How to upload MultipartFile with Spring Boot

Upload files to Servlet containers, application need register a MultipartConfigElement class. But Spring Boot makes it more easy by automatically configure it. In How to upload MultipartFile with Spring Boot tutorial, JavaSampleApproach will guide you how to upload MultipartFile with Spring Boot.

Related posts:
MultipartFile – SpringBoot + JQuery Ajax + Bootstrap.
MultipartFile – SpringBoot + AngularJs + Bootstrap.


I. Technologies

– Java 1.8
– Maven 3.3.9
– Spring Tool Suite – Version 3.8.1.RELEASE

II. Overview
1. Project Structure

upload MultipartFile project structure

2. Step to do

– Create Spring Boot project
– Create Storage Service for File Systems
– Create Upload Controller
– Create upload Views
– Config multipart.max-file
– Init Storage for File System
– Run & Enjoys results

III. Practice
1. Create Spring Boot project

– Open Spring Tool Suite, on main menu, choose File->New->Spring Starter Project, add project info, then press Next for needed dependencies:
For Template Engines, choose Thymeleaf
For Web MVC, choose Web->Web
upload MultipartFile dependencies

Press Finish, Spring Boot project will be created successfully.
Open pom.xml file to check dependencies:

2. Create Storage Service for File Systems

Create StorageService with 4 functions:
– public void store(MultipartFile file): save a file
– public Resource loadFile(String filename): load a file
– public void deleteAll(): remove all uploaded files
– public void init(): create upload directory

3. Create Upload Controller

Create UploadController class with 4 RequestMappings:
– @GetMapping(“/”): to get uploadForm
– @PostMapping(“/”): to upload a file
– @GetMapping(“/gellallfiles”): to get all uploaded file names
– @GetMapping(“/files/{filename:.+}”): to get a file from server by filename

5. Create Upload Pages

Create 2 html views:
uploadForm.html:

listFiles.html:

6. Config multipart.max-file

spring.http.multipart.max-file-size: limit total file size for each request.
spring.http.multipart.max-request-size: limit total request size for a multipart/form-data.

7. Init Storage for File System

In main SpringBoot class, use CommandLineRunner interface for initialize: StorageService

8. Run & Enjoys results

Build and Run the project with SpringBoot App mode.

Results:
– Upload Form
upload MultipartFile result-uploadform

– List all uploaded files:
upload MultipartFile result-getallfiles

IV. Sourcecode

SpringBootUploadFile


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