How to implement the file upload and download functions of the website through Webman

How to implement the file upload and download functions of the website through Webman

Webman is a Python-based Web development framework that provides many powerful functions and tools. Making website development easier and more efficient. Among them, file uploading and downloading are common functional requirements of websites. This article will take you step by step to learn how to use Webman to implement the file upload and download functions of the website, and attaches the corresponding code examples.

1. Import required modules

First, we need to import Webman and other required modules. In Python, we can use the pip tool to install the Webman module and import the required modules using the import statement.

import webman
import os
import shutil

2. Configuring the file upload directory

In Webman, we can configure the directory for file upload. First, we need to specify a directory as the storage location for file uploads. In this example, we upload the file to the upload directory of the current project.

UPLOAD_DIR = 'upload'
if not os.path.exists(UPLOAD_DIR):
    os.makedirs(UPLOAD_DIR)

3. Implementing the file upload function

Next, we will write a Handler to handle file upload. In Webman, we can use the @webman.handler decorator to define a Handler. When processing file uploads, we use request.files.getlist('file') to get the uploaded file list and save the files to the specified directory.

@webman.handler('/upload', methods=['POST'])
def upload_handler(request):
    for file in request.files.getlist('file'):
        filename = file.filename
        filepath = os.path.join(UPLOAD_DIR, filename)
        with open(filepath, 'wb') as f:
            shutil.copyfileobj(file.file, f)
    return '文件上传成功！'

4. Implementing the file download function

In addition to file upload, file download is also one of the commonly used website functions. In Webman, we can use the @webman.handler decorator to define a Handler that handles file downloads. When handling file downloads, we use webman.FileResponse to send the file to the browser.

@webman.handler('/download/<filename>')
def download_handler(request, filename):
    filepath = os.path.join(UPLOAD_DIR, filename)
    if os.path.exists(filepath):
        return webman.FileResponse(filepath)
    else:
        return '文件不存在！'

5. Start the Web server

Finally, we need to write a main function to start the Web server and register the above Handlers.

def main():
    app = webman.Webman()
    app.add_handler(upload_handler)
    app.add_handler(download_handler)
    app.run()

if __name__ == '__main__':
    main()

The code sample is over. Through the above steps, we can use Webman to implement the file upload and download functions of the website. When we access /upload, we can select one or more files to upload; when we access /download/, we can download the specified file.

Summary

Webman is a powerful web development framework that provides many convenient functions and tools to make website development easier and more efficient. This article uses a simple example to introduce how to use Webman to implement the file upload and download functions of the website. I hope readers can use the guidance of this article to better use Webman to develop powerful websites.

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