This content originally appeared on DEV Community and was authored by Willian Ferreira Moya
This is a class-level annotation that is a specialization of @Component designed to handle business logic. It will turn your class into a Spring-managed bean.
Why is it important?
By using this annotation, you are implementing a separation of concerns by placing the business logic in a specific layer, thereby improving code readability.
How to use it?
First, define a class annotated with @Service that has some business logic in the methods:
package com.example.demo.service;
import org.springframework.stereotype.Service;
@Service
public class UserService {
public String getWelcomeMessage(String username) {
return "Welcome, " + username + "!";
}
}
Then inject your created service where it’s needed:
package com.example.demo.controller;
import com.example.demo.service.UserService;
import org.springframework.web.bind.annotation.*;
@RestController
@RequestMapping("/users")
public class UserController {
private final UserService userService;
public UserController(UserService userService) {
this.userService = userService;
}
@GetMapping("/{username}")
public String welcomeUser(@PathVariable String username) {
return userService.getWelcomeMessage(username);
}
}
Let’s test it
Let’s call our endpoint
curl http://localhost:8080/users/SpringMastery
The result should look like this:
Welcome, SpringMastery!
Conclusion
That’s it, it's that easy to create a service in your application. Now you know how, when to use, and how important this annotation is in your Spring applications.
Have you ever thought about the difference between @Service and @Component?
This content originally appeared on DEV Community and was authored by Willian Ferreira Moya
Willian Ferreira Moya | Sciencx (2025-09-10T16:00:00+00:00) What is @Service In Spring?. Retrieved from https://www.scien.cx/2025/09/10/what-is-service-in-spring/
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