AIOHTTP The technique of uploading and downloading (Technical Implementation of Asynchronous File Upload and DOWNLOAD in AIOHTTP)

AIOHTTP is an asynchronous Web framework written in Python, which provides the function of processing HTTP requests and response.This article will introduce the technology implementation of asynchronous file uploading and downloading in AIOHTTP. File Upload The following steps need to be uploaded in AIOHTTP: The following steps are required: 1. Create AIOHTTP web applications. 2. Create a view function that process file upload requests in the application. 3. Get uploaded file data in the view function. 4. Use the asynchronous file I/O operation to save the file to the designated position on the server. The following is a sample code that implements asynchronous files: python from aiohttp import web async def handle_upload(request): reader = await request.multipart() field = await reader.next() assert field.name == 'file' filename = field.filename with open(filename, 'wb') as f: while True: chunk = await field.read_chunk() if not chunk: break f.write(chunk) return web.Response(text='File uploaded successfully.') app = web.Application() app.router.add_post('/upload', handle_upload) web.run_app(app) In the above code, we first created a view function of a processing file uploaded request `handle_upload`.This function obtains the file in the request through the method of `request.multipart ()`.We then iterate to obtain the file field and save it to the designated position on the server. Download Document The following steps are required to download asynchronous file downloads in AIOHTTP: 1. Create AIOHTTP web applications. 2. Create a viewing function to download the request in the application. 3. Use the asynchronous file I/O operation to read the file data into the response. 4. Set the response header information and specify the name and type of the download file. The following is an example code that implements asynchronous file downloads: python from aiohttp import web async def handle_download(request): filename = 'path/to/your/file.txt' response = web.StreamResponse() response.headers['Content-Disposition'] = f'attachment; filename="{filename}"' await response.prepare(request) with open(filename, 'rb') as f: while True: chunk = f.read(4096) if not chunk: break await response.write(chunk) return response app = web.Application() app.router.add_get('/download', handle_download) web.run_app(app) In the above code, we first created a view function of the processing file download request `handle_download`.This function opens the files on the server and uses `web.streamResponse ()` to create a current -transmitted response object.Then, we write the file data into the response block to achieve asynchronous file download. It should be noted that the above example code only shows the basic implementation methods of asylum uploading and downloading asynchronous files.In practical applications, it is also necessary to consider the size limit of file, the configuration of the file storage path, and abnormal processing. I hope that this article can help you understand the technology implementation and downloading of asynchronous file uploading and downloading in AIOHTTP, and provide relevant example code.