Dependencies
Simple RESTful web service with Spring on port 9090.
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
Application
The service will handle GET requests and return JSON response.
/**
* Rest Controller service
*
* Use start.spring.io to create a new Spring Web project.
* The service will handle GET requests for /greeting and return JSON response.
*
* Use start.spring.io to create a new Spring Web project.
*/
package com.minte9.rest_service;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class App {
public static void main(String[] args) {
SpringApplication.run(App.class, args);
}
}
Resource
In Spring RESTful web services, HTTP requests are handled by a {{resource controller`
/**
* Resource Controller - GreetingController
*
* HTTP requests are handled by a controller
* Components are identified by the @RestController annotation.
*/
package com.minte9.rest_service;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class QuoteController {
@GetMapping("/")
public String quote() {
return "Welcome! <br><br>Use /quote/{id}";
}
@GetMapping("/quote/{id}")
public Quote getQuote(@PathVariable Integer id) {
List<Quote> quotes = Arrays.asList(
new Quote(1, "Spring Boot makes stand alone Spring apps easy."),
new Quote(2, "With Boot you deploy everywhere.")
);
quotes = quotes.stream()
.filter(x -> x.getId() == id)
.collect(Collectors.toList());
return quotes.get(0);
}
}
Model
To model the quote representation, create a resource representation class.
/**
* Resource Representation Class - Greeting
*/
package com.minte9.rest_service;
class Quote {
private final Integer id;
private final String content;
public Quote(Integer id, String content) {
this.id = id;
this.content = content;
}
public long getId() {
return id;
}
public String getContent() {
return content;
}
}
Port
You might want to set a different port from 8080 for you application.
# src/main/resources/application.properties
server.port=9090
Run
We can now build adn run the application and test the service.
mvn spring-boot:run
http://localhost:9090/quote/1 # {"id":1,"content":"Spring Boot ...
http://localhost:9090/quote/2 # {"id":2,"content":"With Boot you ...
Last update: 187 days ago
