从POST请求接收的werkzeug.datastructures.ImmutableMultiDict中解码图像

from flask import Flask, request
import io
from PIL import Image

app = Flask(__name__)

@app.route('/upload', methods=['POST'])
def upload_file():
    if 'file' not in request.files:
        return 'No file part', 400
    
    file = request.files['file']
    
    if file.filename == '':
        return 'No selected file', 400
    
    if file:
        try:
            # 使用 io.BytesIO 将文件内容转换为字节流
            image_stream = io.BytesIO(file.read())
            
            # 使用 PIL 打开图像
            image = Image.open(image_stream)
            
            # 进行图像处理或其他操作
            # ...
            
            return 'File successfully uploaded and processed', 200
        except Exception as e:
            return f'Error processing file: {str(e)}', 500

if __name__ == '__main__':
    app.run(debug=True)

from werkzeug.utils import secure_filename

ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'gif'}

def allowed_file(filename):
    return '.' in filename and filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS

@app.route('/upload', methods=['POST'])
def upload_file():
    if 'file' not in request.files:
        return 'No file part', 400
    
    file = request.files['file']
    
    if file.filename == '':
        return 'No selected file', 400
    
    if file and allowed_file(file.filename):
        try:
            image_stream = io.BytesIO(file.read())
            image = Image.open(image_stream)
            # 进行图像处理或其他操作
            # ...
            return 'File successfully uploaded and processed', 200
        except Exception as e:
            return f'Error processing file: {str(e)}', 500
    else:
        return 'Invalid file type', 400

import os

@app.route('/upload', methods=['POST'])
def upload_file():
    if 'file' not in request.files:
        return 'No file part', 400
    
    file = request.files['file']
    
    if file.filename == '':
        return 'No selected file', 400
    
    if file and allowed_file(file.filename):
        try:
            # 使用临时文件存储大文件
            temp_file_path = os.path.join('/tmp', secure_filename(file.filename))
            file.save(temp_file_path)
            
            with open(temp_file_path, 'rb') as f:
                image_stream = io.BytesIO(f.read())
                image = Image.open(image_stream)
                # 进行图像处理或其他操作
                # ...
            
            os.remove(temp_file_path)
            return 'File successfully uploaded and processed', 200
        except Exception as e:
            return f'Error processing file: {str(e)}', 500
    else:
        return 'Invalid file type', 400