如何在 Flask 中将上传的图像传递给 template.html [英] How to pass uploaded image to template.html in Flask
问题描述
我正在使用 flask，并尝试使用快速入门教程做一些非常简单的事情，只是在我的机器(本地服务器).我制作了一个简单的上传表单，它成功上传了一个图像文件.然后我想将此图像作为变量传递给 template.html 以在页面内显示.template.html 文件显示正常，但图像始终是断开的链接图像符号.我尝试了许多不同的路径，但我觉得我做的事情有点不对.
I am using flask, and trying to do something very simple using the quickstart tutorial, just running on my machine (local server). I produce a simple upload form which successfully uploads an image file. I then want to pass this image as a variable to a template.html for display within a page. The template.html file displays fine, but the image is always a broken link image symbol. I've tried a number of different paths, but I have a feeling I am doing things a bit wrong.
import os
from flask import Flask, request, redirect, url_for, send_from_directory,
render_template
UPLOAD_FOLDER = '/home/me/Desktop/projects/flask/uploads'
ALLOWED_EXTENSIONS = set(['txt', 'pdf', 'png', 'jpg', 'jpeg', 'gif'])
app = Flask(__name__)
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
def allowed_file(filename):
return '.' in filename and
filename.rsplit('.', 1)[1] in ALLOWED_EXTENSIONS
@app.route('/', methods=['GET', 'POST'])
def upload_file():
if request.method == 'POST':
file = request.files['file']
if file and allowed_file(file.filename):
filename = secure_filename(file.filename)
file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
return redirect(url_for('uploaded_file', filename=filename))
return '''
<!doctype html>
<title>Upload new File</title>
<h1>Upload new File</h1>
<form action="" method=post enctype=multipart/form-data>
<p><input type=file name=file>
<input type=submit value=Upload>
</form>
'''
@app.route('/uploads/<filename>')
def uploaded_file(filename):
filename = 'http://127.0.0.1:5000/uploads/' + filename
return render_template('template.html', filename = filename)
if __name__ == '__main__':
app.run()
这是template.html:
<!doctype html>
<title>Hello from Flask</title>
{% if filename %}
<h1>some text<img src="{{filename}}"> more text!</h1>
{% else %}
<h1>no image for whatever reason</h1>
{% endif %}
如何将上传的图片文件传递给 template.html 使其正确显示?
How can I pass the uploaded image file to template.html so it will display correctly?
谢谢
推荐答案
现在发生的是 /uploads/foo.jpg 返回 template.html 中的 HTML.在那里您尝试使用 /uploads/foo.jpg 作为 img 标签的来源.无处提供实际图像.
What's happening now is that /uploads/foo.jpg returns the HTML inside template.html. There you try to use /uploads/foo.jpg as the source of the img tag. Nowhere you serve the actual image out.
让我们像这样修改它:/show/foo.jpg 返回 HTML 页面，/uploads/foo.jpg 返回图像.用这两条替换后一条路线，你应该很高兴:
Let's modify it like this: /show/foo.jpg returns the HTML page and and /uploads/foo.jpg returns the image. Replace the latter route with these two and you should be good to go:
@app.route('/show/<filename>')
def uploaded_file(filename):
filename = 'http://127.0.0.1:5000/uploads/' + filename
return render_template('template.html', filename=filename)
@app.route('/uploads/<filename>')
def send_file(filename):
return send_from_directory(UPLOAD_FOLDER, filename)
这篇关于如何在 Flask 中将上传的图像传递给 template.html的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
