python - masalah pengalihan hala kelalang?

Kod adalah seperti berikut. Imej boleh dimuat naik dengan jayanya, tetapi imej tidak boleh dipaparkan selepas imej berjaya dimuat naik Adakah ini cara yang betul untuk menulis ubah hala?

#!/usr/bin/env python3
# -*- coding:utf-8-*-

import os

from flask import Flask, render_template, request, redirect, url_for
from flask_uploads import UploadSet, configure_uploads, patch_request_class, IMAGES

app = Flask(__name__)

app.config['UPLOADED_PHOTOS_DEST'] = os.getcwd() + "/upload/img"
photos = UploadSet('photos', IMAGES)
configure_uploads(app, photos)
patch_request_class(app)


@app.route('/', methods=['POST', 'GET'])
def index():
    if request.method == 'POST' and 'photo' in request.files:
        filename = photos.save(request.files['photo'])
        file_url = photos.url(filename)
        print("filename = %s, file_url = %s" % (filename, file_url))
        return redirect(url_for('index', file_url=file_url))
    return render_template('index.html', file_url=None)


if __name__ == '__main__':
    app.run(port=8080)

<!doctype html>
<html>
<head>
    <title>Demo-上传文件</title>

</head>
<body>
<h1>文件上传demo</h1>
<form method="post" enctype="multipart/form-data">
    <input type="file" name="photo">
    <input type="submit" value="上传">
</form>
<br>
{% if file_url %}
    <img src="{{ file_url }}" alt="">
    {% else %}
    <p>还没有上传文件</p>
{% endif %}
</body>
</html>

----------Kemas kini----------
Ubah suai penghalaan indeks dan mencapai kesan yang diingini:

@app.route('/', methods=['POST', 'GET'])
def index():
    file_url = None
    if request.method == 'POST' and 'photo' in request.files:
        filename = photos.save(request.files['photo'])
        file_url = photos.url(filename)
        print("filename = %s, file_url = %s" % (filename, file_url))
    return render_template('index.html', file_url=file_url)

Tetapi adakah pemikiran sebelum ini salah?

phpcn_u15822756 hari yang lalu816

python - masalah pengalihan hala kelalang?

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