一.手动更新ip池
1.1在setting配置文件中新增ip池
IPPOOL=[
{“ipaddr”:”61.129.70.131:8080”},
{“ipaddr”:”61.152.81.193:9100”},
{“ipaddr”:”120.204.85.29:3128”},
{“ipaddr”:”219.228.126.86:8123”},
{“ipaddr”:”61.152.81.193:9100”},
{“ipaddr”:”218.82.33.225:53853”},
{“ipaddr”:”223.167.190.17:42789”}
]
这些IP可以从这个几个网站获取:快代理、代理66、有代理、西刺代理、guobanjia。如果出现像下面这种提示:“由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败”或者是这种，” 由 于目标计算机积极拒绝，无法连接。”. 那就是IP的问题，更换就行了。。。。发现上面好多IP都不能用。。

1.2修改middlewares.py文件

-- coding: utf-8 --

Define here the models for your spider middleware

See documentation in:

http://doc.scrapy.org/en/latest/topics/spider-middleware.html

import random  
from scrapy import signals  
from youx.settings import IPPOOL  

class MyproxiesSpiderMiddleware(object):  

      def __init__(self,ip=''):  
          self.ip=ip  

      def process_request(self, request, spider):  
          thisip=random.choice(IPPOOL)  
          print("this is ip:"+thisip["ipaddr"])  
          request.meta["proxy"]="http://"+thisip["ipaddr"]  

1.3在setting里面配置DOWNLOADER_MIDDLEWARES

    DOWNLOADER_MIDDLEWARES = {
        #  'youx.middlewares.MyCustomDownloaderMiddleware': 543,
        'scrapy.contrib.downloadermiddleware.httpproxy.HttpProxyMiddleware': None,
        'youx.middlewares.MyproxiesSpiderMiddleware': 125
    } 

二.直接在middlewares.py文件里面添加ip池
2.1middlewares文件里面代码
import base64
import random
from scrapy import signals

PROXIES = [
{‘ip_port’: ‘61.160.233.8’, ‘user_pass’: ”},
{‘ip_port’: ‘125.93.149.186’, ‘user_pass’: ”},
{‘ip_port’: ‘58.38.86.181’, ‘user_pass’: ”},
{‘ip_port’: ‘119.142.86.110’, ‘user_pass’: ”},
{‘ip_port’: ‘124.161.16.89’, ‘user_pass’: ”},
{‘ip_port’: ‘61.160.233.8’, ‘user_pass’: ”},
{‘ip_port’: ‘101.94.131.237’, ‘user_pass’: ”},
{‘ip_port’: ‘219.157.162.97’, ‘user_pass’: ”},
{‘ip_port’: ‘61.152.89.18’, ‘user_pass’: ”},
{‘ip_port’: ‘139.224.132.192’, ‘user_pass’: ”}

]

    class ProxyMiddleware(object):
        def process_request(self, request, spider):
            proxy = random.choice(PROXIES)
            if proxy['user_pass'] is not None:
                request.meta['proxy'] = "http://%s" % proxy['ip_port']
                encoded_user_pass = base64.encodestring(proxy['user_pass'])
                request.headers['Proxy-Authorization'] = 'Basic ' + encoded_user_pass
            else:
                request.meta['proxy'] = "http://%s" % proxy['ip_port']

2.2setting里面代码

    DOWNLOADER_MIDDLEWARES = {
        # 'youx.middlewares.MyCustomDownloaderMiddleware': 543,
        'youx.middlewares.ProxyMiddleware': 700,
        'scrapy.contrib.downloadermiddleware.httpproxy.HttpProxyMiddleware': None,
    }

三.自动更新IP池
3.1这里写个自动获取IP的类proxies.py，执行一下把获取的IP保存到txt文件中去:

    # *-* coding:utf-8 *-*  
    import requests  
    from bs4 import BeautifulSoup  
    import lxml  
    from multiprocessing import Process, Queue  
    import random  
    import json  
    import time  
    import requests  

class Proxies(object):  

    """docstring for Proxies"""  
    def __init__(self, page=3):  
        self.proxies = []  
        self.verify_pro = []  
        self.page = page  
        self.headers = {  
        'Accept': '*/*',  
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko)   Chrome/45.0.2454.101 Safari/537.36',  
        'Accept-Encoding': 'gzip, deflate, sdch',  
        'Accept-Language': 'zh-CN,zh;q=0.8'  
        }  
        self.get_proxies()  
        self.get_proxies_nn()  

    def get_proxies(self):  
        page = random.randint(1,10)  
        page_stop = page + self.page  
        while page < page_stop:  
            url = 'http://www.xicidaili.com/nt/%d' % page  
            html = requests.get(url, headers=self.headers).content  
            soup = BeautifulSoup(html, 'lxml')  
            ip_list = soup.find(id='ip_list')  
            for odd in ip_list.find_all(class_='odd'):  
                protocol = odd.find_all('td')[5].get_text().lower()+'://'  
                self.proxies.append(protocol + ':'.join([x.get_text() for x in odd.find_all('td')[1:3]]))  
            page += 1  

    def get_proxies_nn(self):  
        page = random.randint(1,10)  
        page_stop = page + self.page  
        while page < page_stop:  
            url = 'http://www.xicidaili.com/nn/%d' % page  
            html = requests.get(url, headers=self.headers).content  
            soup = BeautifulSoup(html, 'lxml')  
            ip_list = soup.find(id='ip_list')  
            for odd in ip_list.find_all(class_='odd'):  
                protocol = odd.find_all('td')[5].get_text().lower() + '://'  
                self.proxies.append(protocol + ':'.join([x.get_text() for x in odd.find_all('td')[1:3]]))  
            page += 1  

    def verify_proxies(self):  
        # 没验证的代理  
        old_queue = Queue()  
        # 验证后的代理  
        new_queue = Queue()  
        print ('verify proxy........')  
        works = []  
        for _ in range(15):  
             works.append(Process(target=self.verify_one_proxy, args=(old_queue,new_queue)))  
        for work in works:  
            work.start()  
        for proxy in self.proxies:  
            old_queue.put(proxy)  
        for work in works:  
            old_queue.put(0)  
        for work in works:  
            work.join()  
        self.proxies = []  
        while 1:  
            try:  
                self.proxies.append(new_queue.get(timeout=1))  
            except:  
                break  
        print ('verify_proxies done!')  


    def verify_one_proxy(self, old_queue, new_queue):  
        while 1:  
            proxy = old_queue.get()  
            if proxy == 0:break  
            protocol = 'https' if 'https' in proxy else 'http'  
            proxies = {protocol: proxy}  
            try:  
                if requests.get('http://www.baidu.com', proxies=proxies, timeout=2).status_code == 200:  
                    print ('success %s' % proxy)  
                    new_queue.put(proxy)  
              except:  
                print ('fail %s' % proxy)  


if __name__ == '__main__':  
    a = Proxies()  
    a.verify_proxies()  
    print (a.proxies)  
    proxie = a.proxies   
    with open('proxies.txt', 'a') as f:  
        for proxy in proxie:  
             f.write(proxy+'\n')  

这些IP就会保存到proxies.txt文件中去。

image.png
3.2修改代理文件middlewares.py的内容为如下:

import random  
import scrapy  
from scrapy import log  


# logger = logging.getLogger()  

class ProxyMiddleWare(object):  
    """docstring for ProxyMiddleWare"""  
    def process_request(self,request, spider):  
        '''对request对象加上proxy'''  
        proxy = self.get_random_proxy()  
        print("this is request ip:"+proxy)  
        request.meta['proxy'] = proxy   


    def process_response(self, request, response, spider):  
        '''对返回的response处理'''  
        # 如果返回的response状态不是200，重新生成当前request对象  
        if response.status != 200:  
            proxy = self.get_random_proxy()  
            print("this is response ip:"+proxy)  
            # 对当前reque加上代理  
            request.meta['proxy'] = proxy   
            return request  
        return response  

    def get_random_proxy(self):  
        '''随机从文件中读取proxy'''  
        while 1:  
            with open('G:\\Scrapy_work\\myproxies\\myproxies\\proxies.txt', 'r') as f:  
            proxies = f.readlines()  
            if proxies:  
                break  
            else:  
                time.sleep(1)  
        proxy = random.choice(proxies).strip()  
        return proxy  

3.3修改下settings文件

DOWNLOADER_MIDDLEWARES = {  
 #    'youx.middlewares.MyCustomDownloaderMiddleware': 543,  
     'scrapy.contrib.downloadermiddleware.httpproxy.HttpProxyMiddleware':None,  
     'youx.middlewares.ProxyMiddleWare':125,  
     'scrapy.downloadermiddlewares.defaultheaders.DefaultHeadersMiddleware':None  
}

作者：Py_Explorer
链接：https://www.jianshu.com/p/8449b9c397bb
來源：简书
简书著作权归作者所有，任何形式的转载都请联系作者获得授权并注明出处。