Angular 4 – Upload/Get Images to/from Spring Boot Server

Upload files to Servlet containers, application need register a MultipartConfigElement class. But Spring Boot makes it more easy by configure it automatically. In this tutorial, we’re gonna look at way to build an Angular 4 App Client to upload/get Images to/from Spring Boot RestApi Server.

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How to upload MultipartFile with Spring Boot
MultipartFile – SpringBoot + JQuery Ajax + Bootstrap.
MultipartFile – SpringBoot + AngularJs + Bootstrap.
Angular 4 Firebase – Get List Files from Storage
Angular 4 – Upload/Get MultipartFile to/from Spring Boot Server

I. Technologies

– Angular 4
– Java 1.8
– Spring Boot 1.5.7.RELEASE
– Maven 3.3.9
– Spring Tool Suite – Version 3.8.1.RELEASE

II. Overview

1. Spring Boot Server

angular-4-upload-multipart-file-spring-boot-spring-structure

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 4 App Client

angular-4-upload-multipart-file-spring-boot-angular-structure

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

angular-4-upload-image-spring-boot-server-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

1.3 Create Upload Controller

1.4 Config multipart.max-file

Open application.properties:

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.

1.5 Init Storage for File System

2. Angular 4 App Client
2.1 App Module

2.2 Upload File Service

2.3 Component for getting List of Images

list-upload.component.ts

list-upload.component.html

details-upload.component.ts

details-upload.component.html

2.4 Component for uploading Image

form-upload.component.ts

form-upload.component.html

2.5 App Component

app.component.ts

app.component.html

2.6 Integrate Spring Boot Server with Angular 4 client

– Create proxy.conf.json file under project:

– Edit package.json file for “start” script:

3. Check Results

Run Spring Boot Server and Angular 4 Client App, go to http://localhost:4200/:
angular-4-upload-image-spring-boot-server-result-run

Upload files and show list of Files:
angular-4-upload-image-spring-boot-server-result

IV. Sourcecode

SpringBootUploadFile
Angular4Upload-Images


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