爬虫练习-爬取小说

# 程序启动文件    start.py
#!/usr/bin/python
# -*- coding: utf-8 -*-
import os, sys
BASEPATH = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
print(BASEPATH)
sys.path.append(BASEPATH)

from core import SpiderMan
if __name__ == '__main__':
    s=SpiderMan.SpiderMan()
    s.async()

# 爬虫调度器
#!/usr/bin/python
# -*- coding: utf-8 -*-
from gevent import spawn,monkey,joinall;monkey.patch_all()
from concurrent.futures import ThreadPoolExecutor

from core.UrlManager import UrlManager
from core.Htmldown import Htmldown
from core.Htmlparser import Htmlparser
# from core.DataOutput import DataOutput

class SpiderMan:
    def __init__(self):
        self.manager=UrlManager()               #url管理
        self.downloader=Htmldown()              #HTML下载
        self.parser=Htmlparser()                #HTML解析
        # self.output=DataOutput()

    def index_work(self):
        '''
        爬取凌霄主页
        '''
        url = 'http://www.lingxiaozhishang.com'
        self.manager.oldurls.add(url)              #列表中添加每次传进来的url
        html_dict = self.downloader.down_page(url)     #下载器下载
        if html_dict is None:
            # raise print("爬取主页出错了")
            print("爬取主页出错了")
            return None

        new_urls = self.parser.parser_index(html_dict,url)       # 解析二层链接
        self.manager.add_urls(new_urls)                          # 所有的a标签存放的列表
        print("爬取 主页 + 所有文章url 完成")


    def async(self):
        '''
        开启协程
        '''
        self.index_work()
        pool = ThreadPoolExecutor(10)         # 开启十个线程池
        while True:
            url = self.manager.get_url()      # 从url管理器中获取url
            if url is None:
                break
            pool.submit(self.downloader.down_page,url).add_done_callback(self.parser.parser_page)   # 提交下载任务，解析
        pool.shutdown(wait=True)                    #最后得关闭线程池
        print("完了-----------------------")

# URL管理器
#!/usr/bin/python
# -*- coding: utf-8 -*-
class UrlManager:
    def __init__(self):
        self.newurls=set()
        self.oldurls=set()


    def add_url(self,newurl):
        '''
        添加小说章节的url
        :return:
        '''
        if newurl not in self.oldurls:
            self.newurls.add(newurl)

    def add_urls(self,newurls):
        '''
        添加多个小说章节的url
        :param newurls:
        :return:
        '''
        if len(newurls)==0:return
        for url in newurls:
            self.add_url(url)

    def get_url(self):
        '''
        取出一个小说章节的url
        :return:
        '''
        try:
            url = self.newurls.pop()
            if url is not None:
                self.oldurls.add(url)
                return url
        except KeyError:
            pass


    def has_oldurls(self):
        '''
        返回已爬小说章节的数量
        :return:
        '''
        return len(self.oldurls)

# HTML下载器
#!/usr/bin/python
# -*- coding: utf-8 -*-
import requests
class Htmldown:
    def  down_page(self,url):
        '''
        下载网页内容
        '''
        headers={'User-Agent':'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0'}
        r=requests.get(url,headers=headers)
        r.encoding='utf8'
        if r.status_code==200:
            return r.text

# HTML解析器      解析完直接存储到文件了，应该持久化到MongoDB中
#!/usr/bin/python
# -*- coding: utf-8 -*-
from bs4 import BeautifulSoup

class Htmlparser:

    def parser_index(self,html_conf,url):
        soup = BeautifulSoup(html_conf, 'html.parser')

        list_a = soup.find(class_="chapterlist").find_all('a')
        new_urls=[]
        for a in list_a:
            #url=http://www.lingxiaozhishang.com
            #/book/439.html
            new_url ="%s%s"%(url,a.attrs["href"])
            new_urls.append(new_url)
        return new_urls


    def parser_page(self,html_conf):
        '''
        解析小说章节页面
        :param html_conf:
        :return:
        '''
        html_conf =html_conf.result()
        soup=BeautifulSoup(html_conf,'html.parser')
        title = soup.find('h1').get_text()
        text = soup.find(id="BookText").get_text()

        filepath = r"C:UsersAdministratorDesktopArticledb\%s.txt"%title
        with open(filepath,"w") as f:
            f.write(text)
        print("%s 下载完成"%title)

爬虫练习-爬取小说

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