Python案例怎么读写Cookie信息？

本文目录导读：

1. 使用 http.cookies 模块（标准库）
2. 使用 requests 库处理HTTP Cookie
3. 使用 browser_cookie3 读取浏览器Cookie
4. 文件存储Cookie（持久化）
5. 完整的Web应用示例（Flask）
6. 实用工具函数
7. 注意事项

我来介绍Python中读写Cookie信息的几种常用方法。

使用 http.cookies 模块（标准库）

from http.cookies import SimpleCookie, CookieError
# 创建Cookie
def create_cookie():
    cookie = SimpleCookie()
    cookie['username'] = '张三'
    cookie['username']['path'] = '/'
    cookie['username']['max-age'] = 3600  # 1小时后过期
    cookie['username']['domain'] = 'example.com'
    cookie['role'] = 'admin'
    cookie['role']['httponly'] = True  # 防止JavaScript访问
    # 输出Cookie字符串
    print(cookie.output())
    # 输出: Set-Cookie: username=张三; Domain=example.com; Max-Age=3600; Path=/
    #       Set-Cookie: role=admin; HttpOnly; Path=/
# 解析Cookie字符串
def parse_cookie(cookie_string):
    cookie = SimpleCookie()
    cookie.load(cookie_string)
    for key, morsel in cookie.items():
        print(f"{key}: {morsel.value}")
        print(f"  属性: {dict(morsel)}")
# 读取特定Cookie值
def get_cookie_value(cookie_string, key):
    cookie = SimpleCookie()
    cookie.load(cookie_string)
    return cookie.get(key).value if cookie.get(key) else None
# 示例
cookie_str = "username=张三; role=admin; session_id=abc123"
print(get_cookie_value(cookie_str, "username"))  # 输出: 张三

使用 requests 库处理HTTP Cookie

import requests
from http.cookiejar import CookieJar
# 方案1：自动处理Cookie（Session）
def session_cookies_example():
    # 创建session自动管理Cookie
    session = requests.Session()
    # 第一次请求，服务器可能设置Cookie
    login_response = session.post('https://httpbin.org/post', data={'username': 'test'})
    # 第二次请求会自动携带Cookie
    profile_response = session.get('https://httpbin.org/get')
    # 查看session中的Cookie
    for cookie in session.cookies:
        print(f"{cookie.name}: {cookie.value}")
# 方案2：手动设置Cookie
def manual_cookies():
    # 设置Cookie
    cookies = {
        'session_id': 'abc123',
        'username': 'admin'
    }
    response = requests.get('https://httpbin.org/get', cookies=cookies)
    # 从响应中获取Cookie
    for cookie in response.cookies:
        print(f"{cookie.name}: {cookie.value}")
# 方案3：使用CookieJar
def cookie_jar_example():
    jar = CookieJar()
    # 也可以使用requests的RequestsCookieJar
    from requests.cookies import RequestsCookieJar
    cookies = RequestsCookieJar()
    cookies.set('username', 'admin', domain='httpbin.org', path='/')
    cookies.set('token', 'xyz789', domain='httpbin.org', path='/')
    response = requests.get('https://httpbin.org/cookies', cookies=cookies)
    print(response.text)

使用 browser_cookie3 读取浏览器Cookie

# 需要安装: pip install browser-cookie3
import browser_cookie3
def read_browser_cookies():
    # 读取Chrome浏览器的Cookie
    try:
        cj = browser_cookie3.chrome(domain_name='.example.com')
        for cookie in cj:
            print(f"域名: {cookie.domain}")
            print(f"名称: {cookie.name}")
            print(f"值: {cookie.value}")
            print(f"路径: {cookie.path}")
            print(f"过期时间: {cookie.expires}")
            print("-" * 50)
    except Exception as e:
        print(f"读取Cookie失败: {e}")
# 指定特定网站的Cookie
def get_specific_cookies():
    cookies = browser_cookie3.load(domain_name='.baidu.com')
    for cookie in cookies:
        if cookie.name == 'BAIDUID':
            print(f"找到百度Cookie: {cookie.value}")

文件存储Cookie（持久化）

import json
import pickle
from http.cookies import SimpleCookie
class CookieManager:
    def __init__(self, filename='cookies.json'):
        self.filename = filename
        self.cookies = {}
    def save_cookies_json(self):
        """使用JSON保存Cookie"""
        with open(self.filename, 'w', encoding='utf-8') as f:
            json.dump(self.cookies, f, ensure_ascii=False, indent=2)
        print(f"Cookie已保存到 {self.filename}")
    def load_cookies_json(self):
        """从JSON文件加载Cookie"""
        try:
            with open(self.filename, 'r', encoding='utf-8') as f:
                self.cookies = json.load(f)
            return self.cookies
        except FileNotFoundError:
            print("Cookie文件不存在")
            return {}
    def save_cookies_pickle(self):
        """使用pickle保存Cookie对象"""
        with open('cookies.pkl', 'wb') as f:
            pickle.dump(self.cookies, f)
    def load_cookies_pickle(self):
        """从pickle文件加载Cookie"""
        try:
            with open('cookies.pkl', 'rb') as f:
                self.cookies = pickle.load(f)
            return self.cookies
        except FileNotFoundError:
            return {}
    def add_cookie(self, name, value, **kwargs):
        """添加Cookie"""
        self.cookies[name] = {
            'value': value,
            **kwargs
        }
# 使用示例
def cookie_persistence_example():
    manager = CookieManager()
    # 添加Cookie
    manager.add_cookie('session_id', 'xyz789', domain='example.com', path='/')
    manager.add_cookie('user_id', '12345', httponly=True)
    # 保存
    manager.save_cookies_json()
    # 加载
    loaded_cookies = manager.load_cookies_json()
    print(f"加载的Cookie: {loaded_cookies}")

完整的Web应用示例（Flask）

# 需要安装: pip install flask
from flask import Flask, request, make_response, jsonify
app = Flask(__name__)
app.secret_key = 'your-secret-key'
@app.route('/set_cookie')
def set_cookie():
    """设置Cookie"""
    response = make_response('Cookie已设置')
    # 设置普通Cookie
    response.set_cookie(
        'username',
        '张三',
        max_age=60*60*24,  # 24小时
        path='/',
        domain=None,
        secure=False,
        httponly=False,
        samesite='Lax'
    )
    # 设置安全Cookie
    response.set_cookie(
        'session_id',
        'abc123',
        httponly=True,  # 防止XSS攻击
        secure=True,    # 仅HTTPS传输
        samesite='Strict'
    )
    return response
@app.route('/get_cookie')
def get_cookie():
    """读取Cookie"""
    username = request.cookies.get('username')
    session_id = request.cookies.get('session_id')
    return jsonify({
        'username': username,
        'session_id': session_id,
        'all_cookies': dict(request.cookies)
    })
@app.route('/delete_cookie')
def delete_cookie():
    """删除Cookie"""
    response = make_response('Cookie已删除')
    response.delete_cookie('username')
    response.delete_cookie('session_id')
    return response
@app.route('/set_signed_cookie')
def set_signed_cookie():
    """设置签名Cookie（防篡改）"""
    from flask import session
    # Flask session自动签名
    session['user_id'] = 12345
    session['role'] = 'admin'
    session.permanent = True  # 使用配置的PERMANENT_SESSION_LIFETIME
    return '签名Cookie已设置'
@app.route('/get_signed_cookie')
def get_signed_cookie():
    """读取签名Cookie"""
    from flask import session
    user_id = session.get('user_id')
    role = session.get('role')
    return jsonify({
        'user_id': user_id,
        'role': role
    })
if __name__ == '__main__':
    app.run(debug=True)

实用工具函数

import uuid
import hashlib
import time
from datetime import datetime, timedelta
class CookieUtils:
    @staticmethod
    def generate_session_id():
        """生成唯一的session ID"""
        return str(uuid.uuid4())
    @staticmethod
    def encrypt_cookie_value(value, secret_key):
        """加密Cookie值（简单示例）"""
        return hashlib.sha256(f"{value}{secret_key}".encode()).hexdigest()
    @staticmethod
    def parse_cookie_string(cookie_string):
        """解析Cookie字符串为字典"""
        cookies = {}
        if cookie_string:
            for item in cookie_string.split(';'):
                item = item.strip()
                if '=' in item:
                    key, value = item.split('=', 1)
                    cookies[key.strip()] = value.strip()
        return cookies
    @staticmethod
    def format_cookie_dict(cookies_dict, **options):
        """将字典格式化为Cookie字符串"""
        parts = []
        for key, value in cookies_dict.items():
            parts.append(f"{key}={value}")
        # 添加通用属性
        if 'path' in options:
            parts.append(f"Path={options['path']}")
        if 'domain' in options:
            parts.append(f"Domain={options['domain']}")
        if 'max_age' in options:
            parts.append(f"Max-Age={options['max_age']}")
        if options.get('secure'):
            parts.append("Secure")
        if options.get('httponly'):
            parts.append("HttpOnly")
        return '; '.join(parts)
    @staticmethod
    def is_cookie_expired(cookie_expiry):
        """检查Cookie是否过期"""
        if cookie_expiry is None:
            return False
        return datetime.now() > cookie_expiry
# 使用示例
utils = CookieUtils()
print(f"生成Session ID: {utils.generate_session_id()}")
print(f"解析Cookie: {utils.parse_cookie_string('name=张三; age=25')}")
print(f"格式化Cookie: {utils.format_cookie_dict({'session': 'abc'}, path='/', httponly=True)}")

注意事项

1. 安全性：

   • 敏感信息不要存储在Cookie中
   • 使用httponly防止XSS攻击
   • 使用secure确保HTTPS传输
   • 使用SameSite属性防止CSRF攻击

2. 性能：

   • Cookie大小限制约4KB
   • 浏览器对Cookie数量有限制（一般50个/域）
   • 不要存储过多数据

3. 编码：

   • Cookie值需要URL编码
   • 中文等特殊字符建议编码后存储

4. 跨域：

   • Cookie默认不能跨域共享
   • 可以通过设置domain实现子域共享

这些方法涵盖了Python中处理Cookie的主要场景,你可以根据具体需求选择合适的方式。