Kotlin – How to build a SpringBoot Kotlin RESTful Web Service with @RestController

In the tutorial, JavaSampleApproach will show you the first step to build a SpringBoot Kotlin RESTful Web Service.

Related posts:
Kotlin – How to start Kotlin development with SpringBoot + Maven + SpringToolSuite
Kotlin Spring MVC RequestMapping RESTful APIs with @GetMapping, @PostMapping, @PutMapping, @DeleteMapping | SpringBoot Example

I. Technologies

– Java 1.8
– Maven 3.3.9
– Spring Tool Suite – Version 3.8.1.RELEASE
– SpringBoot – 1.5.6.RELEASE
– Kotlin 1.4

II. SpringBoot Kotlin RESTful Web Service

SpringBoot supports us a lots for build a RESTful Web Service with @RestController annotation:

[...]
@RestController
class KotlinRestController {
	...
}

For use it, we need a spring-boot-starter-web dependency.
By default, SpringBoot starts an embedded Tomcat container at port: 8080. We can use server.port in application.properties to change the default.

III. Practice

In the tutorial, we create a SpringBoot project as below image:

spring-kotlin-restful-api-project-structure.png

Step to do:
– Create SpringBoot project
– Create model data
– Create RestController
– Run and Check results

1. Create SpringBoot project

Using SpringToolSuite to create a SpringBoot project.

Then add needed dependency:


	org.springframework.boot
	spring-boot-starter-web

2. Create model data

– Create a Customer data model:

package com.javasampleapproach.restful.model

data class Customer(
		val firstName: String,
		val lastName: String,
		val age: Int) {
}
3. Create RestController

– Create a RestController:

package com.javasampleapproach.restful.controller

import com.javasampleapproach.restful.model.Customer
import org.springframework.web.bind.annotation.GetMapping
import org.springframework.web.bind.annotation.RestController

@RestController
class KotlinRestController {
	
	@GetMapping("/customer")
	fun getCustomer() = Customer("Jack", "Smith", 25)
}

Open application.properties file, we can modified Tomcat server port:

server.port=8081
4. Run and Check results

Build and Run the SpringBoot project as commandlines {mvn clean install, mvn spring-boot:run}.
Make a request http://localhost:8081/customer

spring-kotlin-restful-api-make-request

IV. Sourcecode

SpringKotlinRESTfulAPIs



By grokonez | August 28, 2017.


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