In this tutorial, we will learn how to use DTO (Data Transfer Object) pattern in Spring Boot application.
Martin Fowler describes the Data Transfer Object in his famous book Patterns of Enterprise Application Architecture.
There, the main idea of DTOs is to reduce the number of remote calls that are expensive. In Java applications - we use JPA entity classes to represent tables in a relational database. Without DTOs, we'd have to expose the entire entities to a remote interface. This causes a strong coupling between an API and a persistence model.
By using a DTO to transfer just the required information, we loosen the coupling between the API and our model, allowing us to more easily maintain and scale the service.
Let's implement Spring Boot DTO Example step by step.
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Technologies usedJava 11 Spring Boot Spring Data JPA (Hibernate) H2 in-memory database Maven Lombok Eclipse STS IDE 1. Create Spring Boot Project We’ll use Spring initializr web tool to bootstrap our application.
Go to http://start.spring.io
Select Java in the language section.
Enter Artifact as spring-dto-tutorial
Add Spring Web , Lombok , Spring Data JPA , and H2 dependencies.
Click Generate to generate and download the project.
Once the project is generated, unzip it and import it into your favorite IDE.
2. Maven Dependencies Open the pom.xml file and confirm below dependencies are present:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.5.4</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>net.javaguides</groupId>
<artifactId>springboot-dto-tutorial</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springboot-dto-tutorial</name>
<description>Demo project for Spring Boot and DTO</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<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>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.modelmapper/modelmapper -->
<dependency>
<groupId>org.modelmapper</groupId>
<artifactId>modelmapper</artifactId>
<version>2.4.4</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
</project>
3. Model Layer Let's create User and Location JPA entities and establish many-to-one relationship between them.
User JPA Entity package net.javaguides.springboot.model;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import javax.persistence.*;
@Data
@NoArgsConstructor
@AllArgsConstructor
@Entity
@Table(name = "users")
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
private String email;
@Column(name = "first_name")
private String firstName;
@Column(name = "last_name")
private String lastName;
private String password;
@ManyToOne(fetch = FetchType.EAGER, optional = false)
@JoinColumn(name = "location_id")
private Location location;
}
Location JPA Entity package net.javaguides.springboot.model;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import javax.persistence.*;
@Data
@NoArgsConstructor
@AllArgsConstructor
@Entity
@Table(name = "locations")
public class Location {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
private String place;
private String description;
private double longitude;
private double latitude;
}
4. Repository Layer Let's create Spring Data JPA repositories to talk with database.
UserRepository package net.javaguides.springboot.repository;
import net.javaguides.springboot.model.User;
import org.springframework.data.jpa.repository.JpaRepository;
public interface UserRepository extends JpaRepository<User, Long> {
}
LocationRepository package net.javaguides.springboot.repository;
import net.javaguides.springboot.model.Location;
import org.springframework.data.jpa.repository.JpaRepository;
public interface LocationRepository extends JpaRepository<Location, Long> {
}
5. DTO Layer Let's create DTO to transfer data between server to client and vice-versa.
UserLocationDTO package net.javaguides.springboot.dto;
import lombok.Data;
@Data
public class UserLocationDTO {
private long userId;
private String email;
private String place;
private double longitude;
private double latitude;
}
6. Service Layer Let's create Service class and keep entity to DTO conversion logic in Service class:
UserService package net.javaguides.springboot.service;
import net.javaguides.springboot.dto.UserLocationDTO;
import net.javaguides.springboot.model.User;
import net.javaguides.springboot.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
import java.util.stream.Collectors;
@Service
public class UserService {
@Autowired
private UserRepository userRepository;
public List<UserLocationDTO> getAllUsersLocation(){
return userRepository.findAll()
.stream()
.map(this::convertEntityToDto)
.collect(Collectors.toList());
}
private UserLocationDTO convertEntityToDto(User user){
UserLocationDTO userLocationDTO = new UserLocationDTO();
userLocationDTO.setUserId(user.getId());
userLocationDTO.setEmail(user.getEmail());
userLocationDTO.setPlace(user.getLocation().getPlace());
userLocationDTO.setLongitude(user.getLocation().getLongitude());
userLocationDTO.setLatitude(user.getLocation().getLatitude());
return userLocationDTO;
}
}
7. Controller Layer Let's create a Controller and expose a simple REST API which return list of DTO objects.
UserController package net.javaguides.springboot.controller;
import net.javaguides.springboot.dto.UserLocationDTO;
import net.javaguides.springboot.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@RestController
public class UserController {
@Autowired
private UserService userService;
@GetMapping("/users-location")
public List<UserLocationDTO> getAllUsersLocation(){
return userService.getAllUsersLocation();
}
}
8. Insert Data in DB Let's write a code to insert few records in H2 database:
package net.javaguides.springboot;
import net.javaguides.springboot.model.Location;
import net.javaguides.springboot.model.User;
import net.javaguides.springboot.repository.LocationRepository;
import net.javaguides.springboot.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
public class SpringbootDtoTutorialApplication implements CommandLineRunner {
public static void main(String[] args) {
SpringApplication.run(SpringbootDtoTutorialApplication.class, args);
}
@Autowired
private UserRepository userRepository;
@Autowired
private LocationRepository locationRepository;
@Override
public void run(String... args) throws Exception {
Location location = new Location();
location.setPlace("Pune");
location.setDescription("Pune is great place to live");
location.setLongitude(40.5);
location.setLatitude(30.6);
locationRepository.save(location);
User user1 = new User();
user1.setFirstName("Ramesh");
user1.setLastName("Fadatare");
user1.setEmail("ramesh@gmail.com");
user1.setPassword("secret");
user1.setLocation(location);
userRepository.save(user1);
User user2 = new User();
user2.setFirstName("John");
user2.setLastName("Cena");
user2.setEmail("john@gmail.com");
user2.setPassword("secret");
user2.setLocation(location);
userRepository.save(user2);
}
}
9. Run and Test Spring boot application Just go to the root directory of the application and type the following command to run it -
$ mvn spring-boot:run
The application will start at Spring Boot’s default tomcat port 8080 .
Hit below URL in browser to get response of the REST API:
http://localhost:8080/users-location
Conclusion In this tutorial, we have seen how to use DTO (Data Transfer Object) pattern in Spring Boot application.
DTO
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Spring Data JPA - delete() Method Example
Spring Data JPA - deleteAll() Method Example
Spring Data JPA - Distinct Query Method Example
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Spring Data JPA - LessThan Query Method Example
Spring Data JPA - Containing Query Method Example
Spring Data JPA - Like Query Method Example
Spring Data JPA - Between Query Method Example
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Unit Test Spring Boot GET REST API using JUnit and Mockito
Unit Test Spring Boot POST REST API using JUnit and Mockito
Unit Test Spring Boot PUT REST API using JUnit and Mockito
Unit Test Spring Boot DELETE REST API using JUnit and Mockito
Create REST Client using WebClient for Spring Boot CRUD REST API
Spring Boot WebClient GET Request with Parameters
Spring Boot WebClient POST Request Example
Spring Boot WebClient PUT Request Example
Spring Boot WebClient DELETE Request Example
Spring Boot RestClient GET Request Example
Spring Boot RestClient POST Request Example
Spring Boot RestClient PUT Request Example
Spring Boot RestClient Delete Request Example
Spring Core Annotations with Examples
Spring Boot @Component Example
Spring Boot @Autowired Example
Spring Boot @Qualifier Example
Spring Boot @Primary Example
Spring Boot @Bean Example
Spring Boot @Lazy Example
Spring Boot @Scope Example
Spring Boot @PropertySource Example
Spring Boot @Transactional Example
Spring Boot @Configuration Example
Spring Boot @ComponentScan Example
Spring Boot @Profile Example
Spring Boot @Cacheable Example
Spring Boot @DependsOn Example
Spring Boot @RestController Example
Spring Boot @ResponseBody Example
Spring Boot @GetMapping Example
Spring Boot @PostMapping Example
Spring Boot @PutMapping Example
Spring Boot @DeleteMapping Example
Spring Boot @PatchMapping Example
Spring Boot @PathVariable Example
Spring Boot @ResponseStatus Example
Spring Boot @Service Example
Spring Boot @Repository Example
Spring Boot @RequestParam Example
Spring Boot @SessionAttribute Example
Spring Boot @RequestBody Example
Spring Boot @ExceptionHandler Example
Spring Boot @InitBinder Example
Spring Boot @ModelAttribute Example
Spring Boot @RequestMapping Example
Spring Boot @CrossOrigin Example
Spring Boot @ControllerAdvice Example
Spring Boot @RestControllerAdvice Example
Spring Boot @SpringBootApplication Example
Spring Boot @EnableAutoConfiguration Example
Spring Boot @ConditionalOnClass Example
Spring Boot @SpringBootConfiguration Example
Spring Boot @ConditionalOnProperty Example
Spring Boot @ConditionalOnWebApplication Example
Spring Boot @ConfigurationProperties Example
Spring Boot @Async Example
Spring Boot @Scheduled Example
Spring Boot @SpringBootTest Example
Spring Boot @WebMvcTest Example
Spring Boot @DataJpaTest Example
Spring Boot @EnableDiscoveryClient Example
Spring Boot @EnableFeignClients Example
Spring Boot @RefreshScope Example
Spring Boot @LoadBalanced Example
Spring Boot @Query Example
Spring Boot @Modifying Example
Spring Boot @Param Example
Spring Boot JPA @Transient Example
Spring Boot JPA @Enumerated Example
Spring Boot JPA @Temporal Example
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Spring Boot @LastModifiedDate Example
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Spring Boot
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