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Hey guys in this article, you will learn about mapping the DTO to Entity class in Spring boot or Spring MVC.

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There are so many different ways to map the DTO to Entity or vice versa in spring boot, we can use Modelmapper, Mapstruct, Dozermapper.

Complete Example

Follow the complete article to learn about mapping the DTO to Entity object using Model mapper.

Create spring boot project

There are many different ways to create a spring boot application, you can follow the below articles to create one –

>> Create spring boot application using Spring initializer
>> Create spring boot application in Spring tool suite [STS]
>> Create spring boot application in IntelliJ IDEA

Add maven dependencies

Open pom.xml and add the following dependencies –

<?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>2.5.5</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>
	<groupId>in.bushansirgur</groupId>
	<artifactId>springbootapp</artifactId>
	<version>1.0.0</version>
	<name>springbootapp</name>
	<description>Spring boot app</description>
	<properties>
		<java.version>1.8</java.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		
		<dependency>
			<groupId>org.modelmapper</groupId>
			<artifactId>modelmapper</artifactId>
			<version>0.7.4</version>
		</dependency>
		
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

spring-boot-starter-web dependency for building web applications using Spring MVC. It uses the tomcat as the default embedded container. org.modelmapper dependency is for mapping the DTO to entity and entity to DTO using model mapper.

Create DTO class

Create EmployeeDTO.java inside in.bushansirgur.dto package and add the following content

package in.bushansirgur.springbootapp.entity;

public class EmployeeDTO {
	
private String name;
	
	private int age;
	
	private String location;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public String getLocation() {
		return location;
	}

	public void setLocation(String location) {
		this.location = location;
	}
	
}

Create Entity class

Create Employee.java inside in.bushansirgur.entity package and add the following content

package in.bushansirgur.springbootapp.entity;

public class Employee {
	
private String name;
	
	private int age;
	
	private String location;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public String getLocation() {
		return location;
	}

	public void setLocation(String location) {
		this.location = location;
	}

	@Override
	public String toString() {
		return "Employee [name=" + name + ", age=" + age + ", location=" + location + "]";
	}
	
}

Create a Controller

Create HomeController.java inside in.bushansirgur.controller package add the following content

package in.bushansirgur.springbootapp.controller;

import org.modelmapper.ModelMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

import in.bushansirgur.springbootapp.entity.Employee;
import in.bushansirgur.springbootapp.model.EmployeeDTO;

@RestController
public class HomeController {
	
	@Autowired
	private ModelMapper mapper;
	
	@PostMapping("/save")
	public Employee save(@RequestBody EmployeeDTO employeeDto) {
		Employee employee = mapper.map(employeeDto, Employee.class);
		System.out.println("Printing employee after mapping:"+employee);
		return employee;
	}
}

Run the app

Run the application using the below maven command –

mvn spring-boot:run

Open the browser and enter the following URL –

http://localhost:8080/save

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