Steps to use Laravel framework to implement file download and resume upload

Steps to use Laravel framework to implement file download and breakpoint resume download

[Background introduction]

In web application development, file download is a common functional requirement. If the file is large or the network environment is poor, the user may need to resume the download so that the download can be resumed from where it was interrupted. This article will introduce how to implement file downloading and breakpoint resuming functions by using the Laravel framework.

[Step 1: Create a route]

First, we need to create a route to handle file download requests. Open the routes/web.php file and add the following code:

Route::get('/download', 'DownloadController@download')->name('download');

Here we define a '/download' route for a GET request and point it to the download method of the DownloadController controller.

[Step 2: Create a controller]

Next, we need to create a controller to handle file download logic. Execute the following command in the terminal to generate DownloadController:

php artisan make:controller DownloadController

Then find and open the DownloadController.php file in the app/Http/Controllers directory and add the following code:

public function download()
{
    $filePath = public_path('storage/files/example_file.pdf');
    $fileName = 'example_file.pdf';

    return response()->download($filePath, $fileName);
}

The download method here first Defines the file path $filePath and file name $fileName. Then use Laravel's response() function, combined with the download method, to return the file to the user for downloading.

[Step 3: Implement breakpoint resume download]

By default, Laravel's file download does not support breakpoint resume download. In order to implement this function, we need to do some additional configuration. Open the DownloadController.php file and add the following code:

public function download()
{
    $filePath = public_path('storage/files/example_file.pdf');
    $fileName = 'example_file.pdf';

    $headers = [
        'Content-Type' => 'application/pdf',
    ];

    return response()->file($filePath, $headers);
}

We now use the file method of the response() function to implement file downloading. At the same time, we also added a headers array and set the 'Content-Type' header to ensure that the file is downloaded with the correct MIME type.

[Step 4: Use breakpoint resume download to download files]

If you want to implement the breakpoint resume function, you may need to use a third-party library to help us complete it. In Laravel, we can use the GuzzleHttp library to achieve this functionality. First execute the following command in the terminal to install GuzzleHttp:

composer require guzzlehttp/guzzle

Then add the following code in the DownloadController.php file:

use GuzzleHttpClient;

public function download()
{
    $url = 'http://example.com/example_file.pdf';
    $fileName = 'example_file.pdf';

    $client = new Client(['sink' => public_path('storage/files/' . $fileName)]);
    $client->request('GET', $url, ['headers' => ['Range' => 'bytes=0-']]);

    return response()->download(public_path('storage/files/' . $fileName), $fileName);
}

In this example, we first define the URL and file of the file name. Next, we created a GuzzleHttpClient instance and specified the save path of the downloaded file through the 'sink' option. Then by calling the request method, send a request with the 'Range' header to achieve breakpoint resume transmission. Finally, we return the downloaded file to the user by using the response()->download() method.

[Summary]

Through the above steps, we successfully implemented the function of using the Laravel framework to realize file download and breakpoint resume download. We implemented the breakpoint resume function by creating routes, writing controller logic, and using the GuzzleHttp library. I hope this article can help you understand how to implement file download and breakpoint resume download in Laravel.

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