Spring Boot + Angular 6 example | Spring Data + REST + Cassandra CRUD example

In this tutorial, we show you Angular 6 Http Client & Spring Boot Server example that uses Spring Data to do CRUD with Cassandra 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

angular-http-service-architecture

1. Spring Boot Server

spring-boot-angular-6-spring-rest-api-data-cassandra-spring-server-architecture

2. Angular 6 Client

spring-boot-angular-6-spring-rest-api-data-cassandra-angular-client-architecture

III. Practice

1. Project Structure

1.1 Spring Boot Server

spring-boot-angular-6-spring-rest-api-data-cassandra-spring-server-structure

– Customer class corresponds to entity and table customer.
– CustomerRepository is an interface extends CassandraRepository, 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 Cassandra in pom.xml

1.2 Angular 6 Client

spring-boot-angular-6-spring-rest-api-data-cassandra-angular-client-structure
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

2.0 Set up Cassandra

Open Cassandra CQL Shell:

– Create Cassandra keyspace with name javasampleapproach:

create keyspace javasampleapproach with replication={'class':'SimpleStrategy', 'replication_factor':1};

– Create customer table for javasampleapproach keyspace:

use javasampleapproach;

CREATE TABLE customer(
   id timeuuid PRIMARY KEY,
   name text,
   age int,
   active boolean
);
2.1 Spring Boot Server
2.1.1 Dependency

	org.springframework.boot
	spring-boot-starter-data-cassandra



	org.springframework.boot
	spring-boot-starter-web
2.1.2 Customer – Data Model

model/Customer.java

package com.javasampleapproach.springrest.cassandra.model;

import java.util.UUID;

import org.springframework.data.cassandra.core.mapping.PrimaryKey;
import org.springframework.data.cassandra.core.mapping.Table;

@Table
public class Customer {

	@PrimaryKey
	private UUID id;

	private String name;
	private int age;
	private boolean active;

	public Customer() {
	}

	public UUID getId() {
		return id;
	}

	public void setId(UUID id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

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

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = 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 Repository

repo/CustomerRepository.java

package com.javasampleapproach.springrest.cassandra.repo;

import java.util.List;
import java.util.UUID;

import org.springframework.data.cassandra.repository.CassandraRepository;

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

public interface CustomerRepository extends CassandraRepository {
	List findByAge(int age);
}
2.1.4 REST Controller

controller/CustomerController.java

package com.javasampleapproach.springrest.cassandra.controller;

import java.util.List;
import java.util.Optional;
import java.util.UUID;

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.datastax.driver.core.utils.UUIDs;
import com.javasampleapproach.springrest.cassandra.model.Customer;
import com.javasampleapproach.springrest.cassandra.repo.CustomerRepository;

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

	@Autowired
	CustomerRepository repository;

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

		return repository.findAll();
	}

	@PostMapping("/customers/create")
	public ResponseEntity postCustomer(@RequestBody Customer customer) {
		System.out.println("Create Customer: " + customer.getName() + "...");

		customer.setId(UUIDs.timeBased());
		Customer _customer = repository.save(customer);
		return new ResponseEntity<>(_customer, HttpStatus.OK);
	}

	@DeleteMapping("/customers/{id}")
	public ResponseEntity deleteCustomer(@PathVariable("id") UUID 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 deleteAllCustomers() {
		System.out.println("Delete All Customers...");

		repository.deleteAll();

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

	@GetMapping("customers/age/{age}")
	public List findByAge(@PathVariable int age) {

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

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

		Optional 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.data.cassandra.keyspace-name=javasampleapproach
spring.data.cassandra.contact-points=127.0.0.1
spring.data.cassandra.port=9042
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;
}
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 {
    return this.http.get(`${this.baseUrl}/${id}`);
  }

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

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

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

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

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

  deleteAll(): Observable {
    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));
  }
}



customer-details/customer-details.component.html



  

     {{customer.name}}
  

  

     {{customer.age}}
  

  

     {{customer.active}}
  


  Inactive

  Active

  Delete

  






– 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;

  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


Customers




  





  





– 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();
  }
}



create-customer/create-customer.component.html


Create Customer



  

    

      
      
    


    

      
      
    


    
  






  
You submitted successfully!

  





– 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();
  }
}



search-customers/search-customers.component.html


Find By Age



  

    

      
      
    


    

      
    

  




    
  
  • 
    
    {{customer.id}} - {{customer.name}} {{customer.age}}
    
  
    • 





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 { }



And AppComponent HTML for routing:

app.component.html



  
{{title}}

  
{{description}}

  
  





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 { }



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:


spring-boot-angular-6-spring-rest-api-data-cassandra-add-customer


Show Customers:


spring-boot-angular-6-spring-rest-api-data-cassandra-show-customers


Click on Active button to update Customer status:


spring-boot-angular-6-spring-rest-api-data-cassandra-update-customers


Search Customers by Age:


spring-boot-angular-6-spring-rest-api-data-cassandra-search-customers


Delete a Customer:


spring-boot-angular-6-spring-rest-api-data-cassandra-delete-customer


Delete All Customers:


spring-boot-angular-6-spring-rest-api-data-cassandra-delete-all-customers


IV. Source Code


– Angular6SpringBoot-Client

– SpringRestCassandra-Server









	

	





			

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


		
		
    
					
  1. 
			
		
    2. 
		
  2. 
			
    
				

				
    
					
    Heya! I just wanted to ask if you ever have any problems with hackers? My last blog (wordpress) was hacked and I ended up losing months of hard work due to no data backup. Do you have any methods to stop hackers?
    
				
    

				
    Reply
    			
    
		
    3. 
		
  3. 
			
    
				

				
    
					
    Very great post. I simply stumbled upon your weblog and wished to mention that I have truly loved surfing around your blog posts. In any case I’ll be subscribing to your feed and I am hoping you write once more very soon!
    
				
    

				
    Reply
    			
    
		
    4. 
		


		
	
	
		

		
Leave a Reply 
Your email address will not be published. Required fields are marked *
 
 



 


 


	

	



	
	

	



	

		

		
	


















    

		

			ozenero
		

		

		
	
			ozenero.com is a one stop blog for software developers looking for simple, feasible, practical and integrative guides and tutorials on Programming languages, Mobile & Web Development (Java, Kotlin, Python, Golang, JavaScript, Spring Boot, Django, Nodejs, Angular, React and Vue.js).
		


			



Written by Loi Le.

Visit us at: loizenai.com

20B Hoang Dieu Street, 10 Ward , Phu Nhuan, Ho Chi Minh City

Viet Nam


			



			
	
				© 2020 ozenero. All rights reserved | Privacy-Policy
			

		

			 DMCA.com Protection Status  
		

		

	

	
	

		

			Follow Me
		

		

		

			

			 Facebook 
			 Youtube 
			 Twitter 
             Github 

			

		

	

	

		

			About us
		

		

		

		
We are software engineers with many years working experiments in software development industry, we strongly believe the growth of the Internet and Technology.

		
Having a big passion about Internet for connecting knowledge and helping people to resolve problems, so I decide to execute the working place to share and develop my knowledge from year to year!
		

        
Contact me : leloizenai@gmail.com