Spring Boot (Building a web application - JPA integration) - Part 3
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);
}
}
That's it.
Just run the application and you will see it working.
Checkout the full code on my github.
