Connessione a MongoDB in Vaadin con Java, Spring Boot e Flow

In questo articolo vediamo come connetterci a MongoDB in Vaadin e Flow.

Sto usando solo MongoDB, quindi ho levato tutti i riferimenti ad altri db, librerie su Maven comprese.

Questa la dipendenza che dovete aggiungere:

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>

Questa la configurazione nell'application.properties:

server.port=${PORT:8080}
logging.level.org.atmosphere=warn
spring.mustache.check-template-location=false
# Launch the default browser when starting the application in development mode
vaadin.launch-browser=true
# MongoDB configuration
spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.data.mongodb.database=testdb
# Vaadin configuration
vaadin.allowed-packages=com.vaadin,org.vaadin,com.test

Questa l'entity:

package com.test.data;

import lombok.Getter;
import lombok.Setter;
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;

import java.util.List;

@Setter
@Getter
@Document(collection = "libri")
public class Libro {

  @Id
  private String id;

  private String titolo;

  private List<String> categorie;

}

Il repository:

package com.test.data;

import org.springframework.data.mongodb.repository.MongoRepository;

public interface LibroRepository extends MongoRepository<Libro, String> {
}

Il service:

package com.test.services;

import com.test.data.Libro;
import com.test.data.LibroRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;

@Service
public class LibroService {

  @Autowired
  private LibroRepository repository;

  public Page<Libro> getAll(Pageable pageable) {
    return repository.findAll(pageable);
  }

  public void add(Libro libro) {
    repository.save(libro);
  }
}

La view:

package com.test.views.myview;

import com.test.data.Libro;
import com.test.services.LibroService;
import com.vaadin.flow.component.Composite;
import com.vaadin.flow.component.dependency.Uses;
import com.vaadin.flow.component.grid.Grid;
import com.vaadin.flow.component.grid.GridVariant;
import com.vaadin.flow.component.icon.Icon;
import com.vaadin.flow.component.orderedlayout.VerticalLayout;
import com.vaadin.flow.router.PageTitle;
import com.vaadin.flow.router.Route;
import com.vaadin.flow.spring.data.VaadinSpringDataHelpers;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.List;

@PageTitle("Libri")
@Route("/")
@Uses(Icon.class)
@Component
public class LibriView extends Composite<VerticalLayout> {

  private final LibroService libroService;

  public LibriView(LibroService libroService) {
    this.libroService = libroService;

    Libro libro1 = new Libro();
    libro1.setTitolo("IT");
    libro1.setCategorie(List.of("Horror", "Fantasy"));

    Libro libro2 = new Libro();
    libro2.setTitolo("Sahara");
    libro2.setCategorie(List.of("Avventura"));

    libroService.add(libro1);
    libroService.add(libro2);

    Grid<Libro> grid = new Grid<>(Libro.class);
    getContent().setWidth("100%");
    getContent().getStyle().set("flex-grow", "1");
    grid.addThemeVariants(GridVariant.LUMO_ROW_STRIPES);
    grid.setWidth("100%");
    grid.getStyle().set("flex-grow", "0");
    grid.setItems(query -> libroService.getAll(VaadinSpringDataHelpers.toSpringPageRequest(query)).stream());
    getContent().add(grid);
  }
}

Infine l'entry point:

package com.test;

import com.vaadin.flow.component.page.AppShellConfigurator;
import com.vaadin.flow.theme.Theme;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@Theme(value = "test-vaadin-flow")
public class Application implements AppShellConfigurator {

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

Enjoy!