python链家新房信息获取练习

前言

保持练习

以下是本篇文章正文内容，下面案例可供参考

一、页面分析

老样子进行页面分析，ul下的li中存放着我们想要的信息，没什么好讲的。

理清楚思路，对所有一共八十几个页面进行访问，随机伪装机型和ip代理，并找到链接的请求格式。

接下来只需要使用xpath定位到相关的元素信息即可，将解析的数据存入数据库中。
进入代码编写阶段。

二、代码编写

1.数据库表的建立

代码如下：

CREATE TABLE `xinfang` (
  `id` int(255) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) DEFAULT NULL,
  `resblock_type` varchar(10) DEFAULT NULL,
  `sale_status` varchar(10) DEFAULT NULL,
  `area` varchar(10) DEFAULT NULL,
  `location` varchar(255) DEFAULT NULL,
  `resblock_room` varchar(10) DEFAULT NULL,
  `resblock_area` varchar(30) DEFAULT NULL,
  `main_price` varchar(150) DEFAULT NULL,
  `second` varchar(30) DEFAULT NULL,
  `img_url` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=843 DEFAULT CHARSET=utf8;

2.代码编写

代码如下：

import requests
from lxml import etree
from fake_useragent import UserAgent
import random
import pymysql

# 代理池
proxy_pool = [{'HTTP': '112.84.53.165:9999'}, {'HTTP': '171.35.169.58:9999'}, {'HTTP': '49.86.180.142:9999'},
              {'HTTP': '113.194.131.190:9999'}, {'HTTP': '110.243.22.233:9999'}, {'HTTP': '123.169.163.99:9999'},
              {'HTTP': '123.163.117.140:9999'}, {'HTTP': '113.195.20.166:9999'}, {'HTTP': '114.235.23.237:9000'},
              {'HTTP': '202.109.157.64:9000'}, {'HTTP': '171.35.175.31:9999'}, {'HTTP': '113.195.168.235:9999'},
              {'HTTP': '125.108.75.135:9000'}, {'HTTP': '123.101.237.3:9999'}, {'HTTP': '139.155.41.15:8118'},
              {'HTTP': '118.212.104.240:9999'}]
# 伪装头
headers = {
    'Referer': 'https://nj.fang.lianjia.com/',
    'User-Agent': UserAgent().random
}

if __name__ == '__main__':
    print('打开数据库...')
    # 打开数据库
    conn = pymysql.Connect(host='localhost', port=3306, user='root',
                           password='', db='spider', charset='utf8')
    # 链接模板 使用format填充
    base_url = 'https://nj.fang.lianjia.com/loupan/pg{}/'
    # 存放url的数组
    data = []
    print('初始化数据...')
    for i in range(1, 86):
        # 循环写入url
        data.append(base_url.format(i))
    print('开始爬取...')
    # 遍历url 请求网址 并解析
    for url in data:
        # get请求访问 使用代理
        response = requests.get(url=url, headers=headers, proxies=random.choice(proxy_pool))
        # etree解析
        res_data = etree.HTML(response.content.decode())
        # xpath定位到所有的li
        lis = res_data.xpath('//li[@class="resblock-list post_ulog_exposure_scroll has-results"]')
        # 在循环的li下进行解析
        for li in lis:
            # 图片地址
            img_url = li.xpath('./a/img/@data-original')[0].split('.592x432.jpg')[0]
            # 小区名字
            name = li.xpath('./div[@class="resblock-desc-wrapper"]/div[@class="resblock-name"]/a[1]/text()')[0]
            # 以下都是相关信息 就不做赘叙
            resblock_type = li.xpath('./div[@class="resblock-desc-wrapper"]/div[@class="resblock-name"]/span[1]/text()')[0]
            sale_status = li.xpath('./div[@class="resblock-desc-wrapper"]/div[@class="resblock-name"]/span[2]/text()')[0]
            area = li.xpath('./div[@class="resblock-desc-wrapper"]/div[@class="resblock-location"]/span[1]/text()')[0]
            location = li.xpath('./div[@class="resblock-desc-wrapper"]/div[@class="resblock-location"]/span[1]/text()')[0] + '/' + \
                       li.xpath('./div[@class="resblock-desc-wrapper"]/div[@class="resblock-location"]/span[2]/text()')[0] + '/' + \
                       li.xpath('./div[@class="resblock-desc-wrapper"]/div[@class="resblock-location"]/a[1]/text()')[0]
            resblock_room = li.xpath('./div[@class="resblock-desc-wrapper"]/a[@class="resblock-room"]/span[1]/text()')
            # 有些数据为空 要进行替换 否则数据库写入报错
            if resblock_room:
                resblock_room = resblock_room[0]
            else:
                resblock_room = '暂无信息'
            resblock_area = li.xpath('./div[@class="resblock-desc-wrapper"]/div[@class="resblock-area"]/span[1]/text()')
            if resblock_area:
                resblock_area = resblock_area[0]
            else:
                resblock_area = '暂无信息'
            main_price = li.xpath('./div[@class="resblock-desc-wrapper"]/div[@class="resblock-price"]/div[@class="main-price"]/span[@class="number"]/text()')[0]
            second = li.xpath('./div[@class="resblock-desc-wrapper"]/div[@class="resblock-price"]/div[@class="second"]/text()')
            if second:
                second = second[0]
            else:
                second = '暂无信息'
            # sql语句
            sql = 'insert into xinfang(name, resblock_type, sale_status, area, location, resblock_room, resblock_area, main_price, second, img_url) values ("{}", "{}", "{}", "{}", "{}", "{}", "{}", "{}", "{}", "{}")'.format(
                name, resblock_type, sale_status, area, location, resblock_room, resblock_area, main_price, second,
                img_url)
            cursor = conn.cursor()
            # 事务 提交 回滚
            try:
                cursor.execute(sql)
                conn.commit()
            except Exception as e:
                print(e)
                conn.rollback()
    print('爬取结束关闭数据库...')
    # 关闭数据库链接 程序结束
    conn.close()

结果

程序运行结果如下：