實驗環(huán)境

1.安裝Python 3.7

2.安裝requests, bs4，pymysql 模塊

實驗步驟1.安裝環(huán)境及模塊

可參考https://www.jb51.net/article/194104.htm

2.編寫代碼

# 51cto 博客頁面數(shù)據(jù)插入mysql數(shù)據(jù)庫# 導入模塊import reimport bs4import pymysqlimport requests# 連接數(shù)據(jù)庫賬號密碼db = pymysql.connect(host=’172.171.13.229’, user=’root’, passwd=’abc123’, db=’test’, port=3306, charset=’utf8’)# 獲取游標cursor = db.cursor()def open_url(url): # 連接模擬網(wǎng)頁訪問 headers = { ’user-agent’: ’Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) ’ ’Chrome/57.0.2987.98 Safari/537.36’} res = requests.get(url, headers=headers) return res# 爬取網(wǎng)頁內(nèi)容def find_text(res): soup = bs4.BeautifulSoup(res.text, ’html.parser’) # 博客名 titles = [] targets = soup.find_all('a', class_='tit') for each in targets: each = each.text.strip() if '置頂' in each: each = each.split(’ ’)[0] titles.append(each) # 閱讀量 reads = [] read1 = soup.find_all('p', class_='read fl on') read2 = soup.find_all('p', class_='read fl') for each in read1: reads.append(each.text) for each in read2: reads.append(each.text) # 評論數(shù) comment = [] targets = soup.find_all('p', class_=’comment fl’) for each in targets: comment.append(each.text) # 收藏 collects = [] targets = soup.find_all('p', class_=’collect fl’) for each in targets: collects.append(each.text) # 發(fā)布時間 dates=[] targets = soup.find_all('a', class_=’time fl’) for each in targets: each = each.text.split(’：’)[1] dates.append(each) # 插入sql 語句 sql = '''insert into blog (blog_title,read_number,comment_number, collect, dates) values( ’%s’, ’%s’, ’%s’, ’%s’, ’%s’);''' # 替換頁面 xa0 for titles, reads, comment, collects, dates in zip(titles, reads, comment, collects, dates): reads = re.sub(’s’, ’’, reads) comment = re.sub(’s’, ’’, comment) collects = re.sub(’s’, ’’, collects) cursor.execute(sql % (titles, reads, comment, collects，dates)) db.commit() pass# 統(tǒng)計總頁數(shù)def find_depth(res): soup = bs4.BeautifulSoup(res.text, ’html.parser’) depth = soup.find(’li’, class_=’next’).previous_sibling.previous_sibling.text return int(depth)# 主函數(shù)def main(): host = 'https://blog.51cto.com/13760351' res = open_url(host) # 打開首頁鏈接 depth = find_depth(res) # 獲取總頁數(shù) # 爬取其他頁面信息 for i in range(1, depth + 1): url = host + ’/p’ + str(i) # 完整鏈接 res = open_url(url) # 打開其他鏈接 find_text(res) # 爬取數(shù)據(jù) # 關閉游標 cursor.close() # 關閉數(shù)據(jù)庫連接 db.close()if __name__ == ’__main__’: main()

3..MySQL創(chuàng)建對應的表

CREATE TABLE `blog` ( `row_id` int(11) NOT NULL AUTO_INCREMENT COMMENT ’主鍵’, `blog_title` varchar(52) DEFAULT NULL COMMENT ’博客標題’, `read_number` varchar(26) DEFAULT NULL COMMENT ’閱讀數(shù)量’, `comment_number` varchar(16) DEFAULT NULL COMMENT ’評論數(shù)量’, `collect` varchar(16) DEFAULT NULL COMMENT ’收藏數(shù)量’, `dates` varchar(16) DEFAULT NULL COMMENT ’發(fā)布日期’, PRIMARY KEY (`row_id`)) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

4.運行代碼，查看效果:

改進版：

改進內(nèi)容：

1.數(shù)據(jù)庫里面的某些字段只保留數(shù)字即可

2.默認爬取的內(nèi)容都是字符串，存放數(shù)據(jù)庫的某些字段，最好改為整型，方便后面數(shù)據(jù)庫操作

1.代碼如下：

import reimport bs4import pymysqlimport requests# 連接數(shù)據(jù)庫db = pymysql.connect(host=’172.171.13.229’, user=’root’, passwd=’abc123’, db=’test’, port=3306, charset=’utf8’)# 獲取游標cursor = db.cursor()def open_url(url): # 連接模擬網(wǎng)頁訪問 headers = { ’user-agent’: ’Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) ’ ’Chrome/57.0.2987.98 Safari/537.36’} res = requests.get(url, headers=headers) return res# 爬取網(wǎng)頁內(nèi)容def find_text(res): soup = bs4.BeautifulSoup(res.text, ’html.parser’) # 博客標題 titles = [] targets = soup.find_all('a', class_='tit') for each in targets: each = each.text.strip() if '置頂' in each: each = each.split(’ ’)[0] titles.append(each) # 閱讀量 reads = [] read1 = soup.find_all('p', class_='read fl on') read2 = soup.find_all('p', class_='read fl') for each in read1: reads.append(each.text) for each in read2: reads.append(each.text) # 評論數(shù) comment = [] targets = soup.find_all('p', class_=’comment fl’) for each in targets: comment.append(each.text) # 收藏 collects = [] targets = soup.find_all('p', class_=’collect fl’) for each in targets: collects.append(each.text) # 發(fā)布時間 dates=[] targets = soup.find_all('a', class_=’time fl’) for each in targets: each = each.text.split(’：’)[1] dates.append(each) # 插入sql 語句 sql = '''insert into blogs (blog_title,read_number,comment_number, collect, dates) values( ’%s’, ’%s’, ’%s’, ’%s’, ’%s’);''' # 替換頁面 xa0 for titles, reads, comment, collects, dates in zip(titles, reads, comment, collects, dates): reads = re.sub(’s’, ’’, reads) reads=int(re.sub(’D’, '', reads)) #匹配數(shù)字，轉(zhuǎn)換為整型 comment = re.sub(’s’, ’’, comment) comment = int(re.sub(’D’, '', comment)) #匹配數(shù)字，轉(zhuǎn)換為整型 collects = re.sub(’s’, ’’, collects) collects = int(re.sub(’D’, '', collects)) #匹配數(shù)字，轉(zhuǎn)換為整型 dates = re.sub(’s’, ’’, dates) cursor.execute(sql % (titles, reads, comment, collects,dates)) db.commit() pass# 統(tǒng)計總頁數(shù)def find_depth(res): soup = bs4.BeautifulSoup(res.text, ’html.parser’) depth = soup.find(’li’, class_=’next’).previous_sibling.previous_sibling.text return int(depth)# 主函數(shù)def main(): host = 'https://blog.51cto.com/13760351' res = open_url(host) # 打開首頁鏈接 depth = find_depth(res) # 獲取總頁數(shù) # 爬取其他頁面信息 for i in range(1, depth + 1): url = host + ’/p’ + str(i) # 完整鏈接 res = open_url(url) # 打開其他鏈接 find_text(res) # 爬取數(shù)據(jù) # 關閉游標 cursor.close() # 關閉數(shù)據(jù)庫連接 db.close()#主程序入口if __name__ == ’__main__’: main()

2.創(chuàng)建對應表

CREATE TABLE `blogs` ( `row_id` int(11) NOT NULL AUTO_INCREMENT COMMENT ’主鍵’, `blog_title` varchar(52) DEFAULT NULL COMMENT ’博客標題’, `read_number` int(26) DEFAULT NULL COMMENT ’閱讀數(shù)量’, `comment_number` int(16) DEFAULT NULL COMMENT ’評論數(shù)量’, `collect` int(16) DEFAULT NULL COMMENT ’收藏數(shù)量’, `dates` varchar(16) DEFAULT NULL COMMENT ’發(fā)布日期’, PRIMARY KEY (`row_id`)) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

3.運行代碼，驗證

升級版

為了能讓小白就可以使用這個程序，可以把這個項目打包成exe格式的文件，讓其他人，使用電腦就可以運行代碼，這樣非常方便！

1.改進代碼：

#末尾修改為：if __name__ == ’__main__’: main() print('ntt所有數(shù)據(jù)已成功存放數(shù)據(jù)庫！!! n') time.sleep(5)

2.安裝打包模塊pyinstaller(cmd安裝）

pip install pyinstaller -i https://pypi.tuna.tsinghua.edu.cn/simple/

3.Python代碼打包

1.切換到需要打包代碼的路徑下面

2.在cmd窗口運行 pyinstaller -F test03.py （test03為項目名稱）

4.查看exe包

在打包后會出現(xiàn)dist目錄，打好包就在這個目錄里面

5.運行exe包，查看效果

檢查數(shù)據(jù)庫

總結：

1.這一篇博客，是在上一篇的基礎上改進的，步驟是先爬取首頁的信息，再爬取其他頁面信息，最后在改進細節(jié)，打包exe文件

2.我們爬取網(wǎng)頁數(shù)據(jù)大多數(shù)還是存放到數(shù)據(jù)庫的，所以這種方法很實用。

3.其實在此博客的基礎上還是可以改進的，重要的是掌握方法即可。

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持好吧啦網(wǎng)。