Let’s Develop File Upload Service From Scratch Using Java and Spring Boot

We will develop a file upload service, which will be used for image upload in our e-Commerce App using Java Spring Boot

We needed an image upload functionality for our E-Commerce App, as we need to upload images for products and categories. We will build this function as a standalone service, which can be reused later. You can use this source code for uploading and displaying images for any of your products.

First, we will build the backend in Java and Spring, then integrate it with a Web client and Android Client in other tutorials

Backend Demo

You can test the file upload demo here

Find the complete code here

Backend Design

We will have 3 APIs
1. Upload image
2. Get an image by its name
3. Get all images

Let’s have a look at FileUploadController Java class which describe above 3 APIs

which calls the FileStoreService which also contains 3 methods for each APIs respectively. I have added plenty of comments to the code. Please comment below if anything is not clear.

That’s it, files will be now renamed with a unique name saved into UPLOAD_FILE_DIR directory.

Get all the files

Download a single file by name

Next step

We will build an Android Application, which will use the APIs. The final result will look something like this.

Reference