How to use Python to write the file upload and download function of CMS system

How to use Python to write the file upload and download function of the CMS system

With the popularity of the Internet and the advancement of technology, website construction is no longer a complicated task, and many people have begun to use content management systems (CMS) Come and quickly build your own website. File upload and download are one of the common functions in websites. This article will introduce how to use Python to write the file upload and download function of CMS system.

1. File upload function

The file upload function refers to the function of uploading files selected by users on the web page to the server. Python provides a wealth of libraries and frameworks to implement file upload functions. The following is an example of file upload using the Flask framework:

from flask import Flask, request
from werkzeug.utils import secure_filename

app = Flask(__name__)

@app.route('/upload', methods=['POST'])
def upload_file():
    if 'file' not in request.files:
        return 'No file part'

    file = request.files['file']

    if file.filename == '':
        return 'No selected file'

    filename = secure_filename(file.filename)

    file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))

    return 'File uploaded successfully'

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

In the above code, we used the Flask framework to create a simple web application. When the user sends a request containing a file to the /upload path via POST, the server will receive the file and save it to the specified folder.

2. File download function

The file download function allows users to download files saved on the server by clicking a button or link. Python's HTTP server generally sends a response with specific response headers to implement file download operations. The following is an example of file download using the Flask framework:

from flask import Flask, send_from_directory

app = Flask(__name__)

@app.route('/download/<path:filename>')
def download_file(filename):
    return send_from_directory(app.config['UPLOAD_FOLDER'], filename, as_attachment=True)

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

In the above code, we create a /download/<filename></filename> path, when the user accesses the path , the server will send a specific response header to prompt the browser to download the file in the specified path.

3. Integration with CMS system

To integrate the file upload and download function into the CMS system, we need to integrate the above code with the framework of the CMS system. Taking Django as an example, we can handle file upload and download operations in view functions. The following is an example of processing file upload and download in Django:

from django.shortcuts import render
from django.http import HttpResponse
from django.core.files.storage import FileSystemStorage

def upload_file(request):
    if request.method == 'POST' and request.FILES['file']:
        file = request.FILES['file']
        fs = FileSystemStorage()
        filename = fs.save(file.name, file)
        return HttpResponse('File uploaded successfully')

    return render(request, 'upload.html')

def download_file(request, filename):
    fs = FileSystemStorage()
    response = HttpResponse(fs.open(filename), content_type='application/octet-stream')
    response['Content-Disposition'] = 'attachment; filename="{0}"'.format(filename)
    return response

In the above code, we use the file upload and download related classes and methods encapsulated by the Django framework to implement the file upload and download functions. By calling the corresponding functions in the view function, we can implement the file upload and download functions.

Through the above examples, we can see that using Python to write the file upload and download function of the CMS system is not complicated. Whether using Flask or Django, we can quickly implement these functions and add more functions and user experience to our CMS system. Hope this article helps you!

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