In this tutorial, I will show you way to build File upload & download example using Angular 10, Bootstrap and Spring Boot.
More Practice:
– Thymeleaf + Spring Boot: File Upload example
– Angular 10 + Spring Boot example: Build a CRUD App
– Angular 10 + Spring Boot: JWT Authentication example
– Angular 10 + Spring Boot: Pagination example
Serverless with Firebase:
Angular 10 Firebase Storage: File Upload/Display/Delete example
Newer versions:
– Angular 11 + Spring Boot: File upload example
– Angular 12 + Spring Boot: File upload example
– Angular 13 + Spring Boot: File upload example
– Angular 14 + Spring Boot: File upload example
– Angular 15 + Spring Boot: File upload example
– Angular 16 + Spring Boot: File upload example
Contents
Overview
We’re gonna create a full-stack Angular 10 File upload to Spring Boot Server in that user can:
- see the upload process (percentage)
- view all uploaded files
- download by clicking on the file name
All uploaded files will be saved in uploads folder:
Angular 10 + Spring Boot File upload Architecture
Let’s look at the architecture below:
Angular Client:
FileUpload
Component callsUploadService
functions for upload/download/display filesUploadService
usesHttpClientModule
to make HTTP requests
Spring Boot Server:
FilesController
receives the HTTP requests from Client, then callsFilesStorageService
functions for upload/download/getting filesFilesStorageService
implements functions for storing and retrieving file systems using JavaFiles
library
Technology
Server:
- Java 17 / 11 / 8
- Spring Boot 3 / 2 (with Spring Web MVC)
- Maven
Client:
- Angular 10
- RxJS 6
- Bootstrap 4
Spring Boot Rest APIs for File Upload & Storage
Spring Boot App will provide APIs
Methods | Urls | Actions |
---|---|---|
POST | /upload | upload a File |
GET | /files | get List of Files (name & url) |
GET | /files/[filename] | download a File |
This is the project structure:
– FileInfo
contains information of the uploaded file.
– FilesStorageService
helps us to initialize storage, save new file, load file, get list of Files’ info, delete all files.
– FilesController
uses FilesStorageService
to export Rest APIs: POST a file, GET all files’ information, download a File.
– FileUploadExceptionAdvice
handles exception when the controller processes file upload.
– application.properties contains configuration for Servlet Multipart.
– pom.xml for Spring Boot dependency.
You can find Step by Step to implement the Spring Boot Server at:
Spring Boot Multipart File upload (to static folder) example
Or: Spring Boot Multipart File upload (to database) example
Angular 10 Client for file upload/download UI
This is the project structure that we’re gonna build:
– We import necessary library, components in app.module.ts.
– upload-file.service provides methods to save File and get Files from Spring Boot Server.
– upload-files.component contains upload form, progress bar, display of list files.
– app.component is the container that we embed all components.
– index.html for importing the Bootstrap.
Angular Service for File Upload
This service will use Angular HTTPClient
to send HTTP requests.
There are 2 functions:
upload(file)
: returnsObservable<HttpEvent<any>>
that we’re gonna use for tracking progressgetFiles()
: returns a list of Files’ information asObservable
object
export class UploadFileService {
constructor(private http: HttpClient) { }
upload(file: File): Observable<HttpEvent<any>> {
...
}
getFiles(): Observable<any> {
...
}
}
Angular Component for File Upload
File Upload Component has Progress Bar, Card, Button and Message. It injects UploadFileService
to call uploadService.upload()
method.
The upload progress will be calculated basing on event.loaded
and event.total
.
If the transmission is done, the event will be a HttpResponse
object. At this time, we call uploadService.getFiles()
to get the files’ information and assign the result to fileInfos
variable.
upload() {
this.progress = 0;
this.currentFile = this.selectedFiles.item(0);
this.uploadService.upload(this.currentFile).subscribe(
event => {
if (event.type === HttpEventType.UploadProgress) {
this.progress = Math.round(100 * event.loaded / event.total);
} else if (event instanceof HttpResponse) {
this.message = event.body.message;
this.fileInfos = this.uploadService.getFiles();
}
},
err => {
this.progress = 0;
this.message = 'Could not upload the file!';
});
}
You can find step by step with more details in the tutorial:
Angular 10 File upload example with progress bar
Run the App
Run Spring Boot Server with command: mvn spring-boot:run
.
Refresh the project directory and you will see uploads folder inside it.
Because we configure CORS for origin: http://localhost:8081
, so you need to run Angular 10 Client with command:
ng serve --port 8081
Open Browser with url http://localhost:8081/
and check the result.
Further Reading
- https://angular.io/api/common/http/HttpRequest
- Angular 10 + Spring Boot example: Build a CRUD App
- Angular 10 + Spring Boot: JWT Authentication example
Using Template Engine:
Thymeleaf + Spring Boot: File Upload example
Fullstack CRUD App:
– Angular 10 + Spring Boot + MySQL example
– Angular 10 + Spring Boot + PostgreSQL example
– Angular 10 + Spring Boot + MongoDB example
Serverless with Firebase:
Angular 10 Firebase Storage: File Upload/Display/Delete example
Newer versions:
– Angular 11 + Spring Boot: File upload example
– Angular 12 + Spring Boot: File upload example
– Angular 13 + Spring Boot: File upload example
– Angular 14 + Spring Boot: File upload example
– Angular 15 + Spring Boot: File upload example
Conclusion
Today we’re learned how to build an example for upload Files from Angular 10 to Spring Boot server. We also provide the ability to show list of files, upload progress using Bootstrap, and to download file from the server.
Next tutorials will show you way to implement the full-stack (with source code):
– Back-end: File Upload to Static folder / File Upload to Database
– Front-end: Angular 10 / Angular 11 / Angular 12 / Angular 13 / Angular 14 / Angular 15
If you want to upload multiple files at once like this:
You can find the instruction here:
Angular 10 Multiple Files upload example
You will want to know how to run both projects in one place:
How to Integrate Angular 10 with Spring Boot Rest API
Happy Learning! See you again.