Dhiraj Ray

Dhiraj Ray

1562853745

Spring Boot Angular 8 Example

Spring Boot Angular 8 Example

#angular #java #spring-boot

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Buddha Community

Were  Joyce

Were Joyce

1622798007

Angular 12 + Spring Boot: JWT Authentication example | Spring Security

In this tutorial, I will show you how to build a full stack Angular 12 + Spring Boot JWT Authentication example. The back-end server uses Spring Boot with Spring Security for JWT Authentication & Role based Authorization, Spring Data JPA for interacting with database. The front-end will be built using Angular 12 with HttpInterceptor & Form validation.

Related Posts:

– Angular 12 + Spring Boot: CRUD example

– Angular 12 + Spring Boot: File upload example

– Spring Boot, MongoDB: JWT Authentication with Spring Security

Contents [hide]

#angular #full stack #spring #angular #angular 12 #authentication #authorization #jwt #login #registration #security #spring boot #spring security #token based authentication

Sigrid  Farrell

Sigrid Farrell

1622597127

Angular 12 + Spring Boot: CRUD example

In this tutorial, we will learn how to build a full stack Spring Boot + Angular 12 example with a CRUD App. The back-end server uses Spring Boot with Spring Web MVC for REST Controller and Spring Data JPA for interacting with embedded database (H2 database). Front-end side is made with Angular 12, HttpClient, Router and Bootstrap 4.

Run both Project on same server/port:

How to Integrate Angular with Spring Boot Rest API

Contents [hide]

#angular #full stack #spring #angular #angular 12 #crud #h2 database #mysql #postgresql #rest api #spring boot #spring data jpa

Sigrid  Farrell

Sigrid Farrell

1622600862

Angular 12 + Spring Boot + PostgreSQL example: Build CRUD App

In this tutorial, we will learn how to build a full stack Angular 12 + Spring Boot + PostgreSQL example with a CRUD App. The back-end server uses Spring Boot with Spring Web MVC for REST Controller and Spring Data JPA for interacting with PostgreSQL database. Front-end side is made with Angular 12, HTTPClient, Router and Bootstrap 4.

Older versions:

– Angular 10 + Spring Boot + PostgreSQL example: CRUD App

– Angular 11 + Spring Boot + PostgreSQL example: CRUD App

Contents [hide]

#angular #full stack #spring #angular #angular 12 #crud #postgresql #rest api #spring boot #spring data jpa

Dev Life

1609405489

Angular 11 + Spring Boot: File upload example

In this tutorial, I will show you way to build Angular 11 File upload & download example with Spring Boot server.

Original Post: https://bezkoder.com/angular-11-spring-boot-file-upload/

Overview

We're gonna create a full-stack Angular 11 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

Alt Text

All uploaded files will be saved in uploads folder:

Alt Text

Angular 11 + Spring Boot File upload Architecture

Let's look at the architecture below:

Alt Text

Angular 11 Client:

  • FileUpload Component calls UploadService functions for upload/download/display files
  • UploadService uses HttpClientModule to make HTTP requests

Spring Boot Server:

  • FilesController receives the HTTP requests from Client, then calls FilesStorageService functions for upload/download/getting files
  • FilesStorageService implements functions for storing and retrieving file systems using Java Files library

Technology

Server:
  • Java 8
  • Spring Boot 2 (with Spring Web MVC)
  • Maven 3.6.1

Client:

  • Angular 11
  • 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:

Alt Text

  • 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 11 Client for file upload/download UI

This is the project structure that we're gonna build:

Alt Text

  • 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): returns Observable<HttpEvent<any>> that we're gonna use for tracking progress
  • getFiles(): returns a list of Files' information as Observable object
export class UploadFileService {

  constructor(private http: HttpClient) { }

  upload(file: File): Observable&lt;HttpEvent&lt;any>> {
    ...
  }

  getFiles(): Observable&lt;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 11 File upload example with progress bar & Bootstrap

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 11 Client with command:
ng serve --port 8081

Open Browser with url http://localhost:8081/ and check the result.

Further Reading

Fullstack CRUD App:

Serverless with Firebase:
Angular 11 Upload File to Firebase Storage example

Conclusion

Today we're learned how to build an example for upload Files from Angular 11 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):

If you want to upload multiple files at once like this:

Alt Text

You can find the instruction here:
Angular 11 Multiple Files upload example

You will want to know how to run both projects in one place:
How to Integrate Angular with Spring Boot Rest API

Happy Learning! See you again.

#angular #spring #spring-boot #spring-framework #web-development #fullstack

I Dev

1609168513

Spring Boot + Angular 11: Pagination example (Server side)

In this tutorial, I will show you how to build a full-stack Pagination (Angular 11 + Spring Boot) example on Server side. The back-end server uses Spring Data and Spring Web for REST APIs, front-end side is an Angular 11 App with HTTPClient.

Full Article: https://bezkoder.com/pagination-spring-boot-angular-11/

Pagination with Angular 11 & Spring Boot example

Assume that we have tutorials table in database like this: spring-boot-angular-11-pagination-example-database

We need to export APIs for pagination (with/without filter) as following samples:

  • /api/tutorials?page=1&size=3
  • /api/tutorials?size=5: using default value for page
  • /api/tutorials?title=data&page=1&size=5: pagination & filter by title containing 'data'
  • /api/tutorials/published?page=2: pagination & filter by 'published' status

This is structure of the result that we want to get from the APIs:

{
    "totalItems": 12,
    "tutorials": [...],
    "totalPages": 3,
    "currentPage": 1
}

Our Angular app will display the result with pagination:

spring-boot-angular-11-pagination-example-default-paging

You can change to a page with larger index:

spring-boot-angular-11-pagination-example-change-page

Or change page size (quantity of items per page):

spring-boot-angular-11-pagination-example-change-items-per-page

Or paging with filter:

spring-boot-angular-11-pagination-example-paging-filter

Full-stack Architecture

We're gonna build the application with following architecture: spring-boot-angular-11-pagination-example-architecture
  • Spring Boot exports REST Apis using Spring Web MVC & interacts with Database using Spring Data.
  • Angular 11 Client sends HTTP Requests and retrieve HTTP Responses using axios, shows data on the components. We also use Angular Router for navigating to pages.

For more details, please visit: https://bezkoder.com/pagination-spring-boot-angular-11/

Further Reading

Fullstack CRUD App:

Or Security: Angular 11 + Spring Boot: JWT Authentication example

Happy learning, see you again!

#spring #angular #pagination #web-development #spring-boot #spring-framework