gpt4 book ai didi

python - 使用 Flask 上传图像并将其显示为响应

转载 作者:搜寻专家 更新时间:2023-10-31 19:30:48 25 4
gpt4 key购买 nike

我是前端开发的初学者,必须在 Flask 中为一个项目做一个小型网络应用程序。

我编写了一个 Flask 应用程序,它允许您使用 HTML 表单上传图像,然后在您点击“上传”时将图像显示给用户。我需要对此进行修改,以便每次用户上传图像时图像都不会保存到项目目录中的文件夹中。基本上,应用程序应将上传的图像发送回响应正文。

到目前为止,这是我的代码:

上传测试.py

import os


from uuid import uuid4

from flask import Flask, request, render_template, send_from_directory

app = Flask(__name__)
# app = Flask(__name__, static_folder="images")



APP_ROOT = os.path.dirname(os.path.abspath(__file__))

@app.route("/")
def index():
return render_template("upload.html")

@app.route("/upload", methods=["POST"])
def upload():
target = os.path.join(APP_ROOT, 'images/')
print(target)
if not os.path.isdir(target):
os.mkdir(target)
else:
print("Couldn't create upload directory: {}".format(target))
print(request.files.getlist("file"))
for upload in request.files.getlist("file"):
print(upload)
print("{} is the file name".format(upload.filename))
filename = upload.filename
destination = "/".join([target, filename])
print ("Accept incoming file:", filename)
print ("Save it to:", destination)
upload.save(destination)

return render_template("complete.html", image_name=filename)

@app.route('/upload/<filename>')
def send_image(filename):
return send_from_directory("images", filename)

if __name__ == "__main__":
app.run(port=8080, debug=True)

upload.html - 创建一个上传表单

<!DOCTYPE html>
<html>
<head>
<title>Upload</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
</head>
<body>

<form id="upload-form" action="{{ url_for('upload') }}" method="POST" enctype="multipart/form-data">

<strong>Files:</strong><br>
<input id="file-picker" type="file" name="file" accept="image/*" multiple>
<div id="msg"></div>
<input type="submit" value="Upload!" id="upload-button">
</form>
</body>
<script>

$("#file-picker").change(function(){

var input = document.getElementById('file-picker');

for (var i=0; i<input.files.length; i++)
{

var ext= input.files[i].name.substring(input.files[i].name.lastIndexOf('.')+1).toLowerCase()

if ((ext == 'jpg') || (ext == 'png'))
{
$("#msg").text("Files are supported")
}
else
{
$("#msg").text("Files are NOT supported")
document.getElementById("file-picker").value ="";
}

}


} );

</script>
</html>

complete.html - 在用户点击“上传”后显示保存图像的文件夹中的图像

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
Uploaded
<img src=" {{url_for('send_image', filename=image_name)}}">
</body>
</html>

我已经尝试了很多研究,但除了在文件夹显示后将其删除之外找不到其他任何东西(我认为这不是解决手头问题的正确方法)。我真的很感激在这件事上的任何帮助,如果有比我的代码目前所做的更好的解决方案,我很乐意了解更多!

谢谢! :)

最佳答案

请检查以下代码是否对您有帮助。将以下代码复制到 templates 文件夹中的 upload.html 中。

<!DOCTYPE html>

<html>
<head>
<link class="jsbin" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1/themes/base/jquery-ui.css" rel="stylesheet" type="text/css" />
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.0/jquery-ui.min.js"></script>
<meta charset=utf-8 />

<script src="{{ url_for('static', filename='upload.js') }}"></script>

<style>
article, aside, figure, footer, header, hgroup,
menu, nav, section { display: block; }
</style>
</head>
<body>
<form action = "http://127.0.0.1:5000/uploader" method = "POST"
enctype = "multipart/form-data">
<input type='file' name = 'file' onchange="readURL(this);" />
<img id="blah" src="#" alt="your image" />
<input type = "submit"/>
</form>
</body>
</html>

复制以下代码到static文件夹下的upload.js文件

function readURL(input) {
if (input.files && input.files[0]) {
var reader = new FileReader();

reader.onload = function (e) {
$('#blah')
.attr('src', e.target.result)
.width(150)
.height(200);
};

reader.readAsDataURL(input.files[0]);
}
}

将下面的代码复制到一个python文件中

from flask import Flask, render_template, request
from werkzeug import secure_filename
import os

app = Flask(__name__)

app.config['UPLOAD_FOLDER'] = 'D:/Projects/flask/image_upload/images/'

@app.route('/')
def upload_f():
return render_template('upload.html')

@app.route('/uploader', methods = ['GET', 'POST'])
def upload_file():
if request.method == 'POST':
f = request.files['file']
f.save(os.path.join(app.config['UPLOAD_FOLDER'],secure_filename(f.filename)))
return 'file uploaded successfully'

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

以上代码将帮助您在 html 页面上浏览和显示图像,并将图像保存在磁盘上所需的位置。

关于python - 使用 Flask 上传图像并将其显示为响应,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42825157/

25 4 0
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com