/x/relation/followers?vmid=466272&pn=1&ps=20
关注列表请求的URL：
https://api.bilibili.com/x/relation/followings?vmid=466272&pn=1&ps=20
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这两个的分析方法其实都差不多，这里只分析其中的一个。
上面URL中的pn代表页数，ps好像是代表一次获取的用户数目，每次固定是20个（ps这个参数，我也没细看，不过这个参数并不重要）
本来以为到这里就可以了，直接写个for循环依次遍历每一页就行了，可是。。。。。。
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这个系统限制，只能访问前5页是什么鬼。ε=(´ο｀*)))唉，难道是我没登陆的问题吗？赶紧手忙脚乱的登上我的B站账号，不过，没有任何卵用，看来是B站做了限制，就只能提取前5页的数据。对于这个问题，我一直没找到解决的方法，不知道各位爬虫大佬有没有好的解决方法呀！
但是，按照我这个思路去爬取的话，还是可以爬到很多用户的，毕竟是递归爬取嘛。如果觉得爬取的用户数不够，还可以在B站的每一个分区中，选取知名UP主（粉丝数多的）作为起始URL进行爬取，这样效果会好一些。

项目目录

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代码

start.py

# ！/usr/bin/env python
# —*— coding: utf-8 —*—
# @Time:    2020/2/19 16:24
# @Author:  Martin
# @File:    start.py
# @Software:PyCharm
from scrapy import cmdline
cmdline.execute("scrapy crawl user".split())
# cmdline.execute("scrapy crawl user --nolog".split())

user.py

# -*- coding: utf-8 -*-
import scrapy
import json
from scrapy.http import Request
from BZhanUser.items import BzhanuserItem


class UserSpider(scrapy.Spider):
    name = 'user'
    allowed_domains = ['bilibili.com']
    start_urls = ['https://api.bilibili.com/x/space/acc/info?mid=466272']

    def parse(self, response):
        data = json.loads(response.body)['data']
        mid = data['mid']
        name = data['name']
        sex = data['sex']
        face = data['face']
        sign = data['sign']
        # 粉丝数和关注数
        url1 = 'https://api.bilibili.com/x/relation/stat?vmid=' + str(mid)
        yield Request(url=url1, callback=self.parse_page1,
                      meta={'mid': mid, 'name': name, 'sex': sex, 'face': face, 'sign': sign})

    def parse_page1(self, response):
        data = json.loads(response.body)['data']
        mid = data['mid']
        following = data['following']
        follower = data['follower']
        # 获赞数和播放数
        url2 = 'https://api.bilibili.com/x/space/upstat?mid=' + str(mid)
        yield Request(url=url2, callback=self.parse_page2,
                      meta={'mid': mid, 'name': response.meta['name'], 'sex': response.meta['sex'],
                            'face': response.meta['face'], 'sign': response.meta['sign'], 'follower': follower,
                            'following': following})

    def parse_page2(self, response):
        data = json.loads(response.body)['data']
        mid = response.meta['mid']
        name = response.meta['name']
        sex = response.meta['sex']
        face = response.meta['face']
        sign = response.meta['sign']
        follower = response.meta['follower']
        following = response.meta['following']
        view = data['archive']['view']
        likes = data['likes']
        item = BzhanuserItem(
            mid=mid,
            name=name,
            sex=sex,
            face=face,
            sign=sign,
            follower=follower,
            following=following,
            view=view,
            likes=likes
        )
        yield item
        for i in range(1, 6):
            following_url = 'https://api.bilibili.com/x/relation/followings?vmid=' + str(mid) + '&pn=' + str(i)
            yield Request(url=following_url, callback=self.parse_following)
        for i in range(1, 6):
            follower_url = 'https://api.bilibili.com/x/relation/followers?vmid=' + str(mid) + '&pn=' + str(i)
            yield Request(url=follower_url, callback=self.parse_follower)

    def parse_following(self, response):
        data = json.loads(response.body)['data']
        user_list = data['list']
        if user_list:
            for item in user_list:
                mid = item['mid']
                url = 'https://api.bilibili.com/x/space/acc/info?mid=' + str(mid)
                yield Request(url=url, callback=self.parse)

    def parse_follower(self, response):
        data = json.loads(response.body)['data']
        user_list = data['list']
        if user_list:
            for item in user_list:
                mid = item['mid']
                url = 'https://api.bilibili.com/x/space/acc/info?mid=' + str(mid)
                yield Request(url=url, callback=self.parse)

items.py

# -*- coding: utf-8 -*-

# Define here the models for your scraped items
#
# See documentation in:
# https://docs.scrapy.org/en/latest/topics/items.html

import scrapy


class BzhanuserItem(scrapy.Item):
    mid = scrapy.Field()
    name = scrapy.Field()
    sex = scrapy.Field()
    face = scrapy.Field()
    sign = scrapy.Field()
    follower = scrapy.Field()
    following = scrapy.Field()
    view = scrapy.Field()
    likes = scrapy.Field()

pipelines.py

# -*- coding: utf-8 -*-

# Define your item pipelines here
#
# Don't forget to add your pipeline to the ITEM_PIPELINES setting
# See: https://docs.scrapy.org/en/latest/topics/item-pipeline.html
import pymysql
from twisted.enterprise import adbapi
from pymysql import cursors


class BzhanuserPipeline(object):
    def __init__(self):
        dbparams = {
            'host': '127.0.0.1',
            'port': 3306,
            'user': 'root',
            'password': 'root',
            'database': 'bzhan',
            'charset': 'utf8mb4'
        }
        self.conn = pymysql.connect(**dbparams)
        self.cursor = self.conn.cursor()
        self._sql = None

    def process_item(self, item, spider):
        sql = self.sql()
        data = dict(item)
        self.cursor.execute(
            sql,
            (data['mid'],
             data['name'],
             data['sex'],
             data['face'],
             data['sign'],
             data['follower'],
             data['following'],
             data['view'],
             data['likes']))
        self.conn.commit()
        print(data)
        return item

    def sql(self):
        if not self._sql:
            self._sql = "insert into user(id,mid,name,sex,face,sign,follower,following,view,likes) values(null,%s,%s,%s,%s,%s,%s,%s,%s,%s)"
            return self._sql
        return self._sql

settings.py

# -*- coding: utf-8 -*-

# Scrapy settings for BZhanUser project
#
# For simplicity, this file contains only settings considered important or
# commonly used. You can find more settings consulting the documentation:
#
#     https://docs.scrapy.org/en/latest/topics/settings.html
#     https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
#     https://docs.scrapy.org/en/latest/topics/spider-middleware.html

BOT_NAME = 'BZhanUser'

SPIDER_MODULES = ['BZhanUser.spiders']
NEWSPIDER_MODULE = 'BZhanUser.spiders'

# Crawl responsibly by identifying yourself (and your website) on the user-agent
# USER_AGENT = 'BZhanUser (+http://www.yourdomain.com)'

# Obey robots.txt rules
ROBOTSTXT_OBEY = False

# Configure maximum concurrent requests performed by Scrapy (default: 16)
# CONCURRENT_REQUESTS = 32

# Configure a delay for requests for the same website (default: 0)
# See https://docs.scrapy.org/en/latest/topics/settings.html#download-delay
# See also autothrottle settings and docs
DOWNLOAD_DELAY = 1
# The download delay setting will honor only one of:
# CONCURRENT_REQUESTS_PER_DOMAIN = 16
# CONCURRENT_REQUESTS_PER_IP = 16

# Disable cookies (enabled by default)
# COOKIES_ENABLED = False

# Disable Telnet Console (enabled by default)
# TELNETCONSOLE_ENABLED = False

# Override the default request headers:
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 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36'
}

# Enable or disable spider middlewares
# See https://docs.scrapy.org/en/latest/topics/spider-middleware.html
# SPIDER_MIDDLEWARES = {
#    'BZhanUser.middlewares.BzhanuserSpiderMiddleware': 543,
# }

# Enable or disable downloader middlewares
# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
# DOWNLOADER_MIDDLEWARES = {
#    'BZhanUser.middlewares.BzhanuserDownloaderMiddleware': 543,
# }

# Enable or disable extensions
# See https://docs.scrapy.org/en/latest/topics/extensions.html
# EXTENSIONS = {
#    'scrapy.extensions.telnet.TelnetConsole': None,
# }

# Configure item pipelines
# See https://docs.scrapy.org/en/latest/topics/item-pipeline.html
ITEM_PIPELINES = {
   'BZhanUser.pipelines.BzhanuserPipeline': 300,
}

# Enable and configure the AutoThrottle extension (disabled by default)
# See https://docs.scrapy.org/en/latest/topics/autothrottle.html
# AUTOTHROTTLE_ENABLED = True
# The initial download delay
# AUTOTHROTTLE_START_DELAY = 5
# The maximum download delay to be set in case of high latencies
# AUTOTHROTTLE_MAX_DELAY = 60
# The average number of requests Scrapy should be sending in parallel to
# each remote server
# AUTOTHROTTLE_TARGET_CONCURRENCY = 1.0
# Enable showing throttling stats for every response received:
# AUTOTHROTTLE_DEBUG = False

# Enable and configure HTTP caching (disabled by default)
# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html#httpcache-middleware-settings
# HTTPCACHE_ENABLED = True
# HTTPCACHE_EXPIRATION_SECS = 0
# HTTPCACHE_DIR = 'httpcache'
# HTTPCACHE_IGNORE_HTTP_CODES = []
# HTTPCACHE_STORAGE = 'scrapy.extensions.httpcache.FilesystemCacheStorage'