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Flask app 配置

配置内容：文件夹路径，运行的文件类型，文件大小限制

from flask import FlaskFILE_FOLDER = 'path/to/file_folder'ALLOWED_EXTENSIONS = set(['png', 'jpg', 'jpeg'])app = Flask(__name__)app.config['UPLOAD_FOLDER'] = FILE_FOLDERapp.config['MAX_CONTENT_LENGTH'] = 16 * 1024 * 1024

上传及下载文件

from backend import ALLOWED_EXTENSIONS, app, FILE_FOLDERfrom flask import request, send_file, Blueprintfrom werkzeug.utils import secure_filenameimport osblueprint = Blueprint('file', __name__)def allowed_file(filename):    return '.' in filename and \           filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONSdef upload_file(file_id):    if 'file' not in request.files:        return False, "No file part"    file = request.files['file']    if file.filename == '':        return False, "No selected file"    if file and allowed_file(file.filename):        filename = secure_filename(file.filename)        save_name = f"{file_id}-{filename}"        file.save(os.path.join(app.config['UPLOAD_FOLDER'], save_name))        return True, save_name@blueprint.route('/
   
    ', methods=['GET'])def download_file(file_name):    if '/' in file_name:        return 'error', 400    if file_name:        return send_file(f"{FILE_FOLDER}/{file_name}", attachment_filename='file.jpg')    return 'error', 400
   

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