Flask應用

創建虛擬環境

$ python3 -m venv Flask_env

修改環境目錄權限

$ sudo chown -R pi:pi Flask_env

激活虛擬環境

$ source Flask_env/bin/activate

安裝Flask

$ pip install Flask

確認安裝完成

$ pip list | grep Flask
Flask                  3.0.3

創建一個file_operations.py程序

$ touch file_operations.py

寫入如下內容

# 導入 Flask 和其他必要的模塊
from flask import Flask, request, jsonify
import os

# 創建 Flask 應用實例
app = Flask(__name__)

# 定義創建文件的 API 路由
@app.route('/create_file', methods=['POST'])
def create_file():
    # 獲取請求中的 JSON 數據
    data = request.json
    # 從 JSON 數據中提取文件路徑和內容
    file_path = data.get('file_path')
    content = data.get('content')

    # 檢查文件路徑和內容是否為空
    if not file_path or not content:
        return jsonify({'error': 'file_path and content are required'}), 400

    try:
        # 打開文件并寫入內容
        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:
        # 捕獲異常并返回錯誤消息
        return jsonify({'error': str(e)}), 500

# 定義修改文件的 API 路由
@app.route('/modify_file', methods=['POST'])
def modify_file():
    # 獲取請求中的 JSON 數據
    data = request.json
    # 從 JSON 數據中提取文件路徑和內容
    file_path = data.get('file_path')
    content = data.get('content')

    # 檢查文件路徑和內容是否為空
    if not file_path or not content:
        return jsonify({'error': 'file_path and content are required'}), 400

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

    try:
        # 打開文件并寫入新的內容
        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:
        # 捕獲異常并返回錯誤消息
        return jsonify({'error': str(e)}), 500

# 如果直接運行此文件，則啟動 Flask 應用
if __name__ == '__main__':
    # 啟動 Flask 應用，監聽所有網絡接口的 5001 端口
    app.run(host='0.0.0.0', port=5001)

運行該程序

$ 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

通過本機或其他設備進行測試

創建文件

$ 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!"}

服務器控制臺輸出

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!"}

服務器控制臺輸出

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!