Flask

Flask应用

创建虚拟环境

$ python3 -m venv Flask_env

修改环境目录权限

$ sudo chown -R pi:pi Flask_env

激活虚拟环境

$ source Flask_env/bin/activate

安装Flask

$ pip install Flask

确认安装完成

$ pip list | grep Flask
Flask                  3.0.3

创建一个file_operations.py程序

$ touch file_operations.py

写入如下内容

# 导入 Flask 和其他必要的模块
from flask import Flask, request, jsonify
import os

# 创建 Flask 应用实例
app = Flask(__name__)

# 定义创建文件的 API 路由
@app.route('/create_file', methods=['POST'])
def create_file():
    # 获取请求中的 JSON 数据
    data = request.json
    # 从 JSON 数据中提取文件路径和内容
    file_path = data.get('file_path')
    content = data.get('content')

    # 检查文件路径和内容是否为空
    if not file_path or not content:
        return jsonify({'error': 'file_path and content are required'}), 400

    try:
        # 打开文件并写入内容
        with open(file_path, 'w') as file:
            file.write(content)
        # 返回成功消息
        return jsonify({'message': f'File created at {file_path} with content: {content}'}), 200
    except Exception as e:
        # 捕获异常并返回错误消息
        return jsonify({'error': str(e)}), 500

# 定义修改文件的 API 路由
@app.route('/modify_file', methods=['POST'])
def modify_file():
    # 获取请求中的 JSON 数据
    data = request.json
    # 从 JSON 数据中提取文件路径和内容
    file_path = data.get('file_path')
    content = data.get('content')

    # 检查文件路径和内容是否为空
    if not file_path or not content:
        return jsonify({'error': 'file_path and content are required'}), 400

    # 检查文件是否存在
    if not os.path.exists(file_path):
        return jsonify({'error': f'File {file_path} does not exist'}), 404

    try:
        # 打开文件并写入新的内容
        with open(file_path, 'w') as file:
            file.write(content)
        # 返回成功消息
        return jsonify({'message': f'File modified at {file_path} with content: {content}'}), 200
    except Exception as e:
        # 捕获异常并返回错误消息
        return jsonify({'error': str(e)}), 500

# 如果直接运行此文件，则启动 Flask 应用
if __name__ == '__main__':
    # 启动 Flask 应用，监听所有网络接口的 5001 端口
    app.run(host='0.0.0.0', port=5001)

运行该程序

$ python3 file_operations.py
 * Serving Flask app 'file_operations'
 * Debug mode: off
WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
 * Running on all addresses (0.0.0.0)
 * Running on http://127.0.0.1:5001
 * Running on http://10.70.32.56:5001
Press CTRL+C to quit

通过本机或其他设备进行测试

创建文件

$ curl -X POST http://10.70.32.56:5001/create_file -H "Content-Type: application/json" -d '{"file_path":"/home/pi/new_file.txt", "content":"Hello, World!"}'
{"message":"File created at /home/pi/new_file.txt with content: Hello, World!"}

服务器控制台输出

10.70.32.107 - - [01/Nov/2024 08:35:56] "POST /create_file HTTP/1.1" 200 -

查看新文件

pi@raspberrypi:~ $ cat new_file.txt 
Hello, World!

修改文件

$ curl -X POST http://10.70.32.56:5001/modify_file -H "Content-Type: application/json" -d '{"file_path":"/home/pi/new_file.txt", "content":"Hello, pi5!"}'
{"message":"File modified at /home/pi/new_file.txt with content: Hello, pi5!"}

服务器控制台输出

10.70.32.107 - - [01/Nov/2024 08:39:10] "POST /modify_file HTTP/1.1" 200 -

查看新文件

pi@raspberrypi:~ $ cat new_file.txt 
Hello, pi5!