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Spring Boot (Building a web application - JPA integration) - Part 3

namom(25)

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This is the third part of our Spring Boot application.

Spring Boot (Introduction) - Part 1
Spring Boot (Building a web application - Running) - Part 2
Spring Boot (Building a web application - JPA integration) - Part 3
Spring Boot (Increasing your productivity with Spring devtools) - Part 4
Spring Boot (Building a standalone library) - Part 5
Spring Boot (Generating a FATJAR) - Part 6
Spring Boot (Publishing at AWS) - Part 7

The application is going to be called "My List" and it is a simple to-do list and task manager that helps you get stuff done. Whether you’re sharing a grocery list with a loved one, working on a project, or planning a vacation.

At this part we are going to build our List Domain wich means that we'll be able to create as many lists as we want.

First, lets create a List Domain. In this case we will create an Entity called "ListDomain". Our list is gonna have and Id, a name and a date.


import java.io.Serializable;
import java.util.Date;
import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.GenerationType;

import javax.persistence.Id;
import lombok.Data;
@Entity

@Data

public class ListDomain implements Serializable {

private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;

private String name;

private Date date;

public ListDomain(String name) {
    this.name = name;
    this.date = new Date();
}

public ListDomain() {
}

}

Second, lets create an interface to be able to connect our list to the data base.


import org.springframework.data.jpa.repository.JpaRepository;
import br.com.namom.todolist.domain.ListDomain;
public interface ListRepository extends JpaRepository<ListDomain, Long> {
}

Third, before to create our controller, lets create our view part. We have created a simple index page that you can find here. Then, we have to create another page to handle our list, i.e, a page where we can create and list them.

Fouth, now lets create our controller. It is resposible to manage our routes, list and save our objects.


import javax.transaction.Transactional;
import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

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

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

import org.springframework.web.bind.annotation.RequestParam;
import br.com.namom.todolist.domain.ListDomain;

import br.com.namom.todolist.persistence.ListRepository;
@Controller

public class ListController {
@Autowired
private ListRepository repoList;

@Transactional
@RequestMapping("mylists")
public String lists(Model model) {
    Iterable lists = repoList.findAll();
    model.addAttribute("lists", lists);
    return "lists";
}

@RequestMapping("")
public String index(Model model) {
    return "index";
}

@Transactional
@RequestMapping(value = "savelist", method = RequestMethod.POST)
public String save(@RequestParam("name") String name, Model model) {
    ListDomain list = new ListDomain(name);
    repoList.save(list);
    return this.lists(model);
}

}