MapStruct Explained | Java DTO Conversion & Mapping in Spring Boot

Java Spring Boot Interview Q27 !!

In this video, we explore how to use MapStruct in Spring Boot for DTO to DTO mapping. MapStruct makes it easy to convert and transform data between objects in a clean and efficient way, without writing boilerplate code.

We’ll walk through practical scenarios of DTO conversion using MapStruct annotations like @Mapper and @Mapping, including:

1) Mapping fields with different names between DTOs.
2) Ignoring fields during conversion.
3) Mapping fields with different datatypes.
4) Mapping only specific fields using @BeanMapping.
5) Combining multiple DTOs into one target DTO.
6) Setting default values when null is encountered.
7) Using the @Named annotation for custom mappings.

By the end of this video, you’ll understand how to apply @Mapper and @Mapping in real-world Spring Boot projects, follow DTO best practices, and make your code cleaner, faster, and easier to maintain.

00:00 : Introduction
01:14 : Code Walkthrough
05:16 : MapStruct Dependency
06:32 : Mapper Interface
10:00 : Mapping Fields with Different Names
12:14 : Mapping Fields with Different Datatypes
13:42 : Ignoring Particular Field
14:59 : Default values for null Fields
17:02 : Selective mapping (@BeanMapping)
19:03 : Multiple DTOs → One DTO
26:38 : Custom Mappings (@Named)

Spring Boot Basics to Know :

Spring Boot and Java Setup
https://www.youtube.com/watch?v=M7XhAj6E7xQ

Project Object Model File | Understanding pom.xml
https://www.youtube.com/watch?v=2RE-a74EQDk&t=10s

How to create an API ?
https://www.youtube.com/watch?v=3ruFGipx5JE&t=6s

How to Connect Spring Boot to a Database ?
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Видео MapStruct Explained | Java DTO Conversion & Mapping in Spring Boot канала The Curious Coder