Angular 6 – Upload/Get MultipartFile to/from Spring Boot Server

When uploading files to Servlet containers, application needs to register a MultipartConfigElement class. But Spring Boot makes thing more easy by configuring it automatically. In this tutorial, we’re gonna look at way to build an Angular 6 App Client to upload/get MultipartFile to/from Spring Boot RestApi Server.

Related posts:
How to upload MultipartFile with Spring Boot
MultipartFile – SpringBoot + JQuery Ajax + Bootstrap.
MultipartFile – SpringBoot + AngularJs + Bootstrap.

I. Technologies

– Angular 6
– Java 1.8
– Spring Boot 2.0.3.RELEASE
– Maven 3.3.9
– Spring Tool Suite 3.9.0.RELEASE

II. Overview

1. Spring Boot Server

angular-6-upload-multipart-files-spring-boot-server-project-structure-server

StorageService helps to init, delete all files, store file, load file
UploadController uses StorageService to provide Rest API: POST a file, GET all files
application.properties to configure parameters such as MultipartFile max size…
– Spring Boot Starter Web dependency in pom.xml

2. Angular 6 App Client

angular-6-upload-multipart-files-spring-boot-server-project-structure-client

upload-file.service provides methods: push File to Storage and get Files.
list-upload.component gets and displays list of Files.
form-upload.component helps upload File.
details-upload.component is detail for each item in list of Files.

angular-6-upload-multipart-file-spring-boot-angular-overview

III. Practice

1. Spring Boot Server
1.1 Create Spring Boot project

With Dependency:

1.2 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

storage/StorageService.java

1.3 Create Upload Controller

controller/UploadController.java

1.4 Config multipart

Open application.properties:

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

1.5 Init Storage for File System

SpringBootUploadFileApplication.java

2. Angular 6 App Client
2.0 Generate Service & Components

Run commands below:
ng g s upload/UploadFile
ng g c upload/FormUpload
ng g c upload/ListUpload
ng g c upload/DetailsUpload
On each Component selector, delete app- prefix, then change tslint.json rules"component-selector" to false.

2.1 App Module

app.module.ts

2.2 Upload File Service

upload/upload-file.service.ts

2.3 Component for getting List of Files

upload/list-upload.component.ts

upload/list-upload.component.html

upload/details-upload.component.ts

upload/details-upload.component.html

2.4 Component for uploading File

upload/form-upload.component.ts

upload/form-upload.component.html

2.5 App Component

app.component.ts

app.component.html

2.6 Integrate Spring Boot Server with Angular 6 client

– Create proxy.conf.json file under project:

– Edit package.json file for ‘start’ script:

3. Check Results

Run Spring Boot Server and Angular 6 Client App (npm start).
Open Browser with url http://localhost:4200/.

Upload files and show list of Files:

angular-6-upload-multipart-files-spring-boot-server-browser-result

Inside Spring Project folder, open upload-dir folder:

angular-6-upload-multipart-files-spring-boot-server-folder-result

IV. Sourcecode

SpringBootFileUpload-Server
Angular6Upload-Client

By grokonez | June 27, 2018.



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4 thoughts on “Angular 6 – Upload/Get MultipartFile to/from Spring Boot Server”

    1. for me, it helped to start the frontend over npm run start, because it takes automatically the proxy.conf.json file. otherwise you have to define it over ng serve..

  1. I used a majority of the shown code and it works well with Angular 6 and Java 8.
    Thank you very much for taking the time to write this tutorial.

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