Download file attachment react

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Introduction Here I am going to show a simple example on how to download a file from web application using Python Flask. Prerequisites Python 3. Project Directory First step is to create a project root directory under which I will put all the required files for the project. Configuring Flask Create the below app. UI Template Now create a download. Testing the Application Now navigate to the project root directory from command line tool and execute the command python main.

Source Code Download. To add an extra parameter with file upload, we can append that extra parameter in the form data at the client-side and the same can be retrieved as a request param at the server-side.

Below is an example where we appended the key as extraParam in the form data at client-side. For this, we need to have a database configuration first. Spring boot provides a very convenient way to do so by adding a few properties in application.

We will be using spring data JPA for our purpose. To save the uploaded file in the DB, we have a model class and we are using byte[] as a data type to save it in the DB.

Below is the REST implementation for this. The implementation is similar to above logic except it has a DB call to save the file instead of saving it to the local file system. You have already noticed the response of the file upload. The below implementation only difers in the process of getting the file from databse rather then a file system.

While downloading multiple files, we can create a zip file in spring boot and download that zip file alone rather then downloading multiple files individually.

Here, we will be using ZipOutputStream from java. Below is the example. To test this functionality, we can make a GET request with name as a query parameter which includes all the file names that we want to be included in the final.