上传图片并使用Flask将其作为响应显示回去 [英] Upload an Image and Display it back as a response using Flask
问题描述
我是前端开发的初学者，必须在Flask中做一个小型Web应用程序才能进行项目.
I'm a beginner in front end development, and have to do a small web app in Flask for a project.
我编写了一个Flask应用，该应用可让您使用HTML表单上传图片，然后在您点击上传"时将图片显示给用户.我需要对此进行修改，以使该图像不会在用户每次上载时都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的正文中.
I have written a Flask app that lets you upload an image using HTML Forms and then displays the image back to the user when you hit Upload. I need to modify this such that the image does not get saved to a folder in the project directory everytime a user uploads it. Basically, the app should send the uploaded image back in the body of the response.
到目前为止，这是我的代码:
Here is my code so far:
UploadTest.py
UploadTest.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
upload.html - creates an upload form
<!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-在用户单击上载"后显示保存该文件夹中的图像
complete.html - displays the image from the folder in which it has been saved after a user hits "upload"
<!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，但是除了显示文件夹后无法删除以外，找不到其他东西(我认为这不是解决当前问题的正确方法).我真的很感谢在这方面的任何帮助，如果有比我的代码目前更好的解决方案，我希望了解更多！
I have tried researching quite a bit but was unable to find anything other than deleting the folder after it has been displayed (which I didn't think is the right way of solving the question at hand). I'd really appreciate any help in this matter, and if there is a better solution than what my code currently does, I'd love to learn more!
谢谢！ :)
推荐答案
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.
Please check below code can help you.Copy the below code in upload.html in templates folder.
<!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>
将以下代码复制到static文件夹中的upload.js文件中
Copy the below code in upload.js file in static folder
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]);
}
}
现在将以下代码复制到python文件中
Now copy the below code in a python file
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)
以上代码段将帮助您浏览和显示html页面上的图像，以及将图像保存在磁盘上的所需位置.
Above piece of code will help you to browse and display the image on html page and as well save the image on your disk at desired location.
这篇关于上传图片并使用Flask将其作为响应显示回去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！
