SpringBoot RestAPIs + Thymeleaf – Upload/Download Multiple Files to FileSystem Example

springboot-restapi-upload-download-multiple-files-feature-image

In the tutorial, we show you how to create a SpringBoot RestAPIs to upload multiple files to FileSystem with Thymeleaf frontend.

Technologies

– Java 8
– Maven 3.6.1
– SpringBoot
– Thymeleaf
– Bootstrap 4

Goal

– We create a SpringBoot project as below:

springboot-restapi-upload-download-multiple-files-project-structure

– Upload Multiple Files ->

springboot-restapi-upload-download-multiple-files-thymeleaf-upload-form

springboot-restapi-upload-download-multiple-files-thymeleaf-upload-results

– Download forms ->

springboot-restapi-upload-download-multiple-files-thymeleaf-list-all-uploaded-files

springboot-restapi-upload-download-multiple-files-thymeleaf-downloaded-files

How to upload multiples files?

– We use html multiple attribute to build upload form:

– In backend controller, we handle the multiple uploaded files as below:

Practice

BackEnd Implementation
Create SpringBoot project

We use SpringToolSuite to create a SpringBoot project with below dependencies:

Implement File Storage Service

– Create FileStorage.java interface:

– Implement file storage with FileStorageImpl.java:

Create FileInfo Model

FileInfo.java ->

Upload Multiple Files Controller

UploadFileController.java ->

We can limit the size of uploaded file by using below configuration in application.properties ->

Download Files Controller

DownloadFileController.java ->

Init FileStorage with Main class

SpringBootUploadMultiFileToFileSystemApplication.java ->

FrontEnd Implementation
Thymeleaf Upload Form

uploadform.html ->

Thymeleaf Download Form

listfiles.html ->

SourceCode

SpringBootUploadMultipleFileToFileSystem

By grokonez | November 5, 2018.



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