In this tutorial, we will learn how to build a full stack Angular 12 + Spring Boot + MongoDB example with a CRUD App. The back-end server uses Spring Boot with Spring Web MVC for REST Controller and Spring Data MongoDB for interacting with MongoDB database. Front-end side is made with Angular 12, HTTPClient & Router.
More Practice:
– Angular + Spring Boot: Pagination example
– Angular 12 + Spring Boot: JWT Authentication & Authorization example
– Angular 12 + Spring Boot: File upload example
Serverless with Firebase:
– Angular 12 Firebase CRUD Realtime DB | AngularFireDatabase
– Angular 12 Firestore CRUD example | AngularFireStore
Newer versions:
– Angular 13 + Spring Boot + MongoDB example
– Angular 14 + Spring Boot + MongoDB example
– Angular 15 + Spring Boot + MongoDB example
– Angular 16 + Spring Boot + MongoDB example
Contents
Angular 12 + Spring Boot + MongoDB CRUD example
We will build a full-stack Tutorial Application in that:
- Each Tutorial has id, title, description, published status.
- We can create, retrieve, update, delete Tutorials.
- We can also find Tutorials by title.
The images below shows screenshots of our System.
– Add a Tutorial:
– Retrieve all Tutorials:
– Click on Edit button to update a Tutorial:
On this Page, you can:
- change status to Published using Publish button
- delete the Tutorial using Delete button
- update the Tutorial details with Update button
If you want to implement Form Validation, please visit:
Angular 12 Form Validation example (Reactive Forms)
– Search Tutorials by title:
– This is tutorials
collection on the MongoDB database:
Angular 12 & Spring Boot MongoDB Architecture
This is the application architecture we will build:
– Spring Boot exports REST Apis using Spring Web MVC & interacts with MongoDB Database using Spring Data MongoDB.
– Angular 12 Client sends HTTP Requests and retrieve HTTP Responses using HttpClient Module, shows data on the components. We also use Angular Router for navigating to pages.
Spring Boot Back-end
Overview
These are APIs that Spring Boot App will export:
Methods | Urls | Actions |
---|---|---|
POST | /api/tutorials | create new Tutorial |
GET | /api/tutorials | retrieve all Tutorials |
GET | /api/tutorials/:id | retrieve a Tutorial by :id |
PUT | /api/tutorials/:id | update a Tutorial by :id |
DELETE | /api/tutorials/:id | delete a Tutorial by :id |
DELETE | /api/tutorials | delete all Tutorials |
GET | /api/tutorials?title=[keyword] | find all Tutorials which title contains keyword |
We make CRUD operations & finder methods with Spring Data MongoDB’s MongoRepository
.
Technology
- Java 17 / 11 / 8
- Spring Boot 3 / 2 (with Spring Web MVC, Spring Data MongoDB)
- MongoDB
- Maven
Project Structure
Tutorial
data model class corresponds to entity and table tutorials.TutorialRepository
is an interface that extends MongoRepository for CRUD methods and custom finder methods. It will be autowired inTutorialController
.TutorialController
is a RestController which has request mapping methods for RESTful requests such as: getAllTutorials, createTutorial, updateTutorial, deleteTutorial, findByPublished…- Configuration for Spring Data MongoDB is in application.properties.
- pom.xml contains dependencies for Spring Boot Web MVC and Spring Data MongoDB.
Create & Setup Spring Boot project
Use Spring web tool or your development tool (Spring Tool Suite, Eclipse, Intellij) to create a Spring Boot project.
Then open pom.xml and add these dependencies:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>
Configure Spring Data MongoDB
Under src/main/resources folder, open application.properties and add following lines.
spring.data.mongodb.database=bezkoder_db
spring.data.mongodb.port=27017
Define Data Model
Our Data model is Tutorial with four fields: id, title, description, published.
In model package, we define Tutorial
class.
model/Tutorial.java
package com.bezkoder.spring.data.mongodb.model;
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;
@Document(collection = "tutorials")
public class Tutorial {
@Id
private String id;
private String title;
private String description;
private boolean published;
...
}
@Document
annotation helps us override the collection name by “tutorials”.
Create Repository Interface
Let’s create a repository to interact with Tutorials from the database.
In repository package, create TutorialRepository
interface that extends MongoRepository
.
repository/TutorialRepository.java
package com.bezkoder.spring.data.mongodb.repository;
import java.util.List;
import org.springframework.data.mongodb.repository.MongoRepository;
import com.bezkoder.spring.data.mongodb.model.Tutorial;
public interface TutorialRepository extends MongoRepository<Tutorial, String> {
List<Tutorial> findByTitleContaining(String title);
List<Tutorial> findByPublished(boolean published);
}
Now we can use MongoRepository’s methods: save()
, findOne()
, findById()
, findAll()
, count()
, delete()
, deleteById()
… without implementing these methods.
We also define custom finder methods:
– findByTitleContaining()
: returns all Tutorials which title contains input title
.
– findByPublished()
: returns all Tutorials with published
having value as input published
.
The implementation is plugged in by Spring Data MongoDB automatically.
You can modify this Repository to work with Pagination, the instruction can be found at:
Spring Boot MongoDB Pagination example with Spring Data
Create Spring Rest APIs Controller
Finally, we create a controller that provides APIs for creating, retrieving, updating, deleting and finding Tutorials.
controller/TutorialController.java
package com.bezkoder.spring.data.mongodb.controller;
...
@CrossOrigin(origins = "http://localhost:8081")
@RestController
@RequestMapping("/api")
public class TutorialController {
@Autowired
TutorialRepository tutorialRepository;
@GetMapping("/tutorials")
public ResponseEntity<List<Tutorial>> getAllTutorials(@RequestParam(required = false) String title) {
}
@GetMapping("/tutorials/{id}")
public ResponseEntity<Tutorial> getTutorialById(@PathVariable("id") String id) {
}
@PostMapping("/tutorials")
public ResponseEntity<Tutorial> createTutorial(@RequestBody Tutorial tutorial) {
}
@PutMapping("/tutorials/{id}")
public ResponseEntity<Tutorial> updateTutorial(@PathVariable("id") String id, @RequestBody Tutorial tutorial) {
}
@DeleteMapping("/tutorials/{id}")
public ResponseEntity<HttpStatus> deleteTutorial(@PathVariable("id") String id) {
}
@DeleteMapping("/tutorials")
public ResponseEntity<HttpStatus> deleteAllTutorials() {
}
@GetMapping("/tutorials/published")
public ResponseEntity<List<Tutorial>> findByPublished() {
}
}
– @CrossOrigin
is for configuring allowed origins.
– @RestController
annotation is used to define a controller and to indicate that the return value of the methods should be be bound to the web response body.
– @RequestMapping("/api")
declares that all Apis’ url in the controller will start with /api
.
– We use @Autowired
to inject TutorialRepository
bean to local variable.
You can continue with step by step to implement this Spring Boot Server in the post:
Spring Boot with MongoDB CRUD example using Spring Data
Or Reactive Rest API: Spring Boot, MongoDB, Reactive CRUD example
Run Spring Boot Server
Run Spring Boot application with Maven command: mvn spring-boot:run
.
Angular 12 Front-end
Overview
– The App
component is a container with router-outlet
. It has navbar that links to routes paths via routerLink
.
– TutorialsList
component gets and displays Tutorials.
– TutorialDetails
component has form for editing Tutorial’s details based on :id
.
– AddTutorial
component has form for submission new Tutorial.
– These Components call TutorialService
methods which use Angular HTTPClient
to make HTTP requests and receive responses.
Technology
- Angular 12
- Angular HttpClient
- Angular Router
- Bootstrap 4
Project Structure
– tutorial.model.ts
exports the main class model: Tutorial
.
– There are 3 components: tutorials-list
, tutorial-details
, add-tutorial
.
– tutorial.service
has methods for sending HTTP requests to the Apis.
– app-routing.module.ts defines routes for each component.
– app
component contains router view and navigation bar.
– app.module.ts
declares Angular components and import necessary modules.
Setup Angular 12 Project
Let’s open cmd and use Angular CLI to create a new Angular Project as following command:
ng new Angular12Crud
? Would you like to add Angular routing? Yes
? Which stylesheet format would you like to use? CSS
We also need to generate some Components and Services:
ng g s services/tutorial
ng g c components/add-tutorial
ng g c components/tutorial-details
ng g c components/tutorials-list
ng g class models/tutorial --type=model
Set up App Module
Open app.module.ts and import FormsModule
, HttpClientModule
:
...
import { FormsModule } from '@angular/forms';
import { HttpClientModule } from '@angular/common/http';
@NgModule({
declarations: [ ... ],
imports: [
...
FormsModule,
HttpClientModule
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
Define Routes for Angular AppRoutingModule
There are 3 main routes:
– /tutorials
for tutorials-list
component
– /tutorials/:id
for tutorial-details
component
– /add
for add-tutorial
component
app-routing.module.ts
import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { TutorialsListComponent } from './components/tutorials-list/tutorials-list.component';
import { TutorialDetailsComponent } from './components/tutorial-details/tutorial-details.component';
import { AddTutorialComponent } from './components/add-tutorial/add-tutorial.component';
const routes: Routes = [
{ path: '', redirectTo: 'tutorials', pathMatch: 'full' },
{ path: 'tutorials', component: TutorialsListComponent },
{ path: 'tutorials/:id', component: TutorialDetailsComponent },
{ path: 'add', component: AddTutorialComponent }
];
@NgModule({
imports: [RouterModule.forRoot(routes)],
exports: [RouterModule]
})
export class AppRoutingModule { }
Define Model Class
Our main model class Tutorial
will be exported in tutorial.model.ts with 4 fields:
id
title
description
published
models/tutorial.model.ts
export class Tutorial {
id?: any;
title?: string;
description?: string;
published?: boolean;
}
Create Data Service
This service will use Angular HttpClient
to send HTTP requests.
You can see that its functions includes CRUD operations and finder method.
services/tutorial.service.ts
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';
import { Tutorial } from '../models/tutorial.model';
const baseUrl = 'http://localhost:8080/api/tutorials';
@Injectable({
providedIn: 'root'
})
export class TutorialService {
constructor(private http: HttpClient) { }
getAll(): Observable<Tutorial[]> {
return this.http.get<Tutorial[]>(baseUrl);
}
get(id: any): Observable<Tutorial> {
return this.http.get(`${baseUrl}/${id}`);
}
create(data: any): Observable<any> {
return this.http.post(baseUrl, data);
}
update(id: any, data: any): Observable<any> {
return this.http.put(`${baseUrl}/${id}`, data);
}
delete(id: any): Observable<any> {
return this.http.delete(`${baseUrl}/${id}`);
}
deleteAll(): Observable<any> {
return this.http.delete(baseUrl);
}
findByTitle(title: any): Observable<Tutorial[]> {
return this.http.get<Tutorial[]>(`${baseUrl}?title=${title}`);
}
}
Create Angular Components
As you’ve known before, there are 3 components corresponding to 3 routes defined in AppRoutingModule
.
- Add new Item Component
- List of items Component
- Item details Component
You can continue with step by step to implement this Angular App in the post:
Angular 12 CRUD Application example with Web API
Other versions:
– Angular 8 CRUD example with Web API
– Angular 10 CRUD example with Web API
– Angular 11 CRUD example with Web API
– Angular 13 CRUD example with Web API
– Angular 14 CRUD example with Web API
– Angular 15 CRUD example with Web API
– Angular 16 CRUD example with Web API
Run the Angular 12 App
You can run this App with command: ng serve --port 8081
.
If the process is successful, open Browser with Url: http://localhost:8081/
and check it.
Source Code
You can find Github source code for this tutorial at: Spring Boot + Angular example Github
Conclusion
Now we have an overview of Angular 12 + Spring Boot + MongoDB CRUD example when building a CRUD App.
We also take a look at client-server architecture for REST API using Spring Web MVC & Spring Data MongoDB, as well as Angular 12 project structure for building a front-end app to make HTTP requests and consume responses.
Next tutorials show you more details about how to implement the system:
– Back-end / Back-end with Reactive API
– Front-end:
- Using Angular 10
- Using Angular 11
- Using Angular 12
- Using Angular 13
- Using Angular 14
- Using Angular 15
- Using Angular 16
You will want to know how to run both projects in one place:
How to Integrate Angular 12 with Spring Boot Rest API
Server side Pagination:
– Front-end: Angular 12 Pagination example
– Back-end: Spring Boot MongoDB Pagination example with Spring Data
Or Angular uploading File to Spring Boot Server:
Angular 12 + Spring Boot: File upload example
Security: Angular 12 + Spring Boot: JWT Authentication & Authorization example
Serverless with Firebase:
– Angular Firebase CRUD Realtime DB | AngularFireDatabase
– Angular Firestore CRUD example | AngularFireStore
Happy learning, see you again!