Spring Boot + Angular 6 example | Spring Data JPA + REST + PostgreSQL CRUD example

In this tutorial, we show you Angular 6 Http Client & Spring Boot Server example that uses Spring JPA to do CRUD with PostgreSQL and Angular 6 as a front-end technology to make request and receive response.

I. Technologies

– Java 1.8
– Maven 3.3.9
– Spring Tool Suite – Version 3.8.4.RELEASE
– Spring Boot: 2.0.3.RELEASE
– Angular 6
– RxJS 6

II. Overview

Demo

1. Spring Boot Server

2. Angular 6 Client

III. Practice

1. Project Structure

1.1 Spring Boot Server

– Customer class corresponds to entity and table customer.
– CustomerRepository is an interface extends CrudRepository, will be autowired in CustomerController for implementing repository methods and custom finder methods.
– CustomerController is a REST Controller which has request mapping methods for RESTful requests such as: getAllCustomers, postCustomer, deleteCustomer, deleteAllCustomers, findByAge, updateCustomer.
– Configuration for Spring Datasource and Spring JPA properties in application.properties
– Dependencies for Spring Boot and PostgreSQL in pom.xml

1.2 Angular 6 Client

In this example, we focus on:
– 4 components: customers-list, customer-details, create-customer, search-customer.
– 3 modules: FormsModule, HttpClientModule, AppRoutingModule.
– customer.ts: class Customer (id, firstName, lastName)
– customer.service.ts: Service for Http Client methods

2. How to do

2.1 Spring Boot Server

2.1.1 Dependency

<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.postgresql</groupId>
	<artifactId>postgresql</artifactId>
	<scope>runtime</scope>
</dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-data-jpa</artifactId>

</dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-web</artifactId>

</dependency>

<groupId>org.postgresql</groupId>

<artifactId>postgresql</artifactId>

<scope>runtime</scope>

</dependency>

2.1.2 Customer – Data Model

model/Customer.java

package com.javasampleapproach.springrest.postgresql.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 = "customer")
public class Customer {

	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private long id;

	@Column(name = "name")
	private String name;

	@Column(name = "age")
	private int age;

	@Column(name = "active")
	private boolean active;

	public Customer() {
	}

	public Customer(String name, int age) {
		this.name = name;
		this.age = age;
		this.active = false;
	}

	public long getId() {
		return id;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getName() {
		return this.name;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public int getAge() {
		return this.age;
	}

	public boolean isActive() {
		return active;
	}

	public void setActive(boolean active) {
		this.active = active;
	}

	@Override
	public String toString() {
		return "Customer [id=" + id + ", name=" + name + ", age=" + age + ", active=" + active + "]";
	}
}

package com.javasampleapproach.springrest.postgresql.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 = "customer")

public class Customer {

@Id

@GeneratedValue(strategy = GenerationType.AUTO)

private long id;

@Column(name = "name")

private String name;

@Column(name = "age")

private int age;

@Column(name = "active")

private boolean active;

public Customer() {

}

public Customer(String name, int age) {

this.name = name;

this.age = age;

this.active = false;

}

public long getId() {

return id;

}

public void setName(String name) {

this.name = name;

}

public String getName() {

return this.name;

}

public void setAge(int age) {

this.age = age;

}

public int getAge() {

return this.age;

}

public boolean isActive() {

return active;

}

public void setActive(boolean active) {

this.active = active;

}

@Override

public String toString() {

return "Customer [id=" + id + ", name=" + name + ", age=" + age + ", active=" + active + "]";

}

2.1.3 JPA Repository

repo/CustomerRepository.java

package com.javasampleapproach.springrest.postgresql.repo;

import java.util.List;

import org.springframework.data.repository.CrudRepository;

import com.javasampleapproach.springrest.postgresql.model.Customer;

public interface CustomerRepository extends CrudRepository<Customer, Long> {
	List<Customer> findByAge(int age);
}

package com.javasampleapproach.springrest.postgresql.repo;

import java.util.List;

import org.springframework.data.repository.CrudRepository;

import com.javasampleapproach.springrest.postgresql.model.Customer;

public interface CustomerRepository extends CrudRepository<Customer, Long> {

List<Customer> findByAge(int age);

}

2.1.4 REST Controller

controller/CustomerController.java

package com.javasampleapproach.springrest.postgresql.controller;

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.CrossOrigin;
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 com.javasampleapproach.springrest.postgresql.model.Customer;
import com.javasampleapproach.springrest.postgresql.repo.CustomerRepository;

@CrossOrigin(origins = "http://localhost:4200")
@RestController
@RequestMapping("/api")
public class CustomerController {

	@Autowired
	CustomerRepository repository;

	@GetMapping("/customers")
	public List<Customer> getAllCustomers() {
		System.out.println("Get all Customers...");

		List<Customer> customers = new ArrayList<>();
		repository.findAll().forEach(customers::add);

		return customers;
	}

	@PostMapping(value = "/customers/create")
	public Customer postCustomer(@RequestBody Customer customer) {

		Customer _customer = repository.save(new Customer(customer.getName(), customer.getAge()));
		return _customer;
	}

	@DeleteMapping("/customers/{id}")
	public ResponseEntity<String> deleteCustomer(@PathVariable("id") long id) {
		System.out.println("Delete Customer with ID = " + id + "...");

		repository.deleteById(id);

		return new ResponseEntity<>("Customer has been deleted!", HttpStatus.OK);
	}

	@DeleteMapping("/customers/delete")
	public ResponseEntity<String> deleteAllCustomers() {
		System.out.println("Delete All Customers...");

		repository.deleteAll();

		return new ResponseEntity<>("All customers have been deleted!", HttpStatus.OK);
	}

	@GetMapping(value = "customers/age/{age}")
	public List<Customer> findByAge(@PathVariable int age) {

		List<Customer> customers = repository.findByAge(age);
		return customers;
	}

	@PutMapping("/customers/{id}")
	public ResponseEntity<Customer> updateCustomer(@PathVariable("id") long id, @RequestBody Customer customer) {
		System.out.println("Update Customer with ID = " + id + "...");

		Optional<Customer> customerData = repository.findById(id);

		if (customerData.isPresent()) {
			Customer _customer = customerData.get();
			_customer.setName(customer.getName());
			_customer.setAge(customer.getAge());
			_customer.setActive(customer.isActive());
			return new ResponseEntity<>(repository.save(_customer), HttpStatus.OK);
		} else {
			return new ResponseEntity<>(HttpStatus.NOT_FOUND);
		}
	}
}

package com.javasampleapproach.springrest.postgresql.controller;

import java.util.ArrayList;

import java.util.List;

import java.util.Optional;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.http.HttpStatus;

import org.springframework.http.ResponseEntity;

import org.springframework.web.bind.annotation.CrossOrigin;

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 com.javasampleapproach.springrest.postgresql.model.Customer;

import com.javasampleapproach.springrest.postgresql.repo.CustomerRepository;

@CrossOrigin(origins = "http://localhost:4200")

@RestController

@RequestMapping("/api")

public class CustomerController {

@Autowired

CustomerRepository repository;

@GetMapping("/customers")

public List<Customer> getAllCustomers() {

System.out.println("Get all Customers...");

List<Customer> customers = new ArrayList<>();

repository.findAll().forEach(customers::add);

return customers;

}

@PostMapping(value = "/customers/create")

public Customer postCustomer(@RequestBody Customer customer) {

Customer _customer = repository.save(new Customer(customer.getName(), customer.getAge()));

return _customer;

}

@DeleteMapping("/customers/{id}")

public ResponseEntity<String> deleteCustomer(@PathVariable("id") long id) {

System.out.println("Delete Customer with ID = " + id + "...");

repository.deleteById(id);

return new ResponseEntity<>("Customer has been deleted!", HttpStatus.OK);

}

@DeleteMapping("/customers/delete")

public ResponseEntity<String> deleteAllCustomers() {

System.out.println("Delete All Customers...");

repository.deleteAll();

return new ResponseEntity<>("All customers have been deleted!", HttpStatus.OK);

}

@GetMapping(value = "customers/age/{age}")

public List<Customer> findByAge(@PathVariable int age) {

List<Customer> customers = repository.findByAge(age);

return customers;

}

@PutMapping("/customers/{id}")

public ResponseEntity<Customer> updateCustomer(@PathVariable("id") long id, @RequestBody Customer customer) {

System.out.println("Update Customer with ID = " + id + "...");

Optional<Customer> customerData = repository.findById(id);

if (customerData.isPresent()) {

Customer _customer = customerData.get();

_customer.setName(customer.getName());

_customer.setAge(customer.getAge());

_customer.setActive(customer.isActive());

return new ResponseEntity<>(repository.save(_customer), HttpStatus.OK);

} else {

return new ResponseEntity<>(HttpStatus.NOT_FOUND);

}

2.1.5 Configuration for Spring Datasource & JPA properties

application.properties

spring.datasource.url=jdbc:postgresql://localhost/testdb
spring.datasource.username=postgres
spring.datasource.password=123
spring.jpa.generate-ddl=true

spring.datasource.url=jdbc:postgresql://localhost/testdb

spring.datasource.username=postgres

spring.datasource.password=123

spring.jpa.generate-ddl=true

2.2 Angular 6 Client

2.2.0 Create Service & Components

Run commands below:
– ng g s customer
– ng g c create-customer
– ng g c customer-details
– ng g c customers-list
– ng g c search-customers
On each Component selector, delete app- prefix, then change tslint.json rules – "component-selector" to false.

2.2.1 Model

customer.ts

export class Customer {
    id: number;
    name: string;
    age: number;
    active: boolean;
}

export class Customer {

id: number;

name: string;

age: number;

active: boolean;

}

2.2.2 CustomerService

customer.service.ts

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

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

  private baseUrl = 'http://localhost:8080/api/customers';

  constructor(private http: HttpClient) { }

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

  createCustomer(customer: Object): Observable<Object> {
    return this.http.post(`${this.baseUrl}` + `/create`, customer);
  }

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

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

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

  getCustomersByAge(age: number): Observable<any> {
    return this.http.get(`${this.baseUrl}/age/${age}`);
  }

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

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

import { HttpClient } from '@angular/common/http';

import { Observable } from 'rxjs';

@Injectable({

providedIn: 'root'

})

export class CustomerService {

private baseUrl = 'http://localhost:8080/api/customers';

constructor(private http: HttpClient) { }

getCustomer(id: number): Observable<Object> {

return this.http.get(`${this.baseUrl}/${id}`);

}

createCustomer(customer: Object): Observable<Object> {

return this.http.post(`${this.baseUrl}` + `/create`, customer);

}

updateCustomer(id: number, value: any): Observable<Object> {

return this.http.put(`${this.baseUrl}/${id}`, value);

}

deleteCustomer(id: number): Observable<any> {

return this.http.delete(`${this.baseUrl}/${id}`, { responseType: 'text' });

}

getCustomersList(): Observable<any> {

return this.http.get(`${this.baseUrl}`);

}

getCustomersByAge(age: number): Observable<any> {

return this.http.get(`${this.baseUrl}/age/${age}`);

}

deleteAll(): Observable<any> {

return this.http.delete(`${this.baseUrl}` + `/delete`, { responseType: 'text' });

}

2.2.3 Components

– CustomerDetailsComponent:
customer-details/customer-details.component.ts

import { Component, OnInit, Input } from '@angular/core';
import { CustomerService } from '../customer.service';
import { Customer } from '../customer';

import { CustomersListComponent } from '../customers-list/customers-list.component';

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

  @Input() customer: Customer;

  constructor(private customerService: CustomerService, private listComponent: CustomersListComponent) { }

  ngOnInit() {
  }

  updateActive(isActive: boolean) {
    this.customerService.updateCustomer(this.customer.id,
      { name: this.customer.name, age: this.customer.age, active: isActive })
      .subscribe(
        data => {
          console.log(data);
          this.customer = data as Customer;
        },
        error => console.log(error));
  }

  deleteCustomer() {
    this.customerService.deleteCustomer(this.customer.id)
      .subscribe(
        data => {
          console.log(data);
          this.listComponent.reloadData();
        },
        error => console.log(error));
  }
}

import { Component, OnInit, Input } from '@angular/core';

import { CustomerService } from '../customer.service';

import { Customer } from '../customer';

import { CustomersListComponent } from '../customers-list/customers-list.component';

@Component({

selector: 'customer-details',

templateUrl: './customer-details.component.html',

styleUrls: ['./customer-details.component.css']

})

export class CustomerDetailsComponent implements OnInit {

@Input() customer: Customer;

constructor(private customerService: CustomerService, private listComponent: CustomersListComponent) { }

ngOnInit() {

}

updateActive(isActive: boolean) {

this.customerService.updateCustomer(this.customer.id,

{ name: this.customer.name, age: this.customer.age, active: isActive })

.subscribe(

data => {

console.log(data);

this.customer = data as Customer;

error => console.log(error));

}

deleteCustomer() {

this.customerService.deleteCustomer(this.customer.id)

.subscribe(

data => {

console.log(data);

this.listComponent.reloadData();

error => console.log(error));

}

customer-details/customer-details.component.html

<div *ngIf="customer">
  <div>
    <label>Name: </label> {{customer.name}}
  </div>
  <div>
    <label>Age: </label> {{customer.age}}
  </div>
  <div>
    <label>Active: </label> {{customer.active}}
  </div>

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

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

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

  <hr/>
</div>

<div>

<label>Name: </label> {{customer.name}}

</div>

<div>

<label>Age: </label> {{customer.age}}

</div>

<div>

<label>Active: </label> {{customer.active}}

</div>

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

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

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

<hr/>

</div>

– CustomersListComponent:
customers-list/customers-list.component.ts

import { Component, OnInit } from '@angular/core';
import { Observable } from 'rxjs';

import { CustomerService } from '../customer.service';
import { Customer } from '../customer';

@Component({
  selector: 'customers-list',
  templateUrl: './customers-list.component.html',
  styleUrls: ['./customers-list.component.css']
})
export class CustomersListComponent implements OnInit {

  customers: Observable<Customer[]>;

  constructor(private customerService: CustomerService) { }

  ngOnInit() {
    this.reloadData();
  }

  deleteCustomers() {
    this.customerService.deleteAll()
      .subscribe(
        data => {
          console.log(data);
          this.reloadData();
        },
        error => console.log('ERROR: ' + error));
  }

  reloadData() {
    this.customers = this.customerService.getCustomersList();
  }
}

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

import { Observable } from 'rxjs';

import { CustomerService } from '../customer.service';

import { Customer } from '../customer';

@Component({

selector: 'customers-list',

templateUrl: './customers-list.component.html',

styleUrls: ['./customers-list.component.css']

})

export class CustomersListComponent implements OnInit {

customers: Observable<Customer[]>;

constructor(private customerService: CustomerService) { }

ngOnInit() {

this.reloadData();

}

deleteCustomers() {

this.customerService.deleteAll()

.subscribe(

data => {

console.log(data);

this.reloadData();

error => console.log('ERROR: ' + error));

}

reloadData() {

this.customers = this.customerService.getCustomersList();

}

customers-list/customers-list.component.html

<h1>Customers</h1>

<div *ngFor="let customer of customers | async" style="width: 300px;">
  <customer-details [customer]='customer'></customer-details>
</div>

<div>
  <button type="button" class="button btn-danger" (click)='deleteCustomers()'>Delete All</button>
</div>

<h1>Customers</h1>

<customer-details [customer]='customer'></customer-details>

</div>

<div>

<button type="button" class="button btn-danger" (click)='deleteCustomers()'>Delete All</button>

</div>

– CreateCustomerComponent:
create-customer/create-customer.component.ts

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

import { Customer } from '../customer';
import { CustomerService } from '../customer.service';

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

  customer: Customer = new Customer();
  submitted = false;

  constructor(private customerService: CustomerService) { }

  ngOnInit() {
  }

  newCustomer(): void {
    this.submitted = false;
    this.customer = new Customer();
  }

  save() {
    this.customerService.createCustomer(this.customer)
      .subscribe(data => console.log(data), error => console.log(error));
    this.customer = new Customer();
  }

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

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

import { Customer } from '../customer';

import { CustomerService } from '../customer.service';

@Component({

selector: 'create-customer',

templateUrl: './create-customer.component.html',

styleUrls: ['./create-customer.component.css']

})

export class CreateCustomerComponent implements OnInit {

customer: Customer = new Customer();

submitted = false;

constructor(private customerService: CustomerService) { }

ngOnInit() {

}

newCustomer(): void {

this.submitted = false;

this.customer = new Customer();

}

save() {

this.customerService.createCustomer(this.customer)

.subscribe(data => console.log(data), error => console.log(error));

this.customer = new Customer();

}

onSubmit() {

this.submitted = true;

this.save();

}

create-customer/create-customer.component.html

<h3>Create Customer</h3>
<div [hidden]="submitted" style="width: 300px;">
  <form (ngSubmit)="onSubmit()">
    <div class="form-group">
      <label for="name">Name</label>
      <input type="text" class="form-control" id="name" required [(ngModel)]="customer.name" name="name">
    </div>

    <div class="form-group">
      <label for="age">Age</label>
      <input type="text" class="form-control" id="age" required [(ngModel)]="customer.age" name="age">
    </div>

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

<div [hidden]="!submitted">
  <h4>You submitted successfully!</h4>
  <button class="btn btn-success" (click)="newCustomer()">Add</button>
</div>

<h3>Create Customer</h3>

</div>

</div>

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

</form>

</div>

<h4>You submitted successfully!</h4>

</div>

– SearchCustomersComponent:
search-customers/search-customers.component.ts

import { Component, OnInit } from '@angular/core';
import { Customer } from '../customer';
import { CustomerService } from '../customer.service';

@Component({
  selector: 'search-customers',
  templateUrl: './search-customers.component.html',
  styleUrls: ['./search-customers.component.css']
})
export class SearchCustomersComponent implements OnInit {

  age: number;
  customers: Customer[];

  constructor(private dataService: CustomerService) { }

  ngOnInit() {
    this.age = 0;
  }

  private searchCustomers() {
    this.dataService.getCustomersByAge(this.age)
      .subscribe(customers => this.customers = customers);
  }

  onSubmit() {
    this.searchCustomers();
  }
}

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

import { Customer } from '../customer';

import { CustomerService } from '../customer.service';

@Component({

selector: 'search-customers',

templateUrl: './search-customers.component.html',

styleUrls: ['./search-customers.component.css']

})

export class SearchCustomersComponent implements OnInit {

age: number;

customers: Customer[];

constructor(private dataService: CustomerService) { }

ngOnInit() {

this.age = 0;

}

private searchCustomers() {

this.dataService.getCustomersByAge(this.age)

.subscribe(customers => this.customers = customers);

}

onSubmit() {

this.searchCustomers();

}

search-customers/search-customers.component.html

<h3>Find By Age</h3>
<div style="width: 300px;">
  <form (ngSubmit)="onSubmit()">
    <div class="form-group">
      <label for="lastname">Age</label>
      <input type="text" class="form-control" id="age" required [(ngModel)]="age" name="age">
    </div>

    <div class="btn-group">
      <button type="submit" class="btn btn-success">Submit</button>
    </div>
  </form>
</div>
<ul>
  <li *ngFor="let customer of customers">
    <h4>{{customer.id}} - {{customer.name}} {{customer.age}}</h4>
  </li>
</ul>

</div>

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

</div>

</form>

</div>

<ul>

<h4>{{customer.id}} - {{customer.name}} {{customer.age}}</h4>

</li>

</ul>

2.2.4 AppRoutingModule

app-routing.module.ts

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { CustomersListComponent } from './customers-list/customers-list.component';
import { CreateCustomerComponent } from './create-customer/create-customer.component';
import { SearchCustomersComponent } from './search-customers/search-customers.component';

const routes: Routes = [
    { path: '', redirectTo: 'customer', pathMatch: 'full' },
    { path: 'customer', component: CustomersListComponent },
    { path: 'add', component: CreateCustomerComponent },
    { path: 'findbyage', component: SearchCustomersComponent },
];

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

export class AppRoutingModule { }

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

import { RouterModule, Routes } from '@angular/router';

import { CustomersListComponent } from './customers-list/customers-list.component';

import { CreateCustomerComponent } from './create-customer/create-customer.component';

import { SearchCustomersComponent } from './search-customers/search-customers.component';

const routes: Routes = [

{ path: '', redirectTo: 'customer', pathMatch: 'full' },

{ path: 'customer', component: CustomersListComponent },

{ path: 'add', component: CreateCustomerComponent },

{ path: 'findbyage', component: SearchCustomersComponent },

];

@NgModule({

imports: [RouterModule.forRoot(routes)],

exports: [RouterModule]

})

export class AppRoutingModule { }

And AppComponent HTML for routing:
app.component.html

<div style="padding: 20px;">
  <h1 style="color: blue">{{title}}</h1>
  <h3>{{description}}</h3>
  <nav>
    <a routerLink="customer" class="btn btn-primary active" role="button" routerLinkActive="active">Customers</a>
    <a routerLink="add" class="btn btn-primary active" role="button" routerLinkActive="active">Add</a>
    <a routerLink="findbyage" class="btn btn-primary active" role="button" routerLinkActive="active">Search</a>
  </nav>
  <router-outlet></router-outlet>
</div>

<h1 style="color: blue">{{title}}</h1>

<h3>{{description}}</h3>

<nav>

<a routerLink="customer" class="btn btn-primary active" role="button" routerLinkActive="active">Customers</a>

<a routerLink="findbyage" class="btn btn-primary active" role="button" routerLinkActive="active">Search</a>

</nav>

<router-outlet></router-outlet>

</div>

2.2.5 AppModule

app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';

import { AppComponent } from './app.component';
import { CreateCustomerComponent } from './create-customer/create-customer.component';
import { CustomerDetailsComponent } from './customer-details/customer-details.component';
import { CustomersListComponent } from './customers-list/customers-list.component';
import { SearchCustomersComponent } from './search-customers/search-customers.component';
import { AppRoutingModule } from './app-routing.module';
import { HttpClientModule } from '@angular/common/http';

@NgModule({
  declarations: [
    AppComponent,
    CreateCustomerComponent,
    CustomerDetailsComponent,
    CustomersListComponent,
    SearchCustomersComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    AppRoutingModule,
    HttpClientModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

import { BrowserModule } from '@angular/platform-browser';

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

import { FormsModule } from '@angular/forms';

import { AppComponent } from './app.component';

import { CreateCustomerComponent } from './create-customer/create-customer.component';

import { CustomerDetailsComponent } from './customer-details/customer-details.component';

import { CustomersListComponent } from './customers-list/customers-list.component';

import { SearchCustomersComponent } from './search-customers/search-customers.component';

import { AppRoutingModule } from './app-routing.module';

import { HttpClientModule } from '@angular/common/http';

@NgModule({

declarations: [

AppComponent,

CreateCustomerComponent,

CustomerDetailsComponent,

CustomersListComponent,

SearchCustomersComponent

imports: [

BrowserModule,

FormsModule,

AppRoutingModule,

HttpClientModule

providers: [],

bootstrap: [AppComponent]

})

export class AppModule { }

3. Run & Check Result

– Build and Run Spring Boot project with commandlines: mvn clean install and mvn spring-boot:run.
– Run the Angular App with command: ng serve.

– Open browser for url http://localhost:4200/:
Add Customer:

Show Customers:

Click on Active button to update Customer status:

Search Customers by Age:

Delete a Customer:

Delete All Customers:

IV. Source Code

– Angular6SpringBoot-Client
– SpringRESTPostgreSQL-Server

By grokonez | June 21, 2018.

Last updated on November 2, 2018.

3 thoughts on “Spring Boot + Angular 6 example | Spring Data JPA + REST + PostgreSQL CRUD example”

Paweł says:
November 30, 2018 at 7:58 pm
I’m beginner and I’m trying to follow your tutorial. One thing puzzled me: why in CustomerController inside postCustomer method you saved Customer like this:
repository.save(new Customer(customer.getName(), customer.getAge()));
1
repository.save(new Customer(customer.getName(), customer.getAge()));
instead of just simply:
repository.save(customer)
1
repository.save(customer)
(object from method parameter)?
1. grokonez says:
  December 2, 2018 at 3:56 am
  Hi Pawel,
  Please look at the constructor method of Customer class:
  public Customer(String name, int age) { this.name = name; this.age = age; this.active = false; }
  1
  2
  3
  4
  5
  public Customer(String name, int age) {
    this.name = name;
    this.age = age;
    this.active = false;
  }
  You can see that we specify the value of active field, and not mention the value of id field (that will be generated automatically by JPA), if you use the customer from input param of the function:
  public Customer postCustomer(@RequestBody Customer customer) {...}
  1
  public Customer postCustomer(@RequestBody Customer customer) {...}
  customer.active field could be true by the input 🙂
  Regards,
  grokonez.
  1. Paweł says:
    December 2, 2018 at 4:25 pm
    Thanks for explanation 🙂

Spring Boot + Angular 6 example | Spring Data JPA + REST + PostgreSQL CRUD example

I. Technologies

II. Overview

Demo

1. Spring Boot Server

2. Angular 6 Client

III. Practice

1. Project Structure

1.1 Spring Boot Server

1.2 Angular 6 Client

2. How to do

2.1 Spring Boot Server

2.1.1 Dependency

2.1.2 Customer – Data Model

2.1.3 JPA Repository

2.1.4 REST Controller

2.1.5 Configuration for Spring Datasource & JPA properties

2.2 Angular 6 Client

2.2.0 Create Service & Components

2.2.1 Model

2.2.2 CustomerService

2.2.3 Components

2.2.4 AppRoutingModule

2.2.5 AppModule

3. Run & Check Result

IV. Source Code

Post Tags

3 thoughts on “Spring Boot + Angular 6 example | Spring Data JPA + REST + PostgreSQL CRUD example”

Got Something To Say: Cancel reply

I. Technologies

II. Overview

Demo

1. Spring Boot Server

2. Angular 6 Client

III. Practice

1. Project Structure

1.1 Spring Boot Server

1.2 Angular 6 Client

2. How to do

2.1 Spring Boot Server

2.1.1 Dependency

2.1.2 Customer – Data Model

2.1.3 JPA Repository

2.1.4 REST Controller

2.1.5 Configuration for Spring Datasource & JPA properties

2.2 Angular 6 Client

2.2.0 Create Service & Components

2.2.1 Model

2.2.2 CustomerService

2.2.3 Components

2.2.4 AppRoutingModule

2.2.5 AppModule

3. Run & Check Result

IV. Source Code

Related Posts

Post Tags

3 thoughts on “Spring Boot + Angular 6 example | Spring Data JPA + REST + PostgreSQL CRUD example”

Got Something To Say: Cancel reply