Spring Boot + Angular 6 CRUD Example

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In this tutorial, we will learn how to develop a single page application(SPA) using Angular 6 as a front-end and Spring boot restful API as a backend.

If you are looking for Angular 7 with spring boot 2 integration example then check out Spring Boot + Angular 7 CRUD Example article.

Recommendation - Check out the same tutorial upgraded using the latest release of Angular 8 at Spring Boot + Angular 8 CRUD Example Tutorial // Recommended the latest release of Angular 8.

Spring Boot + Angular 8 CRUD Example Tutorial

You can download the source code of this tutorial from my GitHub repository at the end of this tutorial.

Video Tutorial

This tutorial is explained in below YouTube video. Subscribe to our youtube channel for future updates at https://www.youtube.com/c/javaguides.

Features Implementation

Create an Employee

Update an Employee

List of Employees

Delete Employee

View Employee

You will develop your first FULL STACK Application with Angular 8 and Spring Boot.

Important: Note that update employee and view employee features covered in Spring Boot + Angular 8 CRUD Example Tutorial.

What you'll learn

You will develop your first FULL STACK Application with Angular 6 and Spring Boot
You will learn the basics of building AWESOME frontend Applications with Angular 6
You will be introduced to building great RESTful APIs with Spring Boot
You will learn to solve the challenges of connecting an Angular frontend to a RESTful API
You will learn the basics of Angular - Angular Modules, Components, Data Binding and Routing
You will learn to connect REST API to JPA/Hibernate with Spring Boot
You will learn to use a wide variety of Spring Boot Starter Projects - Spring Boot Web, and Spring Boot Data JPA

What we will build?

Basically, we will create two projects:

springboot2-jpa-crud-example: This project is used to develop CRUD RESTFul APIs for a simple Employee Management System using Spring Boot 2, JPA and MySQL as a database.
angular6-springboot-client: This project is used to develop single page application using Angular 6 as front-end technology. This angular 6 application consumes CRUD Restful APIs developed and exposed by a springboot2-jpa-crud-example project.

Let me list out tools and technologies used to develop these two applications.

Tools and technologies used

Server-side technologies

Spring Boot - 2.0.4.RELEASE
JDK - 1.8 or later
Spring Framework - 5.0.8 RELEASE
Hibernate - 5.2.17.Final
Spring Data JPA - 2+

Front end technologies

Angular 6
Bootstrap 4
npm- 6.4.1
JQuery

Tools

Maven - 3.2+
IDE - Eclipse or Spring Tool Suite (STS)
Visual Studio 2017
Angular CLI

Spring Boot CRUD Rest APIs

Let's first we will build a CRUD RESTFul APIs for a Simple Employee Management System using Spring Boot 2 JPA and MySQL. Later we will consume these Rest APIs using Angular 6 client application. Following are five REST APIs (Controller handler methods) are created for Employee resource.

1. Creating and Importing a Project

There are many ways to create a Spring Boot application. The simplest way is to use Spring Initializrat http://start.spring.io/, which is an online Spring Boot application generator.

Look at the above diagram, we have specified the following details:

Generate: Maven Project
Java Version: 1.8 (Default)
Spring Boot:2.0.4
Group: net.guides.springboot2
Artifact: springboot2-jpa-crud-example
Name: springboot2-jpa-crud-example
Description: Rest API for a Simple Employee Management Application
Package Name : net.guides.springboot2.springboot2jpacrudexample
Packaging: jar (This is the default value)
Dependencies: Web, JPA, MySQL, DevTools

Once, all the details are entered, click on Generate Project button will generate a spring boot project and downloads it. Next, Unzip the downloaded zip file and import it into your favorite IDE.

2. Packaging Structure

Following is the packing structure of our Employee Management System -

3. The pom.xml File

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>net.guides.springboot2</groupId>
    <artifactId>springboot2-jpa-crud-example</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springboot2-jpa-crud-example</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
       </dependency>
       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-web</artifactId>
       </dependency>

       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-devtools</artifactId>
           <scope>runtime</scope>
       </dependency>
       <dependency>
           <groupId>mysql</groupId>
           <artifactId>mysql-connector-java</artifactId>
           <scope>runtime</scope>
       </dependency>
       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-test</artifactId>
           <scope>test</scope>
      </dependency>
    </dependencies>

    <build>
        <plugins>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
     </build>
</project>

4. Create JPA Entity - Employee.java

package net.guides.springboot2.springboot2jpacrudexample.model;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "employees")
public class Employee {

    private long id;
    private String firstName;
    private String lastName;
    private String emailId;
 
    public Employee() {
  
    }
 
    public Employee(String firstName, String lastName, String emailId) {
         this.firstName = firstName;
         this.lastName = lastName;
         this.emailId = emailId;
    }
 
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
        public long getId() {
        return id;
    }
    public void setId(long id) {
        this.id = id;
    }
 
    @Column(name = "first_name", nullable = false)
    public String getFirstName() {
        return firstName;
    }
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
 
    @Column(name = "last_name", nullable = false)
    public String getLastName() {
        return lastName;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
 
    @Column(name = "email_address", nullable = false)
    public String getEmailId() {
        return emailId;
    }
    public void setEmailId(String emailId) {
        this.emailId = emailId;
    }

    @Override
    public String toString() {
        return "Employee [id=" + id + ", firstName=" + firstName + ", lastName=" + lastName + ", emailId=" + emailId
       + "]";
    }
 
}

5. Create a Spring Data Repository - EmployeeRepository.java

package net.guides.springboot2.springboot2jpacrudexample.repository;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

import net.guides.springboot2.springboot2jpacrudexample.model.Employee;

@Repository
public interface EmployeeRepository extends JpaRepository<Employee, Long>{

}

6. Create Spring Rest Controller - EmployeeController.java

package net.guides.springboot2.springboot2jpacrudexample.controller;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.validation.Valid;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import net.guides.springboot2.springboot2jpacrudexample.exception.ResourceNotFoundException;
import net.guides.springboot2.springboot2jpacrudexample.model.Employee;
import net.guides.springboot2.springboot2jpacrudexample.repository.EmployeeRepository;

@RestController
@RequestMapping("/api/v1")
public class EmployeeController {
    @Autowired
    private EmployeeRepository employeeRepository;

    @GetMapping("/employees")
    public List<Employee> getAllEmployees() {
        return employeeRepository.findAll();
    }

    @GetMapping("/employees/{id}")
    public ResponseEntity<Employee> getEmployeeById(@PathVariable(value = "id") Long employeeId)
        throws ResourceNotFoundException {
        Employee employee = employeeRepository.findById(employeeId)
          .orElseThrow(() -> new ResourceNotFoundException("Employee not found for this id :: " + employeeId));
        return ResponseEntity.ok().body(employee);
    }
    
    @PostMapping("/employees")
    public Employee createEmployee(@Valid @RequestBody Employee employee) {
        return employeeRepository.save(employee);
    }

    @PutMapping("/employees/{id}")
    public ResponseEntity<Employee> updateEmployee(@PathVariable(value = "id") Long employeeId,
         @Valid @RequestBody Employee employeeDetails) throws ResourceNotFoundException {
        Employee employee = employeeRepository.findById(employeeId)
        .orElseThrow(() -> new ResourceNotFoundException("Employee not found for this id :: " + employeeId));

        employee.setEmailId(employeeDetails.getEmailId());
        employee.setLastName(employeeDetails.getLastName());
        employee.setFirstName(employeeDetails.getFirstName());
        final Employee updatedEmployee = employeeRepository.save(employee);
        return ResponseEntity.ok(updatedEmployee);
    }

    @DeleteMapping("/employees/{id}")
    public Map<String, Boolean> deleteEmployee(@PathVariable(value = "id") Long employeeId)
         throws ResourceNotFoundException {
        Employee employee = employeeRepository.findById(employeeId)
       .orElseThrow(() -> new ResourceNotFoundException("Employee not found for this id :: " + employeeId));

        employeeRepository.delete(employee);
        Map<String, Boolean> response = new HashMap<>();
        response.put("deleted", Boolean.TRUE);
        return response;
    }
}

Enable CORS on the Server

To enable CORS on the server, add a @CrossOrigin annotation to the EmployeeController.

@CrossOrigin(origins = "http://localhost:4200")
@RestController
@RequestMapping("/api/v1")
public class EmployeeController {
 // ....
}

7. Running Application

This spring boot application has an entry point Java class called SpringBootCrudRestApplication.java with the public static void main(String[] args) method, which you can run to start the application.

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

The main() method uses Spring Boot’s SpringApplication.run() method to launch an application. You can refer below gif file:

Or you can start spring boot application via command line using mvn spring-boot:run command.

This completes the development of Spring boot CRUD Rest APIs. Now we will develop client application using Angular 6.

Angular 6 Client Application

Let's develop a step by step Angular 6 SPA(single page application) to consume above CRUD rest APIs.

I am assuming that you have basic knowledge of using Angular 6 and Angular CLI.

The Angular CLI is a command-line interface tool that you use to initialize, develop, scaffold, and maintain Angular applications.

If you are new to Angular CLI then check out official documentation at https://cli.angular.io.

Create Angular 6 client application using Angular CLI

You can install angular by typing the following command in your terminal -

$ npm install -g @angular/cli

Once installed, let's use below command to generate an Angular 6 client application. We name this project as "angular6-springboot-client".

ng new angular6-springboot-client

Components, Services, and Modules

Let's list out what are components, service, and modules we are going to create in this application. We will use Angular CLI to generate components, services because Angular CLI follows best practices and saves much of time.

Components

create-employee
employee-list
employee-details

Services

employee.service.ts - Service for Http Client methods

Modules

FormsModule
HttpClientModule
AppRoutingModule.

Employee Class (Typescript class)

employee.ts: class Employee (id, firstName, lastName, emailId)

In this next step, we will generate these components, classes, and services using Angular CLI.

Create Service & Components

Let's auto-generate service and components using Angular CLI . Change your project directory to angular6-springboot-client\src\app and run following commands:

- ng g s employee
– ng g c create-employee
– ng g c employee-details
– ng g c employee-list

Here is complete command and output for your reference:

C:\angular6\angular6-springboot-client\src\app>ng g s employee
CREATE src/app/employee.service.spec.ts (343 bytes)
CREATE src/app/employee.service.ts (137 bytes)

C:\angular6\angular6-springboot-client\src\app>ng g c create-employee
CREATE src/app/create-employee/create-employee.component.html (34 bytes)
CREATE src/app/create-employee/create-employee.component.spec.ts (685 bytes)
CREATE src/app/create-employee/create-employee.component.ts (304 bytes)
CREATE src/app/create-employee/create-employee.component.css (0 bytes)
UPDATE src/app/app.module.ts (509 bytes)

C:\angular6\angular6-springboot-client\src\app>ng g c employee-details
CREATE src/app/employee-details/employee-details.component.html (35 bytes)
CREATE src/app/employee-details/employee-details.component.spec.ts (692 bytes)
CREATE src/app/employee-details/employee-details.component.ts (308 bytes)
CREATE src/app/employee-details/employee-details.component.css (0 bytes)
UPDATE src/app/app.module.ts (629 bytes)

C:\angular6\angular6-springboot-client\src\app>ng g c employee-list
CREATE src/app/employee-list/employee-list.component.html (32 bytes)
CREATE src/app/employee-list/employee-list.component.spec.ts (671 bytes)
CREATE src/app/employee-list/employee-list.component.ts (296 bytes)
CREATE src/app/employee-list/employee-list.component.css (0 bytes)
UPDATE src/app/app.module.ts (737 bytes)

We will use Bootstrap 4 for styling our application so let's integrate bootstrap 4 with angular 6.

Integrate Bootstrap with Angular

Use NPM to download Bootstrap & JQuery. Bootstrap and jQuery will be installed into the node_modules folder.

npm install bootstrap jquery --save

Configure installed Bootstrap & JQuery in an angular.json file:

...
 
"styles": [
  "src/styles.css",
  "node_modules/bootstrap/dist/css/bootstrap.min.css"
],
"scripts": [
  "node_modules/jquery/dist/jquery.min.js",
  "node_modules/bootstrap/dist/js/bootstrap.min.js"
]
 
...

Let's discuss each of the above generate components and service files and we will customize it as per our requirement.

Create Employee class employee.ts

Before defining the EmployeeListComponent, let’s define an Employee class for working with employees. create a new file employee.ts inside src/app folder and add the following code to it -

export class Employee {
    id: number;
    firstName: string;
    lastName: string;
    emailId: string;
    active: boolean;
}

EmployeeService - employee-service.ts

The EmployeeService will be used to get the data from backend by calling spring boot APIs. Update the employee.service.ts file inside src/app directory with the following code to it -

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class EmployeeService {

  private baseUrl = '/api/v1/employees';

  constructor(private http: HttpClient) { }

  getEmployee(id: number): Observable<Object> {
    return this.http.get(`${this.baseUrl}/${id}`);
  }

  createEmployee(employee: Object): Observable<Object> {
    return this.http.post(`${this.baseUrl}`, employee);
  }

  updateEmployee(id: number, value: any): Observable<Object> {
    return this.http.put(`${this.baseUrl}/${id}`, value);
  }

  deleteEmployee(id: number): Observable<any> {
    return this.http.delete(`${this.baseUrl}/${id}`, { responseType: 'text' });
  }

  getEmployeesList(): Observable<any> {
    return this.http.get(`${this.baseUrl}`);
  }
}

EmployeeListComponent - employee-list.component.ts

Let's update the EmployeeListComponent component which will be used to display a list of employee, create a new employee, and delete an employee.

Update/remove the content of todo-list.component.ts inside src/app directory and add the following code to it -

import { Observable } from "rxjs";
import { EmployeeService } from "./../employee.service";
import { Employee } from "./../employee";
import { Component, OnInit } from "@angular/core";

@Component({
  selector: "app-employee-list",
  templateUrl: "./employee-list.component.html",
  styleUrls: ["./employee-list.component.css"]
})
export class EmployeeListComponent implements OnInit {
  employees: Observable<Employee[]>;

  constructor(private employeeService: EmployeeService) {}

  ngOnInit() {
    this.reloadData();
  }

  reloadData() {
    this.employees = this.employeeService.getEmployeesList();
  }

  deleteEmployee(id: number) {
    this.employeeService.deleteEmployee(id)
      .subscribe(
        data => {
          console.log(data);
          this.reloadData();
        },
        error => console.log(error));
  }
}

Create a template for EmployeeListComponent employee-list.component.html

Update employee-list.component.html file with the following code to it -

<div class="panel panel-default">
    <div class="panel-heading">
        <h1>Employees</h1>
    </div>
    <div class="panel-body">
        <table class="table table-striped table-bordered">
            <thead>
                <tr>
                    <th>Firstname</th>
                    <th>Lastname</th>
                    <th>Email</th>
                    <th>Actions</th>
                </tr>
            </thead>
            <tbody>
                <tr *ngFor="let employee of employees | async">
                    <td>{{employee.firstName}}</td>
                    <td>{{employee.lastName}}</td>
                    <td>{{employee.emailId}}</td>
                    <td><button (click)="deleteEmployee(employee.id)">Delete</button></td>
                </tr>
            </tbody>
        </table>
    </div>
</div>

CreateEmployeeComponent - create-employee.component.ts

CreateEmployeeComponent is used to create and handle a new employee form data. Add the following code to it -

import { EmployeeService } from './../employee.service';
import { Employee } from './../employee';
import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'app-create-employee',
  templateUrl: './create-employee.component.html',
  styleUrls: ['./create-employee.component.css']
})
export class CreateEmployeeComponent implements OnInit {

  employee: Employee = new Employee();
  submitted = false;

  constructor(private employeeService: EmployeeService) { }

  ngOnInit() {
  }

  newEmployee(): void {
    this.submitted = false;
    this.employee = new Employee();
  }

  save() {
    this.employeeService.createEmployee(this.employee)
      .subscribe(data => console.log(data), error => console.log(error));
    this.employee = new Employee();
  }

  onSubmit() {
    this.submitted = true;
    this.save();
  }
}

Create a template for EmployeeCreateComponent create-employee.component.html

<h3>Create Employee</h3>
<div [hidden]="submitted" style="width: 400px;">
    <form (ngSubmit)="onSubmit()">
        <div class="form-group">
            <label for="name">First Name</label>
            <input type="text" class="form-control" id="firstName" required [(ngModel)]="employee.firstName" name="firstName">
        </div>

        <div class="form-group">
            <label for="name">Last Name</label>
            <input type="text" class="form-control" id="lastName" required [(ngModel)]="employee.lastName" name="lastName">
        </div>

        <div class="form-group">
            <label for="name">First Name</label>
            <input type="text" class="form-control" id="emailId" required [(ngModel)]="employee.emailId" name="emailId">
        </div>

        <button type="submit" class="btn btn-success">Submit</button>
    </form>
</div>

<div [hidden]="!submitted">
    <h4>You submitted successfully!</h4>
</div>

EmployeeDetailsComponent- employee-details.component.ts

This component shows details of employee -

import { Employee } from './../employee';
import { Component, OnInit, Input } from '@angular/core';
import { EmployeeService } from '../employee.service';
import { EmployeeListComponent } from '../employee-list/employee-list.component';

@Component({
  selector: 'app-employee-details',
  templateUrl: './employee-details.component.html',
  styleUrls: ['./employee-details.component.css']
})
export class EmployeeDetailsComponent implements OnInit {

  @Input() employee: Employee;

  constructor(private employeeService: EmployeeService, private listComponent: EmployeeListComponent) { }

  ngOnInit() {
  }
}

Create a template for EmployeeDetailsComponent employee-details.component.html

<div *ngIf="employee">
    <div>
        <label>Name: </label> {{employee.firstName}}
    </div>
    <div>
        <label>Age: </label> {{employee.lastName}}
    </div>
    <div>
        <label>Active: </label> {{employee.emailId}}
    </div>
    <div>
        <label>Active: </label> {{employee.active}}
    </div>

    <span class="button is-small btn-primary" *ngIf='employee.active' (click)='updateActive(false)'>Inactive</span>

    <span class="button is-small btn-primary" *ngIf='!employee.active' (click)='updateActive(true)'>Active</span>

    <span class="button is-small btn-danger" (click)='deleteEmployee()'>Delete</span>

    <hr/>
</div>

AppRoutingModule - app-routing.module.ts

import { EmployeeDetailsComponent } from './employee-details/employee-details.component';
import { CreateEmployeeComponent } from './create-employee/create-employee.component';
import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { EmployeeListComponent } from './employee-list/employee-list.component';

const routes: Routes = [
  { path: '', redirectTo: 'employee', pathMatch: 'full' },
  { path: 'employees', component: EmployeeListComponent },
  { path: 'add', component: CreateEmployeeComponent },
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

AppComponent - app/app.component.ts

Defines the logic for the app's root component, named AppComponent. The view associated with this root component becomes the root of the view hierarchy as you add components and services to your app.

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'Angular 6 + Spring Boot 2 + Spring Data JPA + MySQL + CRUD Tutorial';
}

app/app.component.html

Defines the HTML template associated with the root AppComponent.

<div class="container">
    <h2>{{title}}</h2>
    <hr>

    <nav class="navbar navbar-expand-sm bg-dark navbar-dark">
        <!-- Links -->
        <ul class="navbar-nav">
            <li class="nav-item">
                <a routerLink="employees" class="btn btn-primary active" role="button" routerLinkActive="active">Employees</a>
            </li>
            <li class="nav-item" style="margin-left: 10px;">
                <a routerLink="add" class="btn btn-primary active" role="button" routerLinkActive="active">Add</a>
            </li>
        </ul>

    </nav>
    <router-outlet></router-outlet>
</div>

app/app.module.ts

Defines the root module, named AppModule, that tells Angular how to assemble the application. Initially declares only the AppComponent. As you add more components to the app, they must be declared here.

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { CreateEmployeeComponent } from './create-employee/create-employee.component';
import { EmployeeDetailsComponent } from './employee-details/employee-details.component';
import { EmployeeListComponent } from './employee-list/employee-list.component';
import { HttpClientModule } from '@angular/common/http';
@NgModule({
  declarations: [
    AppComponent,
    CreateEmployeeComponent,
    EmployeeDetailsComponent,
    EmployeeListComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    FormsModule,
    HttpClientModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Configure a proxy for your API calls with Angular CLI

Here I will show you how to set up your Angular development server and how to configure it to properly communicate with your backend (REST) API.

In a real-world setup where you have your Angular CLI development server running on http://localhost:4200 and your backend API (in whichever technology you like) running on some other port or even host, let’s say http://localhost:8080.

When you then want to execute an HTTP call within the app, you’d have to write something like this, indicating the full path of your backend API.

this.http.get('http://locahost:8080/api/v1/employees')
    .map(res => res.json());

Obviously, the base URL (i.e. the host) can be configured in a central place somewhere, such as via the environment.ts file (that gets generated by the Angular CLI). But there’s another issue as well. Unless you’re creating some publicly consumable API and you inject the required CORS headers, you’ll most probably get some CORS exceptions.

What is the solution? Here is a solution with different options.

Configuring your Angular CLI dev-server proxy

There are different options:

add the proper CORS headers - This is definitely a must in a case when you design a generic API where you don’t even know the consumer.
use a proxy - A proxy is a piece of software which is in between your JavaScript/Angular app doing the Ajax request and your backend API. This is the choice to go in a classic app.

In this example, I have used proxy to configure our Angular CLI dev-server proxy.

To set it up, we need to create a file proxy.conf.json at the root of our Angular CLI project. The content should look as follows:

proxy.conf.json

{
  "/api/v1/employees": {
    "target": "http://localhost:8080",
    "secure": false
  }
}

All requests made to /api/v1/employees from within our application will be forwarded to http://localhost:8080//api/v1/employees

As we already started Spring boot application. Now let's run this Angular 7 application.

Running Angular 6 Application

Let's run the above developed Angular App with a command: npm start

Note that when you execute npm start, ng serve will be invoked which is a command to the CLI to fire up its internal development server.

Output

Open browser for url http://URLalhost:4200/:

Employee List Page

Add Employee Page

Delete Employee

Important: Note that update employee and view employee features covered in Spring Boot + Angular 8 CRUD Example Tutorial.

The source code of this article available on my GitHub repository at https://github.com/RameshMF/angular6-springboot-crud-tutorial

Note: If you still get CORS Issue then refer below section:

Enable CORS on the Server // Important

To enable CORS on the server, add a @CrossOrigin annotation to the EmployeeController.

@CrossOrigin(origins = "http://localhost:4200")
@RestController
@RequestMapping("/api/v1")
public class EmployeeController {
 // ....
}