In this previous example, we have seen how to use DTO in Spring boot application and we have written a code to manually convert Entity to DTO. In this example, we will see how to use ModelMapper library to automatically convert Entity to DTO and vice-versa.
Here are the simple steps to follow to use ModelMapper library in Spring boot application.
The source code of this tutorial available on our GitHub repository at https://github.com/RameshMF/springboot-dto-tutorial
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1. Add ModelMapper Dependency
Open pom.xml file and add the following ModelMapper dependency:
<!-- https://mvnrepository.com/artifact/org.modelmapper/modelmapper --> <dependency> <groupId>org.modelmapper</groupId> <artifactId>modelmapper</artifactId> <version>2.4.4</version> </dependency>
Here is the complete pom.xml for your reference:
<?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>
2. Configure ModelMapper as Spring Bean
Open Spring boot main application class and add the following ModelMapper bean configuration:
@Bean public ModelMapper modelMapper(){ return new ModelMapper(); }
Here is the complete code:
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.modelmapper.ModelMapper; 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 { @Bean public ModelMapper modelMapper(){ return new ModelMapper(); } 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); } }
3. Inject or Autowire ModelMapper Bean in Service Class
Let's inject or autowire ModelMapper bean to use it's methods:
@Autowired private UserRepository userRepository;
Here is the complete code:
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.modelmapper.ModelMapper; import org.modelmapper.convention.MatchingStrategies; 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; @Autowired private ModelMapper modelMapper; // .... }
4. Convert Entity to DTO and Vice-Versa using ModelMapper
private UserLocationDTO convertEntityToDto(User user){ modelMapper.getConfiguration() .setMatchingStrategy(MatchingStrategies.LOOSE); UserLocationDTO userLocationDTO = new UserLocationDTO(); userLocationDTO = modelMapper.map(user, UserLocationDTO.class); return userLocationDTO; } private User convertDtoToEntity(UserLocationDTO userLocationDTO){ modelMapper.getConfiguration() .setMatchingStrategy(MatchingStrategies.LOOSE); User user = new User(); user = modelMapper.map(userLocationDTO, User.class); return user; }
Here is the complete code:
private UserLocationDTO convertEntityToDto(User user){ modelMapper.getConfiguration() .setMatchingStrategy(MatchingStrategies.LOOSE); UserLocationDTO userLocationDTO = new UserLocationDTO(); userLocationDTO = modelMapper.map(user, UserLocationDTO.class); return userLocationDTO; } private User convertDtoToEntity(UserLocationDTO userLocationDTO){ modelMapper.getConfiguration() .setMatchingStrategy(MatchingStrategies.LOOSE); User user = new User(); user = modelMapper.map(userLocationDTO, User.class); return user; }
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 ModelMapper library to automatically convert Entity to DTO and vice-versa in Spring boot application.
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