如何通过Python将API返回的JPG图片文件保存至本地系统？

首先，从你提供的API响应中，我们可以提取出文件下载链接（links数组中rel="self"对应的href）和目标文件名（fileName字段），然后通过Python的requests库完成文件下载与本地保存。

实现步骤 #

1. 解析API返回的JSON数据，提取关键信息
2. 发送GET请求获取文件二进制内容
3. 将二进制内容写入本地文件

完整代码示例 #

import requests
import json

# 你的API响应内容（已修正转义引号）
api_response = '''{"contentType":"image/jpeg","createdTime":"2021-10-10T11:00:47.000Z","fileName":"Passport_Chris J Passport Color - pp.jpg","id":10144,"size":105499,"updatedTime":"2021-10-10T11:00:47.000Z","links":[{"rel":"self","href":"https://dafzprod.custhelp.com/services/rest/connect/v1.4/CompanyRegd.ManagerDetails/43/FileAttachments/10144?download="},{"rel":"canonical","href":"https://dafzprod.custhelp.com/services/rest/connect/v1.4/CompanyRegd.ManagerDetails/43/FileAttachments/10144"},{"rel":"describedby","href":"https://dafzprod.custhelp.com/services/rest/connect/v1.4/metadata-catalog/CompanyRegd.ManagerDetails/FileAttachments","mediaType":"application/schema+json"}]}'''

# 解析JSON数据
response_data = json.loads(api_response)

# 提取下载链接和目标文件名
download_url = next(link['href'] for link in response_data['links'] if link['rel'] == 'self')
target_filename = response_data['fileName']

# 下载并保存文件（若API需认证，添加headers参数，如headers={'Authorization': 'Bearer YOUR_TOKEN'}）
try:
    with requests.get(download_url, stream=True) as r:
        r.raise_for_status()  # 检查请求是否成功
        with open(target_filename, 'wb') as f:
            # 分块写入，避免内存占用过高
            for chunk in r.iter_content(chunk_size=8192):
                f.write(chunk)
    print(f"文件已成功保存为: {target_filename}")
except requests.exceptions.RequestException as e:
    print(f"下载失败: {e}")

注意事项 #

• 如果API需要身份验证（如Bearer令牌、API密钥），请在requests.get方法中添加对应的headers参数
• stream=True用于分块处理文件，适合大文件下载，也能适配你这个100KB左右的文件
• 代码中用next()快速定位到rel="self"的下载链接，确保能正确获取文件资源地址

内容的提问来源于stack exchange，提问作者muhamed fasil